Title: Siemens Reliant Unix ppd -T Race Condition Vulnerability
Severity: HIGH
Description:
Reliant Unix is a variant of the UNIX Operating System distributed by Fujitsu-Siemens. Reliant Unix is a scalable UNIX Operating system designed for use on Fujitsu-Siemens servers.
Problems with the ppd program could make it possible for a user with local system access to deny service to other users, and potentially gain elevated privileges. ppd is a program for initiating remote dialup connections to other systems.
ppd creates files in the /tmp directory insecurely. When using the -T flag, ppd creates a file using the extension /tmp/ppd.trace. As the ppd program executes with SUID privileges, this file may be subject to a symbolic link attack. It is possible for a local user to symbolically link any file to this file extension. After execution of ppd.trace, the linked file is overwritten.
Affected Products:
- Siemens Reliant UNIX 5.43.0
- Siemens Reliant UNIX 5.44.0
- Siemens Reliant UNIX 5.45.0
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