OpenBSD DHCP cons_options() buffer overflow

openbsd-dhcp-bo (37045) The risk level is classified as HighHigh Risk

Description:

The DHCP daemon (dhcpd) used in OpenBSD and other BSD and Linux-based operating systems is vulnerable to a stack-based buffer overflow, caused by improper handling of DHCP requests by the cons_options() function in options.c. By sending a specially-crafted DHCP request that specifies a maximum message size that is less than the minimum IP MTU, a remote attacker could overflow a buffer and execute arbitrary code on the system or cause the server to crash.

*CVSS:

Base Score: 7.5
  Access Vector: Network
  Access Complexity: Low
  Authentication: None
  Confidentiality Impact: Partial
  Integrity Impact: Partial
  Availability Impact: Partial
 
Temporal Score: 5.9
  Exploitability: Proof-of-Concept
  Remediation Level: Official-Fix
  Report Confidence: Confirmed

Consequences:

Gain Access

Remedy:

For OpenBSD version 4.1:
Apply the patch for this vulnerability (010_dhcpd.patch), as listed in the OpenBSD 4.1 errata. See References.

For OpenBSD version 4.2:
Apply the patch for this vulnerability (001_dhcpd.patch), as listed in the OpenBSD 4.2 errata. See References.

For OpenBSD version 4.0:
Apply the patch for this vulnerability (016_dhcpd.patch), as listed in the OpenBSD 4.0 errata. See References.

For other distributions:
Apply the appropriate update for your system. See References.

References:

  • CORE-2007-0928: Stack-based buffer overflow vulnerability in OpenBSD's DHCP server.
  • Full-Disclosure Mailing List, Fri Nov 02 2007 - 16:06:07 CDT: DoS Exploit for DHCPd bug (Bugtraq ID 25984 ; CVE-2007-5365).
  • OpenBSD 4.0 errata: 016: SECURITY FIX: October 8, 2007.
  • OpenBSD 4.1 errata: 010: SECURITY FIX: October 8, 2007.
  • OpenBSD 4.2 errata: 001: SECURITY FIX: October 8, 2007.
  • Sun Alert ID: 243806: Security Vulnerabilities in DHCP Handling of DHCP Requests May Allow Remote Users to Execute Arbitrary Code or Cause a Denial of the DHCP Service .
  • ASA-2007-462: dhcp security update (RHSA-2007-0970)
  • ASA-2008-443: Security Vulnerabilities in DHCP Handling of DHCP Requests May Allow Remote Users to Execute Arbitrary Code or Cause a Denial of the DHCP Service (Sun 243806)
  • BID-25984: ISC DHCPD Server Remote Stack Corruption Vulnerability
  • BID-32213: Sun Solaris DHCP Denial of Service And Remote Code Execution Vulnerabilities
  • CVE-2007-5365: Stack-based buffer overflow in the cons_options function in options.c in dhcpd in OpenBSD 4.0 through 4.2, and some other dhcpd implementations based on ISC dhcp-2, allows remote attackers to execute arbitrary code or cause a denial of service (daemon crash) via a DHCP request specifying a maximum message size smaller than the minimum IP MTU.
  • DSA-1388: dhcp -- buffer overflow
  • RHSA-2007-0970: Important: dhcp security update
  • SA27160: OpenBSD dhcpd Buffer Overflow Vulnerability
  • SA32668: Sun Solaris DHCP Request Handling Vulnerabilities
  • SECTRACK ID: 1018794: OpenBSD dhcpcd Buffer Overflow Lets Remote Users Execute Arbitrary Code
  • SECTRACK ID: 1021157: Solaris DHCP Daemon Bug Lets Remote Users Deny Service
  • USN-531-1: dhcp vulnerability
  • USN-531-2: dhcp vulnerability
  • VUPEN/ADV-2008-3088: Sun Solaris DHCP Buffer Overflow and Denial of Service Vulnerabilities

Platforms Affected:

  • Canonical Ubuntu 6.06 LTS
  • Canonical Ubuntu 6.10
  • Canonical Ubuntu 7.04
  • Canonical Ubuntu 7.10
  • Debian Debian Linux 3.1
  • Debian Debian Linux 4.0
  • OpenBSD OpenBSD 4.0
  • OpenBSD OpenBSD 4.1
  • OpenBSD OpenBSD 4.2
  • RedHat Enterprise Linux 2.1 ES
  • RedHat Enterprise Linux 2.1 AS
  • RedHat Linux Advanced Workstation 2.1 Itanium
  • Sun OpenSolaris build_snv_01 x86
  • Sun OpenSolaris build_snv_01 SPARC
  • Sun OpenSolaris build_snv_02 SPARC
  • Sun OpenSolaris build_snv_02 x86
  • Sun OpenSolaris build_snv_100 SPARC
  • Sun OpenSolaris build_snv_100 x86
  • Sun OpenSolaris build_snv_101 SPARC
  • Sun OpenSolaris build_snv_101 x86
  • Sun OpenSolaris build_snv_102 x86
  • Sun OpenSolaris build_snv_102 SPARC
  • Sun OpenSolaris build_snv_12 x86
  • Sun OpenSolaris build_snv_13 x86
  • Sun OpenSolaris build_snv_13 SPARC
  • Sun OpenSolaris build_snv_19 SPARC
  • Sun OpenSolaris build_snv_19 x86
  • Sun OpenSolaris build_snv_22 x86
  • Sun OpenSolaris build_snv_22 SPARC
  • Sun OpenSolaris build_snv_36 x86
  • Sun OpenSolaris build_snv_36 SPARC
  • Sun OpenSolaris build_snv_39 SPARC
  • Sun OpenSolaris build_snv_39 x86
  • Sun OpenSolaris build_snv_59 SPARC
  • Sun OpenSolaris build_snv_59 x86
  • Sun OpenSolaris build_snv_64 x86
  • Sun OpenSolaris build_snv_64 SPARC
  • Sun OpenSolaris build_snv_67 x86
  • Sun OpenSolaris build_snv_67 SPARC
  • Sun OpenSolaris build_snv_68 x86
  • Sun OpenSolaris build_snv_68 SPARC
  • Sun OpenSolaris build_snv_80 SPARC
  • Sun OpenSolaris build_snv_85 x86
  • Sun OpenSolaris build_snv_85 SPARC
  • Sun OpenSolaris build_snv_87 SPARC
  • Sun OpenSolaris build_snv_87 x86
  • Sun OpenSolaris build_snv_88 x86
  • Sun OpenSolaris build_snv_88 SPARC
  • Sun OpenSolaris build_snv_89 SPARC
  • Sun OpenSolaris build_snv_89 x86
  • Sun OpenSolaris build_snv_91 SPARC
  • Sun OpenSolaris build_snv_91 x86
  • Sun OpenSolaris build_snv_92 SPARC
  • Sun OpenSolaris build_snv_92 x86
  • Sun OpenSolaris build_snv_95 SPARC
  • Sun OpenSolaris build_snv_95 x86
  • Sun Solaris 10 x86
  • Sun Solaris 10 SPARC
  • Sun Solaris 8 SPARC
  • Sun Solaris 8 x86
  • Sun Solaris 9 SPARC
  • Sun Solaris 9 x86

Reported:

Oct 09, 2007

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