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TITLE:
OpenSSL ECDSA Timing Attack Weakness

SECUNIA ADVISORY ID:
SA44572

VERIFY ADVISORY:
Secunia.com
http://secunia.com/advisories/44572/
Customer Area (Credentials Required)
https://ca.secunia.com/?page=viewadvisory&vuln_id=44572

RELEASE DATE:
2011-05-17

DISCUSS ADVISORY:
http://secunia.com/advisories/44572/#comments

AVAILABLE ON SITE AND IN CUSTOMER AREA:
 * Last Update
 * Popularity
 * Comments
 * Criticality Level
 * Impact
 * Where
 * Solution Status
 * Operating System / Software
 * CVE Reference(s)

http://secunia.com/advisories/44572/

ONLY AVAILABLE IN CUSTOMER AREA:
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https://ca.secunia.com/?page=viewadvisory&vuln_id=44572

ONLY AVAILABLE WITH SECUNIA CSI AND SECUNIA PSI:
 * AUTOMATED SCANNING

http://secunia.com/vulnerability_scanning/personal/
http://secunia.com/vulnerability_scanning/corporate/wsus_sccm_3rd_third_party_patching/

DESCRIPTION:
A weakness has been reported in OpenSSL, which can be exploited by
malicious people to disclose potentially sensitive information.

The weakness is caused due to the implementation of the Elliptic
Curve Digital Signature Algorithm (ECDSA) not properly preventing
timing attacks, which can be exploited to e.g. disclose the private
key of a TLS server using ECDSA signatures.

SOLUTION:
Use another signature algorithm.

PROVIDED AND/OR DISCOVERED BY:
Billy Bob Brumley and Nicola Tuveri

ORIGINAL ADVISORY:
Remote Timing Attacks are Still Practical:
http://eprint.iacr.org/2011/232.pdf

OTHER REFERENCES:
Further details available in Customer Area:
http://secunia.com/products/corporate/EVM/

DEEP LINKS:
Further details available in Customer Area:
http://secunia.com/products/corporate/EVM/

EXTENDED DESCRIPTION:
Further details available in Customer Area:
http://secunia.com/products/corporate/EVM/

EXTENDED SOLUTION:
Further details available in Customer Area:
http://secunia.com/products/corporate/EVM/

EXPLOIT:
Further details available in Customer Area:
http://secunia.com/products/corporate/EVM/

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About:
This Advisory was delivered by Secunia as a free service to help
private users keeping their systems up to date against the latest
vulnerabilities.

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