[UNIX] OpenSLP Initscript Symlink Vulnerability

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To: list@securiteam.com
Date: 24 Aug 2003 19:05:43 +0200

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  OpenSLP Initscript Symlink Vulnerability
------------------------------------------------------------------------

SUMMARY

 <http://www.openslp.org> OpenSLP is "an implementation of the 'Service
Location Protocol V2', an IETF standards track protocol that provides a
framework to allow networking applications to discover the existence,
location, and configuration of networked services in enterprise networks".

There is symbolic link vulnerability in one of the initscripts provided
with OpenSLP. The slpd.all_init file uses '/tmp/route.check' as a
temporarily file in an unsafe manner.

DETAILS

Vulnerable systems:
 * OpenSLP version 1.0.11

Since the slpd.all_init script is usually called by the root user (to
start the service), an attacker could exploit this vulnerability to at
least "reset" the content of any file in the system as soon as the "start"
action is called. As a standard symlink vulnerability, all the attacker
needs is to create a /tmp/route.check symlink pointing to a system file.

Fortunately, the aforementioned initscript is not used by many vendors
(only Conectiva, accordingly to a vendor-sec discussion). Debian
distributes OpenSLP but uses another script.

Vulnerable code:
From the slpd.all_init file:
    ...
  TMP_FILE=/tmp/route.check
  ...
  ping ... > $TMP_FILE
  ...
  rm -f $TMP_FILE
  ...

Vendor status:
The OpenSLP maintainers and the people from vendor-sec were contacted on
2003-Aug-07 and agreed on this disclosure date.

ADDITIONAL INFORMATION

The information has been provided by <mailto:ademar@conectiva.com.br>
Ademar de Souza Reis Jr..

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