Linux Kernel up to 4.9.12 ipc/shm.c do_shmat access control

CVSS Meta Temp Score
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CTI Interest Score
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6.3$0-$5k0.00

Summaryinfo

A vulnerability identified as problematic has been detected in Linux Kernel up to 4.9.12. This affects the function do_shmat of the file ipc/shm.c. Performing a manipulation results in access control. This vulnerability is identified as CVE-2017-5669. The attack is only possible with local access. There is not any exploit available. It is suggested to install a patch to address this issue.

Detailsinfo

A vulnerability classified as problematic has been found in Linux Kernel up to 4.9.12 (Operating System). This affects the function do_shmat of the file ipc/shm.c. The manipulation with an unknown input leads to a access control vulnerability. CWE is classifying the issue as CWE-264. This is going to have an impact on confidentiality, integrity, and availability. The summary by CVE is:

The do_shmat function in ipc/shm.c in the Linux kernel through 4.9.12 does not restrict the address calculated by a certain rounding operation, which allows local users to map page zero, and consequently bypass a protection mechanism that exists for the mmap system call, by making crafted shmget and shmat system calls in a privileged context.

The bug was discovered 02/28/2017. The weakness was released 02/24/2017 as confirmed git commit (GIT Repository). The advisory is shared at github.com. This vulnerability is uniquely identified as CVE-2017-5669 since 01/31/2017. An attack has to be approached locally. A authentication is required for exploitation. Technical details are known, but no exploit is available. MITRE ATT&CK project uses the attack technique T1068 for this issue.

The vulnerability scanner Nessus provides a plugin with the ID 97640 (Debian DLA-849-1 : 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 175984 (Debian Security Update for Linux (DSA 3804-1)).

Applying a patch is able to eliminate this problem. The bugfix is ready for download at github.com. A possible mitigation has been published 2 weeks after the disclosure of the vulnerability.

The vulnerability is also documented in the databases at Tenable (97640), SecurityFocus (BID 96754†) and SecurityTracker (ID 1037918†). Entries connected to this vulnerability are available at VDB-97226, VDB-97445, VDB-97446 and VDB-97448. 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: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 6.5
VulDB Meta Temp Score: 6.4

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

NVD Base Score: 7.8
NVD Vector: 🔍

CVSSv2info

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

NVD Base Score: 🔍

Exploitinginfo

Class: Access control
CWE: CWE-264
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: 97640
Nessus Name: Debian DLA-849-1 : linux security update
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Context: 🔍

OpenVAS ID: 703804
OpenVAS Name: Debian Security Advisory DSA 3804-1 (linux - security update)
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: 🔍

Patch: github.com

Timelineinfo

01/10/2017 🔍
01/31/2017 +21 days 🔍
02/24/2017 +24 days 🔍
02/24/2017 +0 days 🔍
02/24/2017 +0 days 🔍
02/24/2017 +0 days 🔍
02/28/2017 +3 days 🔍
02/28/2017 +0 days 🔍
03/09/2017 +9 days 🔍
03/10/2017 +1 days 🔍

Sourcesinfo

Vendor: kernel.org

Advisory: github.com
Status: Confirmed
Confirmation: 🔍

CVE: CVE-2017-5669 (🔍)
GCVE (CVE): GCVE-0-2017-5669
GCVE (VulDB): GCVE-100-97281

OVAL: 🔍

SecurityFocus: 96754 - Linux Kernel CVE-2017-5669 Local Security Bypass Vulnerability
OSVDB: - CVE-2017-5669 - Linux - Security Bypass Issue
SecurityTracker: 1037918

See also: 🔍

Entryinfo

Created: 02/24/2017 20:16
Changes: 02/24/2017 20:16 (91)
Complete: 🔍
Cache ID: 216:6EE:103

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