Input validation error in Linux kernel

1) Input validation error

EUVDB-ID: #VU43040

Risk: Medium

CVSSv3.1: 6.5 [CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2013-0228

CWE-ID: CWE-20 - Improper input validation

Exploit availability: No

Description

The vulnerability allows a remote non-authenticated attacker to execute arbitrary code.

The xen_iret function in arch/x86/xen/xen-asm_32.S in the Linux kernel before 3.7.9 on 32-bit Xen paravirt_ops platforms does not properly handle an invalid value in the DS segment register, which allows guest OS users to gain guest OS privileges via a crafted application.

Mitigation

Install update from vendor's website.

Vulnerable software versions

Linux kernel: 3.0 - 3.7.7

External links

http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=13d2b4d11d69a92574a55bfd985cfb0ca77aebdc
http://www.kernel.org/pub/linux/kernel/v3.x/ChangeLog-3.7.9
http://www.mandriva.com/security/advisories?name=MDVSA-2013:176
http://www.openwall.com/lists/oss-security/2013/02/13/10
http://www.ubuntu.com/usn/USN-1795-1
http://www.ubuntu.com/usn/USN-1796-1
http://www.ubuntu.com/usn/USN-1797-1
http://www.ubuntu.com/usn/USN-1805-1
http://www.ubuntu.com/usn/USN-1808-1
http://bugzilla.redhat.com/show_bug.cgi?id=906309
http://github.com/torvalds/linux/commit/13d2b4d11d69a92574a55bfd985cfb0ca77aebdc

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.