var-200109-0013
Vulnerability from variot

Check Point FireWall-1 3.0b through 4.1 for Solaris allows local users to overwrite arbitrary files via a symlink attack on temporary policy files that end in a .cpp extension, which are set world-writable. Check Point Firewall-1 is a commercial firewall implementation designed for small to enterprise sized networks. A problem with Firewall-1 has been discovered that makes it possible for a local user to change the permissions of root-owned files to world-writable, and potentially gain elevated privileges. The problem is in the creation of predictable /tmp files. Upon editing firewall rules and committing them, a file is created in /tmp using the name of the policy as a filename, and .cpp as an extension. It's possible for a local user to create symbolic links to root-owned files, which will result in the files becoming world-writable, and potentially gain local root access. The file's attributes are set to rw-rw-rw- (666), which allows anyone to modify the file. Since the file is not checked whether it is a link file when the file is created, an attacker can create a file in any directory through a link attack. If an attacker has permission to compile firewall policies and has access to the system where the firewall resides, this vulnerability could be exploited to elevate privileges

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