SB2011120802 - Input validation error in ISC Dhcp
Published: December 8, 2011 Updated: July 28, 2020
Security Bulletin ID
SB2011120802
CSH Severity
Medium
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Remote access
Highest impact
Partial DoS
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 vulnerability.
1) Input validation error (CVE-ID: CVE-2011-4539)
CWE-ID: CWE-20 - Improper input validation
CVSSv4: 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
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.
Remediation
Install update from vendor's website.
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