Input validation error in DHCP - CVE-2011-4539
Published: December 8, 2011 / Updated: July 28, 2020
Vulnerability identifier: #VU32838
CSH Severity: Medium
CVSS v4: 6.9 [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]
CVE-ID: CVE-2011-4539
CWE-ID: CWE-20
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote non-authenticated attacker to perform service disruption.
dhcpd in ISC DHCP 4.x before 4.2.3-P1 and 4.1-ESV before 4.1-ESV-R4 does not properly handle regular expressions in dhcpd.conf, which allows remote attackers to cause a denial of service (daemon crash) via a crafted request packet.
Affected software
DHCP
Amazon Linux AMI
Slackware Linux
dhcp (Alpine package)
Amazon Linux AMI
Slackware Linux
dhcp (Alpine package)
How to mitigate CVE-2011-4539
Install update from vendor's website.
dhcp (Alpine package) - update to 4.2.3_p1-r0
External References
- http://lists.fedoraproject.org/pipermail/package-announce/2011-December/070980.html
- http://lists.fedoraproject.org/pipermail/package-announce/2012-January/071549.html
- http://lists.opensuse.org/opensuse-updates/2011-12/msg00006.html
- http://secunia.com/advisories/47153
- http://secunia.com/advisories/47178
- http://security.gentoo.org/glsa/glsa-201301-06.xml
- http://www.debian.org/security/2012/dsa-2519
- http://www.mandriva.com/security/advisories?name=MDVSA-2011:182
- http://www.securityfocus.com/bid/50971
- http://www.securitytracker.com/id?1026393
- http://www.ubuntu.com/usn/USN-1309-1
- https://exchange.xforce.ibmcloud.com/vulnerabilities/71680
- https://www.isc.org/software/dhcp/advisories/cve-2011-4539