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AA-2007.0066                  AUSCERT Advisory

                             [Win][UNIX/Linux]
       OpenSSL RSA encryption may allow local private key compromise
                              10 August 2007
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        AusCERT Advisory Summary
        ------------------------

Product:              OpenSSL 0.9.8e and proir
Operating System:     UNIX variants (UNIX, Linux, OSX)
                      Windows
Impact:               Access Privileged Data
Access:               Existing Account
CVE Names:            CVE-2007-3108
Member content until: Friday, September 07 2007

Original Bulletin:    http://www.kb.cert.org/vuls/id/724968

OVERVIEW:
        
        The RSA encryption algorithm of OpenSSL contains a vulnerability 
        which may allow an untrusted local user to obtain the private key.


IMPACT: 

        From the National Vulnerability Database [1]:

          "The BN_from_montgomery function in crypto/bn/bn_mont.c in 
           OpenSSL 0.9.8e and earlier does not properly perform Montgomery 
           multiplication, which might allow local users to conduct a 
           side-channel attack and retrieve RSA private keys."

        Other encryption software may be vulnerable, but AusCERT is unaware 
        of any other implementations that have been confirmed to contain 
        this vulnerability.


MITIGATION:

        OpenSSL has released a patch correcting this vulnerability [2].


REFERENCES:

        [1] National Vulnerability Database (CVE-2007-3108)
            http://nvd.nist.gov/nvd.cfm?cvename=CVE-2007-3108

        [2] OpenSSL patch CVE-2007-3108
            http://openssl.org/news/patch-CVE-2007-3108.txt


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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