Input validation error in MaraDNS - CVE-2011-5055
Published: January 8, 2012 / Updated: August 11, 2020
Vulnerability identifier: #VU44410
CSH Severity: Medium
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:U/U:Green
CVE-ID: CVE-2011-5055
CWE-ID: CWE-20
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: Sam Trenholme
Affected software:
MaraDNS
MaraDNS
Detailed vulnerability description
The vulnerability allows a remote non-authenticated attacker to perform service disruption.
MaraDNS 1.3.07.12 and 1.4.08 computes hash values for DNS data without properly restricting the ability to trigger hash collisions predictably, which allows remote attackers to cause a denial of service (CPU consumption) by sending many crafted queries with the Recursion Desired (RD) bit set. NOTE: this issue exists because of an incomplete fix for CVE-2012-0024.
How to mitigate CVE-2011-5055
Install update from vendor's website.