XenSource Xen 4.3.x/4.4.x/4.5.x/4.6.x on x86/ARM libxl resource management

CVSS Meta Temp Score
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CTI Interest Score
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5.1$0-$5k0.00

Summaryinfo

A vulnerability has been found in XenSource Xen 4.3.x/4.4.x/4.5.x/4.6.x on x86/ARM and classified as problematic. This affects an unknown function of the component libxl. This manipulation causes resource management. This vulnerability is tracked as CVE-2015-8341. No exploit exists. To fix this issue, it is recommended to deploy a patch.

Detailsinfo

A vulnerability was found in XenSource Xen 4.3.x/4.4.x/4.5.x/4.6.x on x86/ARM (Virtualization Software). It has been declared as problematic. Affected by this vulnerability is an unknown part of the component libxl. The manipulation with an unknown input leads to a resource management vulnerability. The CWE definition for the vulnerability is CWE-399. As an impact it is known to affect availability.

The weakness was disclosed 12/08/2015 by George Dunlap with Citrix as XSA-160 as confirmed security advisory (Website). It is possible to read the advisory at xenbits.xen.org. This vulnerability is known as CVE-2015-8341 since 11/25/2015. The exploitation appears to be easy. The attack can be launched remotely. The exploitation doesn't need any form of authentication. The technical details are unknown and an exploit is not publicly available. The advisory points out:

For toolstacks which manage multiple domains within the same process, an attacker who is able to repeatedly start a suitable domain (or many such domains) can cause an out-of-memory condition in the toolstack process, leading to a denial of service. Under the same circumstances an attacker can also cause files to accumulate on the toolstack domain filesystem (usually under /var in dom0) used to temporarily store the kernel and initial ramdisk, perhaps leading to a denial of service against arbitrary other services using that filesystem.

The vulnerability scanner Nessus provides a plugin with the ID 87745 (FreeBSD : xen-tools -- libxl leak of pv kernel and initrd on error (5d1d4473-b40d-11e5-9728-002590263bf5)), which helps to determine the existence of the flaw in a target environment. It is assigned to the family FreeBSD Local Security Checks and running in the context l. The commercial vulnerability scanner Qualys is able to test this issue with plugin 168293 (SUSE Enterprise Linux Security update for xen (SUSE-SU-2015:2326-1)).

Applying a patch is able to eliminate this problem. A possible mitigation has been published immediately after the disclosure of the vulnerability.

The vulnerability is also documented in the databases at Tenable (87745), SecurityFocus (BID 79036†), SecurityTracker (ID 1034389†) and Vulnerability Center (SBV-55329†). The entry VDB-78017 is pretty similar. Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

Productinfo

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CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 5.3
VulDB Meta Temp Score: 5.1

VulDB Base Score: 5.3
VulDB Temp Score: 5.1
VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv2info

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VulDB Base Score: 🔍
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Exploitinginfo

Class: Resource management
CWE: CWE-399 / CWE-404
CAPEC: 🔍
ATT&CK: 🔍

Physical: No
Local: No
Remote: Yes

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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Nessus ID: 87745
Nessus Name: FreeBSD : xen-tools -- libxl leak of pv kernel and initrd on error (5d1d4473-b40d-11e5-9728-002590263bf5)
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Context: 🔍

OpenVAS ID: 867773
OpenVAS Name: Fedora Update for xen FEDORA-2015-08
OpenVAS File: 🔍
OpenVAS Family: 🔍

Qualys ID: 🔍
Qualys Name: 🔍

Threat Intelligenceinfo

Interest: 🔍
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Countermeasuresinfo

Recommended: Patch
Status: 🔍

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Timelineinfo

11/25/2015 🔍
12/08/2015 +13 days 🔍
12/08/2015 +0 days 🔍
12/08/2015 +0 days 🔍
12/11/2015 +3 days 🔍
12/11/2015 +0 days 🔍
12/17/2015 +6 days 🔍
12/17/2015 +0 days 🔍
12/18/2015 +1 days 🔍
01/06/2016 +19 days 🔍
06/30/2022 +2367 days 🔍

Sourcesinfo

Vendor: citrix.com

Advisory: XSA-160
Researcher: George Dunlap
Organization: Citrix
Status: Confirmed
Confirmation: 🔍

CVE: CVE-2015-8341 (🔍)
GCVE (CVE): GCVE-0-2015-8341
GCVE (VulDB): GCVE-100-79747

OVAL: 🔍

SecurityFocus: 79036 - Xen CVE-2015-8341 Denial of Service Vulnerability
SecurityTracker: 1034389
Vulnerability Center: 55329 - Xen 4.1 - 4.6 Remote DoS due to Issue in Libxl, High

See also: 🔍

Entryinfo

Created: 12/11/2015 16:35
Updated: 06/30/2022 20:57
Changes: 12/11/2015 16:35 (68), 06/19/2018 20:59 (16), 06/30/2022 20:57 (3)
Complete: 🔍
Cache ID: 216:DBE:103

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