Title: Lmail Temporary File Race Condition Vulnerability
Severity: MODERATE
Description:
Jon Zeeff's lmail is a local mail delivery agent (LDA) designed to provide mail-to-pipe and mail-to-file aliasing for smail.
A race condition vulnerability exists in the lmail program.
The program uses the mktemp() system call to make a unique temporary file name and opens the file in the normally world-writeable /tmp directory. No checking is performed to verify that the file does not already exist, rendering lmail susceptible to a symbolic link attack.
The program also writes data from the standard input stream (stdin) directly to the temporary file.
Because lmail is usually installed setuid root, it may be possible for a local user to overwrite any file on the system with arbitrary data.
Affected Products:
- Jon Zeeff lmail 2.7.0
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