AIKIDO-2026-294878
uu_chmod is vulnerable to Race Condition (TOCTOU)
44
Medium Risk
This Affects:
uu_chmodTL;DR
chmod -R checks each entry without following symlinks, then opens subdirectories with an open that follows symlinks and does not recheck after the open. A local user who controls part of the tree can swap a directory for a symlink between the check and the open, so mode changes apply to files outside the intended tree. When root runs chmod -R over a user writable directory, this can widen permissions on sensitive files. The fix opens directories without following symlinks unless the -L option is given.
Who does this affect?
You are affected if you are using a version that falls within the vulnerable range and you run chmod recursively over a directory tree that a local user can modify during the operation.
Background info
uu_chmod is vulnerable to Race Condition (TOCTOU) in versions 0.0.1 - 0.9.0.
How to fix this
Upgrade the uu_chmod library to the patch version.
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