Denial of service in ConnMan dnsproxy

1) Stack-based buffer overflow

EUVDB-ID: #VU53998

Risk: Medium

CVSSv4.0: 6.6 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green]

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

https://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.