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             AUSCERT External Security Bulletin Redistribution

                  ESB-2006.0947 -- [Linux][BSD][Solaris]
                        Buffer Overflow in OpenSER
                             27 December 2006

===========================================================================

        AusCERT Security Bulletin Summary
        ---------------------------------

Product:              OpenSER
Publisher:            OpenPKG
Operating System:     Linux variants
                      BSD variants
                      Solaris
Impact:               Execute Arbitrary Code/Commands
Access:               Existing Account

Comment: This advisory references vulnerabilities in products which run on
         multiple platforms. It is recommended that administrators
         running OpenSER check for an updated version of the software for
         their operating system.

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____________________________________________________________________________

Publisher Name:          OpenPKG GmbH
Publisher Home:          http://openpkg.com/

Advisory Id (public):    OpenPKG-SA-2006.042
Advisory Type:           OpenPKG Security Advisory (SA)
Advisory Directory:      http://openpkg.com/go/OpenPKG-SA
Advisory Document:       http://openpkg.com/go/OpenPKG-SA-2006.042
Advisory Published:      2006-12-26 12:44 UTC

Issue Id (internal):     OpenPKG-SI-20061226.01
Issue First Created:     2006-12-26
Issue Last Modified:     2006-12-26
Issue Revision:          11
____________________________________________________________________________

Subject Name:            OpenSER
Subject Summary:         SIP router
Subject Home:            http://www.openser.org/
Subject Versions:        * <= 1.1.0

Vulnerability Id:        BID:21706
Vulnerability Scope:     global (not OpenPKG specific)

Attack Feasibility:      run-time
Attack Vector:           local system
Attack Impact:           arbitrary code execution

Description:
    A buffer overflow was discovered [0] in the "parse_expression"
    function of the "permissions" module of the SIP router OpenSER [1],
    versions up to and including 1.1.0. The OpenSER "permissions" module
    is used to determine if a SIP call has appropriate permission to be
    established. The "parse_expression" function is used during parsing
    of the modules local allow/deny configuration files.
    
    The buffer overflow is triggered by parsing a configuration
    line expression consisting of more than 500 characters and
    potentially could lead to the execution of arbitrary code under
    the privileges of the OpenSER process. Successfully exploiting the
    vulnerability requires that the local attacker has write access
    to the configuration files used with the configuration functions
    "allow_routing", "allow_register" and "allow_refer_to".

References:
    [0] http://www.securityfocus.com/archive/1/455097
    [1] http://www.openser.org/
____________________________________________________________________________

Primary Package Name:    openser
Primary Package Home:    http://openpkg.org/go/package/openser

Corrected Distribution:  Corrected Branch: Corrected Package:
OpenPKG Enterprise       E1.0-SOLID        openser-1.1.0-E1.0.1
____________________________________________________________________________

For security reasons, this document was digitally signed with the
OpenPGP public key of the OpenPKG GmbH (public key id 61B7AE34)
which you can download from http://openpkg.com/openpkg.com.pgp
or retrieve from the OpenPGP keyserver at hkp://pgp.openpkg.org/.
Follow the instructions at http://openpkg.com/security/signatures/
for more details on how to verify the integrity of this document.
____________________________________________________________________________

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