Linux Kernel up to 4.11.7 blkback.c make_response Kernel Memory information disclosure

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

Summaryinfo

A vulnerability labeled as problematic has been found in Linux Kernel up to 4.11.7. Affected is the function make_response of the file drivers/block/xen-blkback/blkback.c. Executing a manipulation can lead to information disclosure (Kernel Memory). This vulnerability is handled as CVE-2017-10911. It is possible to launch the attack on the local host. There is not any exploit available. It is advisable to implement a patch to correct this issue.

Detailsinfo

A vulnerability has been found in Linux Kernel up to 4.11.7 (Operating System) and classified as problematic. This vulnerability affects the function make_response of the file drivers/block/xen-blkback/blkback.c. The manipulation with an unknown input leads to a information disclosure vulnerability (Kernel Memory). The CWE definition for the vulnerability is CWE-200. The product exposes sensitive information to an actor that is not explicitly authorized to have access to that information. As an impact it is known to affect confidentiality. CVE summarizes:

The make_response function in drivers/block/xen-blkback/blkback.c in the Linux kernel before 4.11.8 allows guest OS users to obtain sensitive information from host OS (or other guest OS) kernel memory by leveraging the copying of uninitialized padding fields in Xen block-interface response structures, aka XSA-216.

The bug was discovered 06/20/2017. The weakness was released 07/05/2017 with Citrix as confirmed git commit (GIT Repository). The advisory is shared for download at git.kernel.org. This vulnerability was named CVE-2017-10911 since 07/04/2017. The exploitation appears to be easy. The attack needs to be approached locally. No form of authentication is required for a successful exploitation. There are known technical details, but no exploit is available. The MITRE ATT&CK project declares the attack technique as T1592.

The vulnerability was handled as a non-public zero-day exploit for at least 14 days. During that time the estimated underground price was around $0-$5k. The vulnerability scanner Nessus provides a plugin with the ID 101985 (Debian DSA-3920-1 : qemu - security update), which helps to determine the existence of the flaw in a target environment. It is assigned to the family Debian Local Security Checks and running in the context l. The commercial vulnerability scanner Qualys is able to test this issue with plugin 176099 (Debian Security Update for qemu (DSA 3920-1)).

Upgrading to version 4.11.8 eliminates this vulnerability. Applying a patch is able to eliminate this problem. The bugfix is ready for download at git.kernel.org. The best possible mitigation is suggested to be patching the affected component. A possible mitigation has been published 3 weeks after the disclosure of the vulnerability.

The vulnerability is also documented in the databases at Tenable (101985) and SecurityFocus (BID 99162†). Entries connected to this vulnerability are available at VDB-102641, VDB-102642, VDB-102643 and VDB-103283. Once again VulDB remains the best source for vulnerability data.

Productinfo

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CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

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

VulDB Base Score: 3.8
VulDB Temp Score: 3.7
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 6.5
NVD Vector: 🔍

CVSSv2info

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VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

NVD Base Score: 🔍

Exploitinginfo

Name: Kernel Memory
Class: Information disclosure / Kernel Memory
CWE: CWE-200 / CWE-284 / CWE-266
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: 101985
Nessus Name: Debian DSA-3920-1 : qemu - security update
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Context: 🔍

OpenVAS ID: 103302
OpenVAS Name: Citrix XenServer Multiple Security Updates
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: 🔍

Upgrade: Kernel 4.11.8
Patch: git.kernel.org

Timelineinfo

06/20/2017 🔍
06/20/2017 +0 days 🔍
07/04/2017 +14 days 🔍
07/04/2017 +0 days 🔍
07/05/2017 +1 days 🔍
07/05/2017 +0 days 🔍
07/25/2017 +20 days 🔍
07/27/2017 +2 days 🔍
12/09/2022 +1961 days 🔍

Sourcesinfo

Vendor: kernel.org

Advisory: 089bc0143f489bd3a4578bdff5f4ca68fb26f341
Researcher: Anthony Perard
Organization: Citrix
Status: Confirmed
Confirmation: 🔍

CVE: CVE-2017-10911 (🔍)
GCVE (CVE): GCVE-0-2017-10911
GCVE (VulDB): GCVE-100-103036

OVAL: 🔍

SecurityFocus: 99162 - Xen 'blkif' Response Information Disclosure Vulnerability
SecurityTracker: 1038720

See also: 🔍

Entryinfo

Created: 07/05/2017 10:24
Updated: 12/09/2022 16:58
Changes: 07/05/2017 10:24 (82), 10/22/2019 09:46 (6), 12/30/2020 16:37 (2), 12/30/2020 16:41 (1), 12/09/2022 16:51 (3), 12/09/2022 16:58 (1)
Complete: 🔍
Cache ID: 216:B78:103

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