Linux Kernel 2.6.16.9 do_task_stat input validation

CVSS Meta Temp Score
CVSS is a standardized scoring system to determine possibilities of attacks. The Temp Score considers temporal factors like disclosure, exploit and countermeasures. The unique Meta Score calculates the average score of different sources to provide a normalized scoring system.
Current Exploit Price (≈)
Our analysts are monitoring exploit markets and are in contact with vulnerability brokers. The range indicates the observed or calculated exploit price to be seen on exploit markets. A good indicator to understand the monetary effort required for and the popularity of an attack.
CTI Interest Score
Our Cyber Threat Intelligence team is monitoring different web sites, mailing lists, exploit markets and social media networks. The CTI Interest Score identifies the interest of attackers and the security community for this specific vulnerability in real-time. A high score indicates an elevated risk to be targeted for this vulnerability.
4.0$0-$5k0.00

A vulnerability classified as problematic was found in Linux Kernel 2.6.16.9 (Operating System). Affected by this vulnerability is the function do_task_stat. The manipulation with an unknown input leads to a input validation vulnerability. The CWE definition for the vulnerability is CWE-20. The product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly. As an impact it is known to affect confidentiality. The summary by CVE is:

The do_task_stat function in fs/proc/array.c in the Linux kernel before 2.6.39-rc1 does not perform an expected uid check, which makes it easier for local users to defeat the ASLR protection mechanism by reading the start_code and end_code fields in the /proc/#####/stat file for a process executing a PIE binary.

The issue has been introduced in 03/20/2006. The weakness was released 07/18/2011 by Kees Cook (Website). The advisory is shared at lkml.org. This vulnerability is known as CVE-2011-0726. The exploitation appears to be easy. An attack has to be approached locally. The exploitation doesn't need any form of authentication. Technical details are known, but no exploit is available. The price for an exploit might be around USD $0-$5k at the moment (estimation calculated on 11/14/2021).

The vulnerability was handled as a non-public zero-day exploit for at least 1946 days. During that time the estimated underground price was around $5k-$25k. The vulnerability scanner Nessus provides a plugin with the ID 67081 (CentOS 5 : kernel (CESA-2011:0833)), which helps to determine the existence of the flaw in a target environment. It is assigned to the family CentOS Local Security Checks. The commercial vulnerability scanner Qualys is able to test this issue with plugin 165570 (SUSE Enterprise Linux Security Update Linux Kernel (SUSE-SA:2011:034)).

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

The vulnerability is also documented in the databases at X-Force (67402) and Tenable (67081). Entries connected to this vulnerability are available at 57033, 61066, 60948 and 57962.

Productinfo

Type

Vendor

Name

Version

License

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB CVSS-B Score: 🔍
VulDB CVSS-BT Score: 🔍
VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 4.0
VulDB Meta Temp Score: 4.0

VulDB Base Score: 4.0
VulDB Temp Score: 4.0
VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv2info

AVACAuCIA
💳💳💳💳💳💳
💳💳💳💳💳💳
💳💳💳💳💳💳
VectorComplexityAuthenticationConfidentialityIntegrityAvailability
unlockunlockunlockunlockunlockunlock
unlockunlockunlockunlockunlockunlock
unlockunlockunlockunlockunlockunlock

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

NVD Base Score: 🔍

Exploitinginfo

Class: Input validation
CWE: CWE-20
ATT&CK: Unknown

Local: Yes
Remote: No

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

0-Dayunlockunlockunlockunlock
Todayunlockunlockunlockunlock

Nessus ID: 67081
Nessus Name: CentOS 5 : kernel (CESA-2011:0833)
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Port: 🔍

OpenVAS ID: 69970
OpenVAS Name: Debian Security Advisory DSA 2264-1 (linux-2.6)
OpenVAS File: 🔍
OpenVAS Family: 🔍

Qualys ID: 🔍
Qualys Name: 🔍

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: no mitigation known
Status: 🔍

0-Day Time: 🔍

Patch: 5883f57ca0008ffc93e09cbb9847a1928e50c6f3

Timelineinfo

03/20/2006 🔍
02/01/2011 +1778 days 🔍
05/10/2011 +98 days 🔍
05/10/2011 +0 days 🔍
06/22/2011 +43 days 🔍
07/18/2011 +26 days 🔍
07/18/2011 +0 days 🔍
06/29/2013 +712 days 🔍
03/23/2015 +632 days 🔍
11/14/2021 +2428 days 🔍

Sourcesinfo

Vendor: kernel.org

Advisory: RHSA-2011:0833
Researcher: Kees Cook
Status: Not defined
Confirmation: 🔍

CVE: CVE-2011-0726 (🔍)
OVAL: 🔍
IAVM: 🔍

X-Force: 67402
Vulnerability Center: 31978 - Linux Kernel 2.6.38-rc2 and Earlier Local Information Disclosure Vulnerability, Low
SecurityFocus: 47791 - Linux Kernel '/proc/[pid]/stat' Local Information Disclosure Vulnerability

See also: 🔍

Entryinfo

Created: 03/23/2015 16:50
Updated: 11/14/2021 16:51
Changes: 03/23/2015 16:50 (67), 03/24/2017 16:10 (10), 11/14/2021 16:43 (7), 11/14/2021 16:51 (1)
Complete: 🔍

Discussion

No comments yet. Languages: en.

Please log in to comment.

◂ PreviousOverviewNext ▸

Might our Artificial Intelligence support you?

Check our Alexa App!