Denial of service in Libarchive

1) Race condition

EUVDB-ID: #VU96964

Risk: Low

CVSSv4.0: 0.4 [CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:N/VI:L/VA:L/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2023-30571

CWE-ID: CWE-362 - Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')

Exploit availability: No

Description

The vulnerability allows a local user to perform a denial of service (DoS) attack.

The vulnerability exists due to a race condition due to the umask() call inside archive_write_disk_posix.c changes the umask of the whole process for a very short period of time. Such a race condition could lead to implicit directory creation with permissions 0777 (without the sticky bit), which means that any low-privileged local user can delete and rename files inside those directories.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

libarchive: 3.0 - 3.7.1

CPE2.3

• cpe:2.3:a:libarchive:libarchive:3.0:*:*:*:*:*:*:*
• cpe:2.3:a:libarchive:libarchive:3.0.0:*:*:*:*:*:*:*
• cpe:2.3:a:libarchive:libarchive:3.0.1:*:*:*:*:*:*:*

External links

https://github.com/libarchive/libarchive/issues/1876
https://github.com/NixOS/nixpkgs/pull/244713

Q & A

Can this vulnerability be exploited remotely?

No. This vulnerability can be exploited locally. The attacker should have authentication credentials and successfully authenticate on the system.

How the attacker can exploit this vulnerability?

The attacker would have to trick the victim to open a a specially crafted archive.

The attacker would have to login to the system and perform certain actions in order to exploit this vulnerability.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.