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-
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- bugfiler vulnerability September 1997
- ------------------------------------------------------------------------
-
- Systems Affected:
- Certain AIX machines. Others: unknown.
- (Vulnerability seen on AIX 3.* systems; no AIX 4.* machine
- inspected exhibited the flaw; all AIX 3.* machines inspected
- were vulnerable; very limited sample size though)
-
- Description:
- bugfiler (/lib/bugfiler) is SUID root.
-
- Impact:
- Local users can circumvent file access restrictions,
- leading to increased privileges. Depending on the
- installation of the system, root privileges may be gained.
-
- Exploit:
- $whoami
- eviluser
- $/lib/bugfiler -b <user> <directory>
-
- creates funny files under the <user>-owned <directory>
- and that may be used by crackers to increase privileges.
- See the manpage of bugfiler for more information.
- (bugfiler does not work for some <user>s)
-
- Further information:
- bugfiler is intended to be run from a mail alias, handle
- bug reports piped to it, and maintain a database of
- bug reports in the specified directory. There should be
- no need for mere mortals executing it, and it should
- be prevented that local users run it. On systems not using
- bugfiler at all, the suggestion for the admin is to simply remove
- the SUID bit from all bugfiler binaries.
- (The actual fix may differ from system to system.)
-
- Mail from "<bugs@...> (Bugs Bunny)" may mean that /lib/bugfiler
- was executed.
-
-