Fedora 33 update for squashfs-tools

1) Path traversal

EUVDB-ID: #VU56306

Risk: Medium

CVSSv4.0: 6.2 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2021-40153

CWE-ID: CWE-22 - Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')

Exploit availability: No

Description

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

The vulnerability exists due to input validation error when processing directory traversal sequences within the squashfs_opendir in unsquash-1.c. A remote user can store the filename in the directory entry, which later is used by unsquashfs to create the new file during the unsquash. As a result, it is possible to write files to locations outside of the destination.

Mitigation

Install updates from vendor's repository.

Vulnerable software versions

Fedora: 33

squashfs-tools: before 4.5-3.20210913gite048580.fc33

CPE2.3

• cpe:2.3:o:fedoraproject:fedora:33:*:*:*:*:*:*:*
• cpe:2.3:a:fedoraproject:squashfs-tools:*:*:*:*:*:fedora:*:*

External links

https://bodhi.fedoraproject.org/updates/FEDORA-2021-9fb6da134f

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote authenticated user via the Internet.

Is there known malware, which exploits this vulnerability?

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