Package: texmacs
Version: 1:1.0.7.4-2
Severity: grave
Tags: security
User: t...@security.debian.org
Usertags: ldpath
Hello,
During a review of the Debian archive, I've found your package to
contain a script that can be abused by an attacker to execute arbitrary
code.
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.
This vulnerability has been assigned the CVE id CVE-2010-3394. Please make sure
you mention it when forwarding this report to upstream and when fixing
this bug (everywhere: upstream and here at Debian.)
[0] http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2010-3394
[1] http://security-tracker.debian.org/tracker/CVE-2010-3394
Sincerely,
Raphael Geissert
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