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AA-2009.0148                  AUSCERT Advisory

                                  [Linux]
                       strongSwan: Denial of Service
                               23 June 2009
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        AusCERT Advisory Summary
        ------------------------

Product:              strongSwan
Operating System:     Linux variants
Impact:               Denial of Service
Access:               Remote/Unauthenticated
Member content until: Tuesday, July 21 2009

OVERVIEW:

       Two denial of service vulnerabilities have been reported in
       strongSwan due to an error in the pluto IKE daemon.


IMPACT:

       The vendor has provided the following details:

       asn1 rdn:

       "Applying their fuzzing tool, the Orange Labs vulnerability research 
       team found a Denial-of-Service vulnerability in the parsing of ASN.1 
       Relative Distinguished Names (RDNs). Malformed X.509 certificate RDNs 
       can cause the pluto IKE daemon to crash and restart.

       Apply to strongSwan releases 2.2.0 to 2.8.9." [1]

       asn1 time:

       "Applying their fuzzing tool, the Orange Labs vulnerability research 
       team found a Denial-of-Service vulnerability in the parsing of ASN.1 
       UTCTIME and GENERALIZEDTIME strings. Malformed X.509 certificate time 
       strings can cause the pluto IKE daemon to crash and restart.

       Apply to strongSwan releases 2.2.0 to 2.8.9." [2]


MITIGATION:

       The vendor has made patches available for download on their website.
       [3, 4]


REFERENCES:

       [1] asn1 rdn
           http://download.strongswan.org/patches/05_asn1_rdn_patch/strongswan-2.x.x_asn1_rdn.readme

       [2] asn1 time
           http://download.strongswan.org/patches/06_asn1_time_patch/strongswan-2.x.x_asn1_time.readme

       [3] Index of /patches/05_asn1_rdn_patch
           http://download.strongswan.org/patches/05_asn1_rdn_patch/
 
       [4] Index of /patches/06_asn1_time_patch
           http://download.strongswan.org/patches/06_asn1_time_patch/

AusCERT has made every effort to ensure that the information contained
in this document is accurate.  However, the decision to use the information
described is the responsibility of each user or organisation. The decision to
follow or act on information or advice contained in this security bulletin is
the responsibility of each user or organisation, and should be considered in
accordance with your organisation's site policies and procedures. AusCERT
takes no responsibility for consequences which may arise from following or
acting on information or advice contained in this security bulletin.

If you believe that your computer system has been compromised or attacked in 
any way, we encourage you to let us know by completing the secure National IT 
Incident Reporting Form at:

        http://www.auscert.org.au/render.html?it=3192

===========================================================================
Australian Computer Emergency Response Team
The University of Queensland
Brisbane
Qld 4072

Internet Email: auscert@auscert.org.au
Facsimile:      (07) 3365 7031
Telephone:      (07) 3365 4417 (International: +61 7 3365 4417)
                AusCERT personnel answer during Queensland business hours
                which are GMT+10:00 (AEST).
                On call after hours for member emergencies only.
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