Linux kernel netfilter do_add_counters race condition
| linux-doaddcounters-race-condition (26583) |  Medium 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.
Platforms Affected:
- Canonical, Ubuntu 5.04
- Canonical, Ubuntu 5.10
- Canonical, Ubuntu 6.06 LTS
- Debian, Debian Linux 3.1
- 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
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.
Consequences:
Obtain Information
References:
- Gentoo Bugzilla Bug 133465, Kernel: netfilter do_add_counters race (CVE-2006-0039) at http://bugs.gentoo.org/show_bug.cgi?id=133465.
- Red Hat Bugzilla Bug 191698, CVE-2006-0039 netfilter do_add_counters race at https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=191698.
- The Linux Kernel Archives Web site, ChangeLog-2.6.16.17 at http://kernel.org/pub/linux/kernel/v2.6/ChangeLog-2.6.16.17.
- The Linux Kernel Archives Web site, The Linux Kernel Archives at http://kernel.org/.
- 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
Reported:
May 16, 2006
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