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CVE request: two vulnerabilities in ktsuss 1.4 and earlier
From: John Lightsey <lightsey () debian org>
Date: Sat, 13 Aug 2011 12:32:46 -0500

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I reported these bugs privately to the Debian security team and the
upstream author some time ago, but it does not appear that any CVE was
created as a result.

http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=626178

The 1.3 and 1.4 versions of ktsuss which include a setuid ktsuss binary
suffered from two separate security bugs which can be used for local
root exploits.

The "1.314" version which does not include a setuid ktsuss binary and
uses "su" for privilege escalation does not suffer from these problems.


1) When the target UID is the same as the real UID ktsuss skips
authentication. Under these circumstances, ktsuss fails to change the
effective UID back to the real UID. (line 118 of src/ktsuss.c in version
1.3.)

$ ktsuss -u `whoami` whoami
root


2) The setuid ktsuss binary executes a GTK interface subprocess to
prompt for username and password. This GTK interface runs as root and
allows arbitrary code execution via the GTK_MODULES environmental variable.
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