OpenBSD DHCP cons_options() buffer overflow
| openbsd-dhcp-bo (37045) |  High 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.
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 AS
- RedHat, Enterprise Linux 2.1 ES
- RedHat, Linux Advanced Workstation 2.1 Itanium
- Sun, OpenSolaris build_snv_01 SPARC
- Sun, OpenSolaris build_snv_01 x86
- Sun, OpenSolaris build_snv_02 SPARC
- Sun, OpenSolaris build_snv_02 x86
- Sun, OpenSolaris build_snv_100 x86
- Sun, OpenSolaris build_snv_100 SPARC
- Sun, OpenSolaris build_snv_101 x86
- Sun, OpenSolaris build_snv_101 SPARC
- Sun, OpenSolaris build_snv_102 x86
- Sun, OpenSolaris build_snv_102 SPARC
- Sun, OpenSolaris build_snv_12 x86
- Sun, OpenSolaris build_snv_13 SPARC
- Sun, OpenSolaris build_snv_13 x86
- Sun, OpenSolaris build_snv_19 x86
- Sun, OpenSolaris build_snv_19 SPARC
- 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 x86
- Sun, OpenSolaris build_snv_39 SPARC
- Sun, OpenSolaris build_snv_59 SPARC
- Sun, OpenSolaris build_snv_59 x86
- Sun, OpenSolaris build_snv_64 SPARC
- Sun, OpenSolaris build_snv_64 x86
- 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 SPARC
- Sun, OpenSolaris build_snv_85 x86
- 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 x86
- Sun, OpenSolaris build_snv_89 SPARC
- Sun, OpenSolaris build_snv_91 SPARC
- Sun, OpenSolaris build_snv_91 x86
- Sun, OpenSolaris build_snv_92 x86
- Sun, OpenSolaris build_snv_92 SPARC
- Sun, OpenSolaris build_snv_95 SPARC
- Sun, OpenSolaris build_snv_95 x86
- Sun, Solaris 10 SPARC
- Sun, Solaris 10 x86
- Sun, Solaris 8 SPARC
- Sun, Solaris 8 x86
- Sun, Solaris 9 x86
- Sun, Solaris 9 SPARC
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.
Consequences:
Gain Access
References:
- CORE-2007-0928, Stack-based buffer overflow vulnerability in OpenBSD's DHCP server at http://www.coresecurity.com/index.php5?module=ContentMod&action=item&id=1962.
- Full-Disclosure Mailing List, Fri Nov 02 2007 - 16:06:07 CDT, DoS Exploit for DHCPd bug (Bugtraq ID 25984 ; CVE-2007-5365) at http://archives.neohapsis.com/archives/fulldisclosure/2007-11/0086.html.
- OpenBSD 4.0 errata, 016: SECURITY FIX: October 8, 2007 at http://www.openbsd.org/errata40.html#016_file.
- OpenBSD 4.1 errata, 010: SECURITY FIX: October 8, 2007 at http://www.openbsd.org/errata41.html#010_file.
- OpenBSD 4.2 errata, 001: SECURITY FIX: October 8, 2007 at http://www.openbsd.org/errata42.html#001_file.
- 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 at http://sunsolve.sun.com/search/document.do?assetkey=1-66-243806-1.
- 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
Reported:
Oct 09, 2007
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