SB2023082602 - Debian update for git

Description

This security bulletin contains information about 6 secuirty vulnerabilities.

1) Integer overflow (CVE-ID: CVE-2022-23521)

The vulnerability allows a remote attacker to compromise the affected system.

The vulnerability exists due to insufficient validation of user-supplied input when parsing the .gitattributes attributes. A remote attacker can trick the victim into cloning a specially crafted repository and execute arbitrary code on the system.

2) Untrusted search path (CVE-ID: CVE-2022-24765)

The vulnerability allows a local user to escalate privileges on the system.

The vulnerability exists due to application uses by default the C:\.git folder. A local user with ability to write files into the said directory can place a malicious file into it and execute it with elevated privileges.

Users of the Microsoft fork of Git are vulnerable simply by starting a Git Bash.

3) Permissions, Privileges, and Access Controls (CVE-ID: CVE-2022-29187)

The vulnerability allows a remote user to escalate privileges on the system.

The vulnerability exists due to application does not properly impose security restrictions. A remote user can bypass implemented security restrictions and privilege escalation on the system when navigating as root into a shared tmp directory owned by the victim, but where an attacker can create a git repository.

4) Input validation error (CVE-ID: CVE-2022-39253)

The vulnerability allows a remote attacker to bypass certain security restrictions.

The vulnerability exists due to the way Git handles hardlinks when performing a local clone. A remote attacker can trick the victim into clocking a malicious repository and create or copy hardlinks to critical files on the system, which can result in sensitive information exposure.

5) Heap-based buffer overflow (CVE-ID: CVE-2022-39260)

The vulnerability allows a remote attacker to execute arbitrary code on the target system.

The vulnerability exists due to a boundary error in the "git shell" command when handling untrusted input. A remote attacker can trick the victim to execute the affected command against a malicious repository, trigger a heap-based buffer overflow and execute arbitrary code on the target system.

Successful exploitation of this vulnerability may result in complete compromise of vulnerable system.

6) Heap-based buffer overflow (CVE-ID: CVE-2022-41903)

The vulnerability allows a remote attacker to execute arbitrary code on the target system.

The vulnerability exists due to a boundary error during git archive invocation. A remote attacker can trick the victim into using the application against a specially crafted archive, trigger a heap-based buffer overflow and execute arbitrary code on the target system.

Successful exploitation of this vulnerability may result in complete compromise of vulnerable system.

Remediation

Install update from vendor's website.

References

• https://www.debian.org/security/2023/dsa-5332