Permissions, Privileges, and Access Controls in Linux kernel - CVE-2011-2495

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Main Vulnerability Database Vulnerabilities #VU43987

Permissions, Privileges, and Access Controls in Linux kernel - CVE-2011-2495

Published: June 13, 2012 / Updated: August 11, 2020


Vulnerability identifier: #VU43987
CSH Severity: Low
CVSS v4: 5.1 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2011-2495
CWE-ID: CWE-264
Exploitation vector: Remote access
Exploit availability: No public exploit available

Vulnerability details

The vulnerability allows a remote non-authenticated attacker to gain access to sensitive information.

fs/proc/base.c in the Linux kernel before 2.6.39.4 does not properly restrict access to /proc/#####/io files, which allows local users to obtain sensitive I/O statistics by polling a file, as demonstrated by discovering the length of another user's password.


Affected software

Linux kernel
Ubuntu
linux (Ubuntu package)
linux-lts-backport-maverick (Ubuntu package)
linux-lts-backport-natty (Ubuntu package)

How to mitigate CVE-2011-2495

Install update from vendor's website.

linux (Ubuntu package) - addressed in versions 2.6.24-29.95, 2.6.32-35.78, 2.6.35-30.61, 2.6.38-13.52
linux-lts-backport-maverick (Ubuntu package) - update to 2.6.35-30.61~lucid1
linux-lts-backport-natty (Ubuntu package) - update to 2.6.38-13.52~lucid1

External References

Related Security Bulletins