Denial of service in ConnMan dnsproxy

1) Stack-based buffer overflow

EUVDB-ID: #VU53998

Risk: Medium

CVSSv3.1: 6.9 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:U/RL:U/RC:C]

CVE-ID: CVE-2021-33833

CWE-ID: CWE-121 - Stack-based buffer overflow

Exploit availability: No

Description

The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to a boundary error within the dnsproxy  component in the uncompress function when unpacking NAME and RDATA/RDLENGTH fields with TYPE A/AAAA. A remote attacker can send specially crafted DNS packet to the ConnMan and perform a denial of service (DoS) attack.

Mitigation

Install update from vendor's website.

Vulnerable software versions

ConnMan: 1.32 - 1.39

CPE2.3

• cpe:2.3:a:kernel_org:connman:1.32:*:*:*:*:*:*:
• cpe:2.3:a:kernel_org:connman:1.33:*:*:*:*:*:*:
• cpe:2.3:a:kernel_org:connman:1.34:*:*:*:*:*:*:

External links

http://seclists.org/oss-sec/2021/q2/196

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

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