Linux Foundation libvchan 4.2/4.3.0 XenStore Ring Index input validation

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5.2$0-$5k0.00

Summaryinfo

A vulnerability classified as problematic has been found in Linux Foundation libvchan 4.2/4.3.0. This vulnerability affects unknown code of the component XenStore Ring Index Handler. This manipulation causes input validation. This vulnerability is registered as CVE-2014-1896. No exploit is available. It is recommended to upgrade the affected component.

Detailsinfo

A vulnerability has been found in Linux Foundation libvchan 4.2/4.3.0 and classified as problematic. Affected by this vulnerability is some unknown processing of the component XenStore Ring Index Handler. The manipulation with an unknown input leads to a input validation vulnerability. The CWE definition for the vulnerability is CWE-20. The product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly. As an impact it is known to affect confidentiality, integrity, and availability. The summary by CVE is:

The (1) do_send and (2) do_recv functions in io.c in libvchan in Xen 4.2.x, 4.3.x, and 4.4-RC series allows local guests to cause a denial of service or possibly gain privileges via crafted xenstore ring indexes, which triggers a "read or write past the end of the ring."

The weakness was published 02/06/2014 by Marek Marczykowski-Gorecki as Xen Security Advisory CVE-2014-1896 / XSA-86 as confirmed advisory (Website). It is possible to read the advisory at xenbits.xenproject.org. The public release has been coordinated with Linux Foundation. This vulnerability is known as CVE-2014-1896 since 02/07/2014. The exploitation appears to be easy. Attacking locally is a requirement. The exploitation doesn't need any form of authentication. The technical details are unknown and an exploit is not publicly available.

The vulnerability scanner Nessus provides a plugin with the ID 72539 (Fedora 20 : xen-4.3.1-9.fc20 (2014-2170)), which helps to determine the existence of the flaw in a target environment. It is assigned to the family Fedora Local Security Checks. The commercial vulnerability scanner Qualys is able to test this issue with plugin 166935 (OpenSuSE Security Update for xen (openSUSE-SU-2014:0483-1)).

Upgrading eliminates this vulnerability. Applying the patch xsa86.patch is able to eliminate this problem. The bugfix is ready for download at xenbits.xenproject.org. The best possible mitigation is suggested to be upgrading to the latest version.

The vulnerability is also documented in the databases at X-Force (91004), Tenable (72539), SecurityFocus (BID 65424†), Secunia (SA56840†) and Vulnerability Center (SBV-43679†). Similar entries are available at VDB-11164, VDB-12064, VDB-12208 and VDB-12236. Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

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CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
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CVSSv3info

VulDB Meta Base Score: 5.9
VulDB Meta Temp Score: 5.2

VulDB Base Score: 5.9
VulDB Temp Score: 5.2
VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv2info

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VulDB Base Score: 🔍
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Exploitinginfo

Class: Input validation
CWE: CWE-20
CAPEC: 🔍
ATT&CK: 🔍

Physical: Partially
Local: Yes
Remote: Partially

Availability: 🔍
Status: Unproven

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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Nessus ID: 72539
Nessus Name: Fedora 20 : xen-4.3.1-9.fc20 (2014-2170)
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍

OpenVAS ID: 867511
OpenVAS Name: Fedora Update for xen FEDORA-2014-2170
OpenVAS File: 🔍
OpenVAS Family: 🔍

Qualys ID: 🔍
Qualys Name: 🔍

Threat Intelligenceinfo

Interest: 🔍
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Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔍

Patch: xsa86.patch

Timelineinfo

02/06/2014 🔍
02/06/2014 +0 days 🔍
02/06/2014 +0 days 🔍
02/07/2014 +1 days 🔍
02/07/2014 +0 days 🔍
02/12/2014 +5 days 🔍
03/19/2014 +35 days 🔍
04/01/2014 +13 days 🔍
06/09/2021 +2626 days 🔍

Sourcesinfo

Vendor: linuxfoundation.org

Advisory: Xen Security Advisory CVE-2014-1896 / XSA-86
Researcher: Marek Marczykowski-Gorecki
Status: Confirmed
Confirmation: 🔍
Coordinated: 🔍

CVE: CVE-2014-1896 (🔍)
GCVE (CVE): GCVE-0-2014-1896
GCVE (VulDB): GCVE-100-12235

OVAL: 🔍

X-Force: 91004 - Xen libvchan buffer overflow, Medium Risk
SecurityFocus: 65424 - Xen libvchan Xenstore Ring Indexes Local Privilege Escalation Vulnerability
Secunia: 56840 - Xen libvchan Xenstore Ring Indexes Buffer Overflow Vulnerability, Not Critical
Vulnerability Center: 43679 - Xen 4.2, 4.3 Local Code Execution Vulnerability in Libvchan via Crafted Xenstore Ring, Medium

See also: 🔍

Entryinfo

Created: 02/12/2014 14:00
Updated: 06/09/2021 09:00
Changes: 02/12/2014 14:00 (84), 05/23/2017 08:55 (1), 06/09/2021 09:00 (3)
Complete: 🔍
Committer:
Cache ID: 216:49F:103

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