Bug 24328

Summary:	CVE-2010-3394: insecure library loading
Product:	Sisyphus	Reporter:	Vladimir Lettiev <crux>
Component:	TeXmacs	Assignee:	Ilya Mashkin <oddity>
Status:	CLOSED FIXED	QA Contact:	qa-sisyphus
Severity:	blocker
Priority:	P3	Keywords:	security
Version:	unstable
Hardware:	all
OS:	Linux
URL:	http://bugs.debian.org/598424

Description Vladimir Lettiev 2010-10-16 11:41:35 MSD

The vulnerability is introduced by an insecure change to
LD_LIBRARY_PATH, an environment variable used by ld.so(8) to look for
libraries on a directory other than the standard paths.

Vulnerable code follows:

/usr/lib/texmacs/TeXmacs/bin/tm_mupad_help line 29:
LD_LIBRARY_PATH=$LD_LIBRARY_PATH:${MuPAD_ROOT_PATH}/${SYSINFO}/lib:/usr/local/X11R6/motif-2.0/lib:/usr/local/X11R6/lib:$MuPAD_ROOT_PATH/$SYSINFO/bin
/usr/bin/texmacs line 30:
LD_LIBRARY_PATH="$TEXMACS_BIN_PATH/lib${LD_LIBRARY_PATH+":$LD_LIBRARY_PATH"}"

When there's an empty item on the colon-separated list of
LD_LIBRARY_PATH, ld.so treats it as '.' (i.e. CWD/$PWD.)
If the given script is executed from a directory where a potential,
local, attacker can write files to, there's a chance to exploit this
bug.

Comment 1 Repository Robot 2010-10-23 14:36:33 MSD

TeXmacs-1.0.7.7-alt1 -> sisyphus:

* Sat Oct 23 2010 Ilya Mashkin <oddity@altlinux> 1.0.7.7-alt1
- 1.0.7.7
- fix CVE-2010-3394 (Etienne Millon) (Closes: #24328)