medium
5
CWE
20
Advisory Published
Updated

CVE-2011-4539: Input Validation

First published: Thu Dec 08 2011(Updated: )

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.

Credit: cve@mitre.org

Affected SoftwareAffected VersionHow to fix
ISC DHCP=4.0.2-b2
ISC DHCP=4.0.2-b3
ISC DHCP=4.2.2-rc1
ISC DHCP=4.2.2-b1
ISC DHCP=4.1.1-rc1
ISC DHCP=4.2.0-b2
ISC DHCP=4.0.2-b1
ISC DHCP=4.2.0-a2
ISC DHCP=4.0.1-rc1
ISC DHCP=4.2.0-b1
ISC DHCP=4.2.1-rc1
ISC DHCP=4.2.0-a1
ISC DHCP=4.0.1-b1
ISC DHCP=4.0.2-rc1
ISC DHCP=4.0.3-rc1
ISC DHCP=4.0.0
ISC DHCP=4.1.1-b3
ISC DHCP=4.0.3-b1
ISC DHCP=4.2.1-b1
ISC DHCP=4.2.0-rc1
ISC DHCP=4.0
ISC DHCP=4.2.0-p1
ISC DHCP=4.1.2
ISC DHCP=4.0.1
ISC DHCP=4.0.2
ISC DHCP=4.0.3
ISC DHCP=4.2.0
ISC DHCP=4.2.1
ISC DHCP=4.2.2
ISC DHCP=4.2.3
ISC DHCP=4.1-esv-r3_b1
ISC DHCP=4.1-esv-r3
ISC DHCP=4.1-esv-r2
ISC DHCP=4.1-esv-r1
ISC DHCP=4.1-esv
Ubuntu=11.04
Ubuntu=11.10
Debian Linux=7.0
Debian Linux=6.0

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Reference Links

Frequently Asked Questions

  • What is the severity of CVE-2011-4539?

    CVE-2011-4539 has been classified as a moderate severity vulnerability due to its potential to cause a denial of service.

  • How do I fix CVE-2011-4539?

    To fix CVE-2011-4539, upgrade to ISC DHCP version 4.2.3-P1 or 4.1-ESV-R4 or later.

  • Which versions of ISC DHCP are affected by CVE-2011-4539?

    CVE-2011-4539 affects ISC DHCP versions 4.0, 4.1-ESV up to 4.1-ESV-R3, and versions earlier than 4.2.3-P1.

  • What type of attack can exploit CVE-2011-4539?

    CVE-2011-4539 can be exploited by remote attackers to send crafted request packets that cause the DHCP daemon to crash.

  • Is CVE-2011-4539 related to DNS issues?

    No, CVE-2011-4539 specifically pertains to the DHCP daemon and its handling of regular expressions, not DNS.

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