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CVE-2023-22742— libgit2 fails to verify SSH keys by default

Quick assessment

Affected
libgit2 libgit2
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

libgit2是一个可移植、使用C语言实现的Git核心开发包。 libgit2存在数据伪造问题漏洞，该漏洞源于默认情况下libgit2不执行证书检查。

CVSS 5.3 · Medium EPSS 0.58% · P46

Possible ATT&CK Techniques 1 AI

T1071 · Application Layer Protocol
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I. Basic Information for CVE-2023-22742

Vulnerability Information
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Vulnerability Title
libgit2 fails to verify SSH keys by default
Source: CVE Program / CVE List V5
Vulnerability Description
libgit2 is a cross-platform, linkable library implementation of Git. When using an SSH remote with the optional libssh2 backend, libgit2 does not perform certificate checking by default. 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. Users are encouraged to upgrade to v1.4.5 or v1.5.1. Users unable to upgrade should ensure that all relevant certificates are manually checked.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:H/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
密码学签名的验证不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
libgit2 数据伪造问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
libgit2是一个可移植、使用C语言实现的Git核心开发包。 libgit2存在数据伪造问题漏洞，该漏洞源于默认情况下libgit2不执行证书检查。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
libgit2 libgit2 < 1.4.5 -

II. Public POCs for CVE-2023-22742

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III. Intelligence Information for CVE-2023-22742

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Patches & Fixes for CVE-2023-22742 (2)

Vendor Advisories for CVE-2023-22742 (1)

Mailing List Discussions for CVE-2023-22742 (1)

Other References for CVE-2023-22742 (2)

IV. Related Vulnerabilities

Same product: libgit2
Same vendor: libgit2
Same weakness: CWE-347

V. Comments for CVE-2023-22742

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