#VU63956 Stack-based buffer overflow in cifs-utils - CVE-2022-27239

Vulnerability identifier: #VU63956

Vulnerability risk: Low

CVSSv4.0: 7.4 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H/E:U/U:Clear]

CVE-ID: CVE-2022-27239

CWE-ID: CWE-121

Exploitation vector: Local

Exploit availability: No

Vulnerable software:
cifs-utils
Server applications / Other server solutions

Vendor: Distrotech

Description

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

The vulnerability exists due to a boundary error when parsing the "mount.cifs ip=" command-line argument. A local user can pass specially crafted data to the command, trigger a stack-based buffer overflow and execute arbitrary code with root privileges.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

cifs-utils: 6.0 - 6.14

---

External links
https://wiki.robotz.com/index.php/Linux_CIFS_Utils_and_Samba
https://bugzilla.samba.org/show_bug.cgi?id=15025
https://bugzilla.suse.com/show_bug.cgi?id=1197216
https://github.com/piastry/cifs-utils/pull/7
https://github.com/piastry/cifs-utils/pull/7/commits/955fb147e97a6a74e1aaa65766de91e2c1479765
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/QIYZ4L6SLSYJQ446VJAO2VGAESURQNSP/
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/HXKZLJYJJEC3TIBFLXUORRMZUKG5W676/
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/5WBOLMANBYJILXQKRRK7OCR774PXJAYY/
https://lists.debian.org/debian-lts-announce/2022/05/msg00020.html

---

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.

Is there known malware, which exploits this vulnerability?

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