Date: 10 August 2007
References: ESB-2007.0738 ESB-2007.0788 ESB-2008.0480
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AA-2007.0066 AUSCERT Advisory
OpenSSL RSA encryption may allow local private key compromise
10 August 2007
AusCERT Advisory Summary
Product: OpenSSL 0.9.8e and proir
Operating System: UNIX variants (UNIX, Linux, OSX)
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
The RSA encryption algorithm of OpenSSL contains a vulnerability
which may allow an untrusted local user to obtain the private key.
From the National Vulnerability Database :
"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
OpenSSL has released a patch correcting this vulnerability .
 National Vulnerability Database (CVE-2007-3108)
 OpenSSL patch CVE-2007-3108
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:
Australian Computer Emergency Response Team
The University of Queensland
Internet Email: firstname.lastname@example.org
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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