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OpenSSL RSA blinding attack Advisory Available in Danish 

Secunia Advisory: SA8330  
Release Date: 2003-03-19
Last Update: 2003-04-11

Critical:
Less critical
Impact: Exposure of sensitive information
Where: From remote
Solution Status: Vendor Patch

Software:OpenSSL 0.9.x

CVE reference:CVE-2003-0147 (Secunia mirror)

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Description:
OpenSSL has been found vulnerable to a timing attack, which has been proven to be a feasible way to recover the RSA secret from systems running OpenSSL.

The problem is that various queries takes different amounts of processing time, this information can be used to guess the private key.

The attacks has been proven feasible over LANs and high speed internet connections. It is required that the load on the server is low and that the network load is low so that an attacker can measure the time differences.

This attack only requires 300.000 to 1.400.000 queries to the ssl server.

Solution:
Upgrade to version 0.9.7b:
http://www.openssl.org/source/openssl-0.9.7b.tar.gz

If RSA blinding is on, you are not vulnerable.

Provided and/or discovered by:
D. Boneh and D. Brumley

Changelog:
2003-04-11: Updated version of OpenSSL released.

Original Advisory:
http://crypto.stanford.edu/~dabo/abstracts/ssl-timing.html



Please note: The information that this Secunia Advisory is based on comes from a third party unless stated otherwise.

Secunia collects, validates, and verifies all vulnerability reports issued by security research groups, vendors, and others.

12 Related Secunia Security Advisories, displaying 10

1. OpenSSL Two Denial of Service Vulnerabilities
2. OpenSSL DTLS Implementation Vulnerability
3. OpenSSL Multiple Vulnerabilities
4. OpenSSL RSA Signature Forgery Vulnerability
5. OpenSSL Potential SSL 2.0 Rollback Vulnerability
6. OpenSSL "der_chop" Script Insecure Temporary File Creation
7. OpenSSL SSL/TLS Handshake Denial of Service Vulnerabilities
8. OpenSSL ASN.1 Parsing Denial of Service Vulnerability
9. OpenSSL Multiple Vulnerabilities in Client Certificate Handling
10. OpenSSL retrieval of premaster-secret

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