OpenSSL Multiple Vulnerabilities in Client Certificate Handling - Secunia Advisories - Vulnerability Intelligence

OpenSSL Multiple Vulnerabilities in Client Certificate Handling
Secunia Advisory:	SA9886	Advisory Toolbox: Issue ticket Save in to-do list Mark as handled Exploit information Download as PDF Review actions Add comment
Release Date:	2003-10-01
Last Update:	2003-11-04
Popularity:	15,663 views

Critical:	Highly critical
Impact:	DoS System access
Where:	From remote
Solution Status:	Vendor Patch

Software:	OpenSSL 0.9.x

Subscribe:	Instant alerts on relevant vulnerabilities

CVE reference:	CVE-2003-0545 CVE-2003-0543 CVE-2003-0544

Description: Multiple vulnerabilities have been identified in OpenSSL, which potentially allow malicious people to cause a DoS (Denial of Service) or to compromise a vulnerable system. 1) ASN.1 encodings rejected by the parser because they are invalid may cause a deallocation of memory. It is currently unknown if this can be exploited to execute arbitrary code or merely cause a DoS. 2) It is possible to cause an out of bounds read by supplying unusual ASN.1 tag values. This may cause a DoS. 3) If OpenSSL is in debug mode, an invalid public key in a certificate may cause the verify code to crash. This could lead to a DoS against systems running in debug mode. An error causes OpenSSL to parse and handle client certificates even when OpenSSL isn't configured to do so. Version 0.9.6j and prior are vulnerable (0.9.6 versions are not affected by issue 1). Version 0.9.7b and prior are vulnerable. Solution: Update to version 0.9.6k or 0.9.7c. OpenSSL 0.9.6k: http://www.openssl.org/source/openssl-0.9.6k.tar.gz http://www.openssl.org/source/openssl-engine-0.9.6k.tar.gz OpenSSL 0.9.7c: http://www.openssl.org/source/openssl-0.9.7c.tar.gz Provided and/or discovered by: NISCC Changelog: 2003-10-01: Updated references to different CERT Vulnerability Notes. Updated affected versions. 2003-11-04: Updated "Description" section. Original Advisory: http://www.uniras.gov.uk/vuls/2003/006489/openssl.htm http://www.openssl.org/news/secadv_20030930.txt Other References: http://www.kb.cert.org/vuls/id/732952 http://www.kb.cert.org/vuls/id/104280 http://www.kb.cert.org/vuls/id/935264 http://www.kb.cert.org/vuls/id/255484 http://www.kb.cert.org/vuls/id/380864 http://www.kb.cert.org/vuls/id/686224 http://www.cert.org/advisories/CA-2003-26.html

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