TITLE:
noweb Insecure Temporary File Creation Vulnerabilities

SECUNIA ADVISORY ID:
SA18809

VERIFY ADVISORY:
http://secunia.com/advisories/18809/

CRITICAL:
Less critical

IMPACT:
Privilege escalation

WHERE:
Local system

SOFTWARE:
noweb 2.x
http://secunia.com/product/8035/

DESCRIPTION:
Javier Fernández-Sanguino Peña has reported multiple vulnerabilities
in noweb, which can be exploited by malicious, local users to perform
certain actions on a vulnerable system with escalated privileges.

Temporary files are created insecurely in the "/tmp" directory by the
"src/lib/toascii.nw" and "src/shell/roff.mm" scripts. This can be
exploited via symlink attacks to create or overwrite arbitrary files
with the privileges of the user running an affected script

The vulnerabilities have been reported in versions 2.9a and 2.10c.
Other versions may also be affected.

The following priorly reported scripts are also still affected:
* contrib/conrado/d2tex
* contrib/norman/htmlgif/pstopbm
* contrib/jobling/correct-refs.nw
* src/awkname
* src/awk/totex.nw
* src/lib/toascii
* contrib/rsc/rc/toascii.nw
* contrib/rsc/rc/cpif.nw
* src/shell/nonu
* src/shell/roff.nw
* src/shell/noroff
* src/shell/toroff

SOLUTION:
Grant only trusted users access to affected systems.

PROVIDED AND/OR DISCOVERED BY:
Javier Fernández-Sanguino Peña

ORIGINAL ADVISORY:
http://www.debian.org/security/2006/dsa-968

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