SB2010092205 - Privilege escalation in Linux kernel IA32

Description

This security bulletin contains information about 1 vulnerability.

1) Improper Privilege Management (CVE-ID: CVE-2010-3301)

CWE-ID: CWE-269 - Improper Privilege Management

CVSSv4: 8.5 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]

The vulnerability allows a local user to escalate privileges.

The vulnerability exists due to the IA32 system call emulation functionality in arch/x86/ia32/ia32entry.S  on the x86_64 platform does not zero extend the %eax register after the 32-bit entry path to ptrace is used. A local user can use the %rax register to escalate privileges on the system.

Note, the vulnerability exists due to a CVE-2007-4573 regression.

Remediation

Install update from vendor's website.

References

• http://www.kernel.org/pub/linux/kernel/v2.6/snapshots/patch-2.6.36-rc4-git2.log
• http://www.openwall.com/lists/oss-security/2010/09/16/3
• https://bugzilla.redhat.com/show_bug.cgi?id=634449
• http://sota.gen.nz/compat2/
• http://www.openwall.com/lists/oss-security/2010/09/16/1
• http://lists.opensuse.org/opensuse-security-announce/2010-09/msg00006.html
• http://www.mandriva.com/security/advisories?name=MDVSA-2010:198
• http://www.mandriva.com/security/advisories?name=MDVSA-2010:247
• http://www.redhat.com/support/errata/RHSA-2010-0842.html
• http://www.vupen.com/english/advisories/2010/3117
• http://www.ubuntu.com/usn/USN-1041-1
• http://secunia.com/advisories/42758
• http://www.vupen.com/english/advisories/2011/0070
• http://www.vupen.com/english/advisories/2011/0298
• http://lists.opensuse.org/opensuse-security-announce/2011-02/msg00000.html
• http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git%3Ba=commit%3Bh=36d001c70d8a0144ac1d038f6876c484849a74de
• http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git%3Ba=commit%3Bh=eefdca043e8391dcd719711716492063030b55ac