Resource management error in Unbound - CVE-2011-4869
Published: December 20, 2011 / Updated: August 11, 2020
Vulnerability identifier: #VU44440
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-2011-4869
CWE-ID: CWE-399
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote non-authenticated attacker to perform a denial of service (DoS) attack.
validator/val_nsec3.c in Unbound before 1.4.13p2 does not properly perform proof processing for NSEC3-signed zones, which allows remote DNS servers to cause a denial of service (daemon crash) via a malformed response that lacks expected NSEC3 records, a different vulnerability than CVE-2011-4528.
Affected software
Unbound
Gentoo Linux
Fedora
unbound
Gentoo Linux
Fedora
unbound
How to mitigate CVE-2011-4869
Install update from vendor's website.
unbound - addressed in versions 1.4.14-1.el5, 1.4.14-1.el6
External References
- http://lists.fedoraproject.org/pipermail/package-announce/2012-January/071525.html
- http://lists.fedoraproject.org/pipermail/package-announce/2012-January/071535.html
- http://osvdb.org/77910
- http://secunia.com/advisories/47326
- http://unbound.nlnetlabs.nl/downloads/CVE-2011-4528.txt
- http://www.debian.org/security/2011/dsa-2370
- http://www.kb.cert.org/vuls/id/209659
- https://exchange.xforce.ibmcloud.com/vulnerabilities/71868