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