MitM attack in libgit2
| Risk | Low |
| Patch available | YES |
| Number of vulnerabilities | 1 |
| CVE-ID | CVE-2023-22742 |
| CWE-ID | CWE-16 |
| Exploitation vector | Network |
| Public exploit | N/A |
| Vulnerable software Subscribe |
libgit2 Universal components / Libraries / Libraries used by multiple products |
| Vendor | libgit2.github.com |
Security Bulletin
This security bulletin contains one low risk vulnerability.
1) Configuration
EUVDB-ID: #VU71412
Risk: Low
CVSSv3.1: 3.7 [CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:L/A:N/E:U/RL:O/RC:C]
CVE-ID: CVE-2023-22742
CWE-ID:
CWE-16 - Configuration
Exploit availability: No
DescriptionThe vulnerability allows a remote attacker to perform MitM attack.
The vulnerability exists due to missing certificate validation in libgit2, when compiled using the optional, included libssh2 backend. Prior versions of libgit2 require the caller to set the certificate_check field of libgit2's git_remote_callbacks structure - if a certificate check callback is not set, libgit2 does not perform any certificate checking. This means that by default - without configuring a certificate check callback, clients will not perform validation on the server SSH keys and may be subject to a man-in-the-middle attack.
MitigationInstall updates from vendor's website.
Vulnerable software versionslibgit2: 1.4.0 - 1.5.0
External linkshttp://github.com/libgit2/libgit2/releases/tag/v1.4.5
http://github.com/libgit2/libgit2/releases/tag/v1.5.1
http://github.com/libgit2/libgit2/security/advisories/GHSA-8643-3wh5-rmjq
Q & A
Can this vulnerability be exploited remotely?
Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.
Is there known malware, which exploits this vulnerability?
No. We are not aware of malware exploiting this vulnerability.
