Stack-based buffer overflow in ConnMan - CVE-2021-33833
Published: June 9, 2021 / Updated: September 19, 2022
Vulnerability identifier: #VU53998
CSH Severity: Medium
CVSS v4: 8.7 [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]
CVE-ID: CVE-2021-33833
CWE-ID: CWE-121
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
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.
Affected software
ConnMan
Arch Linux
Gentoo Linux
Ubuntu
connman (Ubuntu package)
Arch Linux
Gentoo Linux
Ubuntu
connman (Ubuntu package)
How to mitigate CVE-2021-33833
Install update from vendor's website.
ConnMan - update to 1.40
connman (Ubuntu package) - addressed in versions Ubuntu Pro, 1.36-2ubuntu0.1, 1.36-2.3ubuntu0.1, 1.41-2ubuntu0.23.04.1
connman (Ubuntu package) - addressed in versions Ubuntu Pro, 1.36-2ubuntu0.1, 1.36-2.3ubuntu0.1, 1.41-2ubuntu0.23.04.1