Linux kernel netfilter do_add_counters race condition

linux-doaddcounters-race-condition (26583) The risk level is classified as MediumMedium Risk

Description:

The Linux kernel netfilter module is vulnerable to a race condition in the do_add_counters() function. A local attacker with CAP-NET_ADMIN privileges could exploit this vulnerability to view portions of kernel memory.


Consequences:

Obtain Information

Remedy:

Upgrade to the latest version of Linux kernel (2.6.16.18 or later), available from The Linux Kernel Archives Web site. See References.

For Debian GNU/Linux:
Refer to DSA-1097-1 and DSA-1103-1 for patch, upgrade, or suggested workaround information. See References.

For Red Hat Linux 4:
Refer to RHSA-2006:0689-15 for patch, upgrade, or suggested workaround information. See References.

For Turbolinux:
Refer to Red Hat Linux Security Advisory TLSA-2007-2 for patch, upgrade, or suggested workaround information. See References.

References:

  • Gentoo Bugzilla Bug 133465: Kernel: netfilter do_add_counters race (CVE-2006-0039).
  • Red Hat Bugzilla Bug 191698: CVE-2006-0039 netfilter do_add_counters race.
  • The Linux Kernel Archives Web site: ChangeLog-2.6.16.17.
  • The Linux Kernel Archives Web site: The Linux Kernel Archives.
  • ASA-2006-249: kernel security update (RHSA-2006-0689)
  • BID-18113: Linux Kernel Netfilter Do_Add_Counters Local Race Condition Vulnerability
  • CVE-2006-0039: Race condition in the do_add_counters function in netfilter for Linux kernel 2.6.16 allows local users with CAP_NET_ADMIN capabilities to read kernel memory by triggering the race condition in a way that produces a size value that is inconsistent with allocated memory, which leads to a buffer over-read in IPT_ENTRY_ITERATE.
  • DSA-1097: kernel-source-2.4.27 -- several vulnerabilities
  • DSA-1103: kernel-source-2.6.8 -- several vulnerabilities
  • OSVDB ID: 25697: Linux Kernel Netfilter do_add_counters() Function Local Memory Disclosure
  • RHSA-2006-0689: kernel security update
  • SA20185: Linux Kernel Netfilter Weakness and Two SCTP Vulnerabilities
  • SA21476: Linux Kernel Multiple Vulnerabilities
  • SA22945: Avaya Products Linux Kernel Multiple Vulnerabilities

Platforms Affected:

  • Canonical Ubuntu 5.04
  • Canonical Ubuntu 5.10
  • Canonical Ubuntu 6.06 LTS
  • Debian Debian Linux 3.1
  • Linux Linux Kernel 2.6.16
  • RedHat Enterprise Linux 4 ES
  • RedHat Enterprise Linux 4 Desktop
  • RedHat Enterprise Linux 4 AS
  • RedHat Enterprise Linux 4 WS
  • Turbolinux Turbolinux 8 Server

Reported:

May 16, 2006

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