Citrix Xen up to 6.0.2 on 64-bit Kernel memory corruption

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4.0$0-$5k0.00

Summaryinfo

A vulnerability described as problematic has been identified in Citrix Xen up to 6.0.2 on 64-bit. Affected by this issue is some unknown functionality of the component Kernel. The manipulation results in memory corruption. This vulnerability is identified as CVE-2012-0217. The attack is only possible with local access. Additionally, an exploit exists. It is advisable to implement a patch to correct this issue.

Detailsinfo

A vulnerability, which was classified as problematic, was found in Citrix Xen up to 6.0.2 on 64-bit (Connectivity Software). Affected is an unknown code block of the component Kernel. The manipulation with an unknown input leads to a memory corruption vulnerability. CWE is classifying the issue as CWE-119. The product performs operations on a memory buffer, but it can read from or write to a memory location that is outside of the intended boundary of the buffer. This is going to have an impact on confidentiality, and integrity. CVE summarizes:

The x86-64 kernel system-call functionality in Xen 4.1.2 and earlier, as used in Citrix XenServer 6.0.2 and earlier and other products; Oracle Solaris 11 and earlier; illumos before r13724; Joyent SmartOS before 20120614T184600Z; FreeBSD before 9.0-RELEASE-p3; NetBSD 6.0 Beta and earlier; Microsoft Windows Server 2008 R2 and R2 SP1 and Windows 7 Gold and SP1; and possibly other operating systems, when running on an Intel processor, incorrectly uses the sysret path in cases where a certain address is not a canonical address, which allows local users to gain privileges via a crafted application. NOTE: because this issue is due to incorrect use of the Intel specification, it should have been split into separate identifiers; however, there was some value in preserving the original mapping of the multi-codebase coordinated-disclosure effort to a single identifier.

The bug was discovered 06/12/2012. The weakness was released 06/12/2012 by Rafal Wojtczuk with SuSE as Xen Security Advisory 7 as not defined advisory (Website). The advisory is shared for download at lists.xen.org. This vulnerability is traded as CVE-2012-0217 since 12/14/2011. The exploitability is told to be easy. The attack needs to be approached locally. The requirement for exploitation is a authentication. Technical details are unknown but a public exploit is available.

A public exploit has been developed in ANSI C. The exploit is shared for download at securityfocus.com. It is declared as proof-of-concept. The vulnerability scanner Nessus provides a plugin with the ID 74682 (openSUSE Security Update : xen (openSUSE-SU-2012:0886-1)), which helps to determine the existence of the flaw in a target environment. It is assigned to the family SuSE Local Security Checks and running in the context l. The commercial vulnerability scanner Qualys is able to test this issue with plugin 370050 (Citrix XenServer Security Update (CTX133161)).

Applying a patch is able to eliminate this problem. The bugfix is ready for download at support.citrix.com. A possible mitigation has been published immediately after the disclosure of the vulnerability.

The vulnerability is also documented in the databases at Exploit-DB (28718), Tenable (74682), SecurityFocus (BID 53856†), OSVDB (82943†) and Secunia (SA49381†). Entries connected to this vulnerability are available at VDB-5523, VDB-5525, VDB-5554 and VDB-5555. Once again VulDB remains the best source for vulnerability data.

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CVSSv4info

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CVSSv3info

VulDB Meta Base Score: 4.4
VulDB Meta Temp Score: 4.0

VulDB Base Score: 4.4
VulDB Temp Score: 4.0
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CVSSv2info

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Exploitinginfo

Class: Memory corruption
CWE: CWE-119
CAPEC: 🔍
ATT&CK: 🔍

Physical: Partially
Local: Yes
Remote: No

Availability: 🔍
Access: Public
Status: Proof-of-Concept
Programming Language: 🔍
Download: 🔍

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Nessus ID: 74682
Nessus Name: openSUSE Security Update : xen (openSUSE-SU-2012:0886-1)
Nessus File: 🔍
Nessus Risk: 🔍
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Nessus Port: 🔍

OpenVAS ID: 71479
OpenVAS Name: Debian Security Advisory DSA 2501-1 (xen)
OpenVAS File: 🔍
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Exploit-DB: 🔍

Threat Intelligenceinfo

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Countermeasuresinfo

Recommended: Patch
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Patch: support.citrix.com

Timelineinfo

12/14/2011 🔍
06/12/2012 +181 days 🔍
06/12/2012 +0 days 🔍
06/12/2012 +0 days 🔍
06/12/2012 +0 days 🔍
06/12/2012 +0 days 🔍
06/12/2012 +0 days 🔍
06/20/2012 +8 days 🔍
06/13/2014 +723 days 🔍
01/07/2025 +3861 days 🔍

Sourcesinfo

Vendor: citrix.com

Advisory: Xen Security Advisory 7
Researcher: Rafal Wojtczuk
Organization: SuSE
Status: Confirmed
Confirmation: 🔍

CVE: CVE-2012-0217 (🔍)
GCVE (CVE): GCVE-0-2012-0217
GCVE (VulDB): GCVE-100-5556

OVAL: 🔍

CERT: 🔍
SecurityFocus: 53856 - Intel CPU Hardware Local Privilege Escalation Vulnerability
Secunia: 49381
OSVDB: 82943 - Microsoft Windows User Mode Scheduler privilege escalation

scip Labs: https://www.scip.ch/en/?labs.20161013
See also: 🔍

Entryinfo

Created: 06/20/2012 11:27
Updated: 01/07/2025 20:43
Changes: 06/20/2012 11:27 (84), 07/30/2019 20:42 (4), 07/12/2024 18:57 (16), 01/07/2025 20:43 (3)
Complete: 🔍
Cache ID: 216:672:103

Once again VulDB remains the best source for vulnerability data.

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