VDB-97117 · CVE-2017-6001 · BID 96264

Linux Kernel up to 4.9.6 Fix CVE-2016-6786 kernel/events/core.c race condition

CVSS Meta Temp Score
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Current Exploit Price (≈)
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CTI Interest Score
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5.9$0-$5k0.00

A vulnerability was found in Linux Kernel up to 4.9.6 (Operating System). It has been declared as problematic. Affected by this vulnerability is some unknown processing of the file kernel/events/core.c of the component Fix CVE-2016-6786. The manipulation with an unknown input leads to a race condition vulnerability. The CWE definition for the vulnerability is CWE-362. The product contains a code sequence that can run concurrently with other code, and the code sequence requires temporary, exclusive access to a shared resource, but a timing window exists in which the shared resource can be modified by another code sequence that is operating concurrently. As an impact it is known to affect confidentiality, integrity, and availability. The summary by CVE is:

Race condition in kernel/events/core.c in the Linux kernel before 4.9.7 allows local users to gain privileges via a crafted application that makes concurrent perf_event_open system calls for moving a software group into a hardware context. NOTE: this vulnerability exists because of an incomplete fix for CVE-2016-6786.

The bug was discovered 02/17/2017. The weakness was disclosed 02/18/2017 (oss-sec). The advisory is shared at openwall.com. This vulnerability is known as CVE-2017-6001 since 02/15/2017. An attack has to be approached locally. Required for exploitation is a single authentication. Technical details are known, but no exploit is available.

The vulnerability was handled as a non-public zero-day exploit for at least 1 days. During that time the estimated underground price was around $5k-$25k. The vulnerability scanner Nessus provides a plugin with the ID 97357 (Debian DSA-3791-1 : linux - 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 371045 (F5 BIG-IP ASM Multiple Vulnerabilitites (K24578092,K29146534,K51801290,K93472064)).

Upgrading to version 4.9.7 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 4 days after the disclosure of the vulnerability.

The vulnerability is also documented in the vulnerability database at Tenable (97357). The entries 93850, 95265, 96557 and 96563 are pretty similar.

Productinfo

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CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB CVSS-B Score: 🔍
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CVSSv3info

VulDB Meta Base Score: 6.1
VulDB Meta Temp Score: 6.0

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

NVD Base Score: 7.0
NVD Vector: 🔍

CVSSv2info

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VulDB Base Score: 🔍
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Exploitinginfo

Class: Race condition
CWE: CWE-362
ATT&CK: Unknown

Local: Yes
Remote: No

Availability: 🔍
Status: Not defined

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EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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Nessus ID: 97357
Nessus Name: Debian DSA-3791-1 : linux - security update
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Context: 🔍

OpenVAS ID: 703791
OpenVAS Name: Debian Security Advisory DSA 3791-1 (linux - security update)
OpenVAS File: 🔍
OpenVAS Family: 🔍

Qualys ID: 🔍
Qualys Name: 🔍

Threat Intelligenceinfo

Interest: 🔍
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Countermeasuresinfo

Recommended: Patch
Status: 🔍

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0-Day Time: 🔍
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Upgrade: Kernel 4.9.7
Patch: git.kernel.org

Timelineinfo

02/15/2017 🔍
02/16/2017 +1 days 🔍
02/17/2017 +1 days 🔍
02/18/2017 +1 days 🔍
02/18/2017 +0 days 🔍
02/19/2017 +1 days 🔍
02/19/2017 +0 days 🔍
02/22/2017 +2 days 🔍
02/24/2017 +2 days 🔍

Sourcesinfo

Vendor: kernel.org

Advisory: openwall.com
Status: Confirmed
Confirmation: 🔍

CVE: CVE-2017-6001 (🔍)
OVAL: 🔍

SecurityFocus: 96264 - Linux Kernel CVE-2017-6001 Incomplete Fix Local Privilege Escalation Vulnerability
OSVDB: - CVE-2017-6001 - Linux - Privilege Escalation Issue

See also: 🔍

Entryinfo

Created: 02/19/2017 09:30
Changes: 02/19/2017 09:30 (88)
Complete: 🔍

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