CVE-2005-2876
HighSummary
The vulnerability in the umount tool from util-linux (versions 2.8 to 2.12q, 2.13-pre1, and 2.13-pre2) and other packages such as loop-aes-utils allows local users with unmount permissions to gain privileges via the -r (remount) option, which causes the file system to be remounted with just the read-only flag, effectively clearing the nosuid, nodev, and other flags.
Risk Assessment
The risk is that a local user can bypass file system security features such as the prohibition of setuid executables (nosuid) or block devices (nodev), potentially leading to privilege escalation and system compromise.
Recommendation
Immediately update the util-linux package to a version newer than 2.12q, 2.13-pre1, or 2.13-pre2, and also check and update other vulnerable packages such as loop-aes-utils. If an update is not possible, restrict unmount permissions for unprivileged users.
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Original NVD description (English source)
umount in util-linux 2.8 to 2.12q, 2.13-pre1, and 2.13-pre2, and other packages such as loop-aes-utils, allows local users with unmount permissions to gain privileges via the -r (remount) option, which causes the file system to be remounted with just the read-only flag, which effectively clears the nosuid, nodev, and other flags.