#VU50670 Stack-based buffer overflow in ConnMan - CVE-2021-26675

Vulnerability identifier: #VU50670

Vulnerability risk: High

CVSSv4.0: 6.3 [CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Amber]

CVE-ID: CVE-2021-26675

CWE-ID: CWE-121

Exploitation vector: Local network

Exploit availability: No

Vulnerable software:
ConnMan
Universal components / Libraries / Libraries used by multiple products

Vendor: kernel.org

Description

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

The vulnerability exists due to a boundary error within dnsproxy in ConnMan. A remote unauthenticated attacker on the local network can send specially crafted packets to the affected system, trigger a stack-based buffer overflow and execute arbitrary code on the target system.

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

Mitigation
Install updates from vendor's website.

Vulnerable software versions

ConnMan: 0.1 - 1.38

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External links
https://bugzilla.suse.com/show_bug.cgi?id=1181751
https://git.kernel.org/pub/scm/network/connman/connman.git/commit/?id=e4079a20f617a4b076af503f6e4e8b0304c9f2cb
https://git.kernel.org/pub/scm/network/connman/connman.git/tree/ChangeLog
https://lists.debian.org/debian-lts-announce/2021/02/msg00013.html
https://www.debian.org/security/2021/dsa-4847
https://www.openwall.com/lists/oss-security/2021/02/08/2

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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the local network (LAN).

Is there known malware, which exploits this vulnerability?

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