XenSource Xen PV Device Support code

CVSS Meta Temp Score
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CTI Interest Score
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5.7$0-$5k0.00

Summaryinfo

A vulnerability identified as problematic has been detected in XenSource Xen. Impacted is an unknown function of the component PV Device Support. The manipulation leads to Local Privilege Escalation. This vulnerability is uniquely identified as CVE-2015-7311. No exploit exists. It is suggested to install a patch to address this issue.

Detailsinfo

A vulnerability was found in XenSource Xen (Virtualization Software) (affected version not known) and classified as problematic. This issue affects some unknown functionality of the component PV Device Support. The manipulation with an unknown input leads to a code vulnerability. Using CWE to declare the problem leads to CWE-17. Impacted is confidentiality, integrity, and availability. The summary by CVE is:

libxl in Xen 4.1.x through 4.6.x does not properly handle the readonly flag on disks when using the qemu-xen device model, which allows local guest users to write to a read-only disk image.

The weakness was disclosed 09/22/2015 as XSA-142 as confirmed security advisory (Website). The advisory is shared at xenbits.xen.org. The identification of this vulnerability is CVE-2015-7311 since 09/22/2015. An attack has to be approached locally. No form of authentication is needed for a successful exploitation. Neither technical details nor an exploit are publicly available.

The vulnerability scanner Nessus provides a plugin with the ID 86055 (Fedora 23 : xen-4.5.1-8.fc23 (2015-15943)), 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 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 (86055), SecurityFocus (BID 76823†), SecurityTracker (ID 1033633†) and Vulnerability Center (SBV-53321†). The entry VDB-79747 is pretty similar. Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Productinfo

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CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 5.9
VulDB Meta Temp Score: 5.7

VulDB Base Score: 5.9
VulDB Temp Score: 5.7
VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv2info

AVACAuCIA
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

NVD Base Score: 🔍

Exploitinginfo

Class: Code
CWE: CWE-17
CAPEC: 🔍
ATT&CK: 🔍

Physical: Partially
Local: Yes
Remote: No

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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Nessus ID: 86055
Nessus Name: Fedora 23 : xen-4.5.1-8.fc23 (2015-15943)
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍

OpenVAS ID: 850584
OpenVAS Name: SuSE Update for xen openSUSE-SU-2016:0124-1 (xen)
OpenVAS File: 🔍
OpenVAS Family: 🔍

Qualys ID: 🔍
Qualys Name: 🔍

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Patch
Status: 🔍

Reaction Time: 🔍
0-Day Time: 🔍
Exposure Time: 🔍

Timelineinfo

09/22/2015 🔍
09/22/2015 +0 days 🔍
09/22/2015 +0 days 🔍
09/22/2015 +0 days 🔍
09/22/2015 +0 days 🔍
09/22/2015 +0 days 🔍
09/24/2015 +2 days 🔍
10/01/2015 +7 days 🔍
10/09/2015 +8 days 🔍
06/18/2022 +2444 days 🔍

Sourcesinfo

Vendor: citrix.com

Advisory: XSA-142
Status: Confirmed
Confirmation: 🔍

CVE: CVE-2015-7311 (🔍)
GCVE (CVE): GCVE-0-2015-7311
GCVE (VulDB): GCVE-100-78017

OVAL: 🔍

SecurityFocus: 76823 - Xen CVE-2015-7311 Security Bypass Vulnerability
SecurityTracker: 1033633
Vulnerability Center: 53321 - Xen Local File System Write Vulnerabilty in libxl - CVE-2015-7311, Low

See also: 🔍

Entryinfo

Created: 09/24/2015 22:25
Updated: 06/18/2022 20:31
Changes: 09/24/2015 22:25 (62), 02/04/2018 10:27 (15), 06/18/2022 20:31 (3)
Complete: 🔍
Cache ID: 216::103

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

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