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Insecure Library Loading
Not critical

Linux Kernel "/proc/<pid>/" Permissions Handling Weakness

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Release Date:  2011-02-25    Views:  3,700

Secunia Advisory SA43496

Where:

Local system

Impact:

Security Bypass

Solution Status:

Unpatched

Operating System:

CVE Reference(s):

Description


halfdog has discovered a weakness in the Linux Kernel, which can be exploited by malicious, local users to bypass certain security restrictions.

The weakness is caused due to improper permissions handling of opened files within the "/proc/<pid>/" directory when a SUID program is being executed. This can be exploited to disclose certain memory information or manipulate some process settings (e.g. coredump_filter).

The weakness is confirmed in version 2.6.37. Other versions may also be affected.


Solution:
Restrict access to trusted users only.

Provided and/or discovered by:
halfdog

Original Advisory:
halfdog:
http://www.halfdog.net/Security/2011/SuidBinariesAndProcInterface/

LKML:
https://lkml.org/lkml/2011/2/7/368

Deep Links:
Links available to Secunia VIM customers

Do you have additional information related to this advisory?

Please provide information about patches, mitigating factors, new versions, exploits, faulty patches, links, and other relevant data by posting comments to this Advisory. You can also send this information to vuln@secunia.com

Subject: Linux Kernel "/proc/<pid>/" Permissions Handling Weakness

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