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Vulnerability Note VU#288574OpenSSL contains null-pointer assignment in do_change_cipher_spec() functionOverviewOpenSSL contains a null-pointer assignment in the do_change_cipher_spec() function which could allow a remote, unauthenticated attacker to cause OpenSSL to crash.I. DescriptionOpenSSL implements the Secure Sockets Layer (SSL) and Transport Layer Security (TLS) protocols and includes a general purpose cryptographic library. SSL and TLS are commonly used to provide authentication, encryption, integrity, and non-repudiation services to network applications such as HTTP, IMAP, POP3, LDAP, and others.Versions of OpenSSL from 0.9.6c to 0.9.6k inclusive and 0.9.7a to 0.9.7c inclusive contain a null-pointer assignment in the do_change_cipher_spec() function. By sending a specially crafted SSL/TLS handshake to an application that uses a vulnerable OpenSSL library, a remote, unauthenticated attacker could cause OpenSSL to crash. Upgrade to OpenSSL 0.9.7d or 0.9.6m. Alternatively, upgrade or apply a patch as specified by your vendor. Note that it is necessary to recompile any applications that are statically linked to OpenSSL libraries.
Referenceshttp://www.us-cert.gov/cas/techalerts/TA04-078A.html This vulnerability was discovered by the OpenSSL Project and reported by the National Infrastructure Security Co-ordination Centre (NISCC). This document was written by Damon Morda.
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