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OpenSSL: Various ASN.1 Memory Vulnerabilities Causing DoS Risks

CERT is coordinating multiple security vulnerabilities in OpenSSL, the open source SSL/TLS implementation including an ASN.1 memory deallocation vulnerability and an ASN.1 tag vulnerability.. . .. CERT is coordinating multiple security vulnerabilities in OpenSSL, the open source SSL/TLS implementation including an ASN.1 memory deallocation vulnerability and an ASN.1 tag vulnerability. OpenSSL ASN.1 parser insecure memory deallocation - Vulnerability Note VU#935264 A vulnerability in the way OpenSSL deallocates memory used to store ASN.1 structures could allow a remote attacker to execute arbitrary code with the privileges of the process using the OpenSSL library. OpenSSL 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. Clients and servers exchange authentication information in X.509 certificates. While the SSL and TLS protocols are not directly based on ASN.1, they do rely on ASN.1 objects used in X.509 certificates and other cryptographic elements (e.g. PKCS#1 encoded RSA values). The ASN.1 parser in OpenSSL is also used to handle non-SSL/TLS elements such as PKCS#7 encoded S/MIME parts. There is a vulnerability in the way OpenSSL deallocates memory used to store ASN.1 structures (ASN1_TYPE). Parsing specially crafted ASN.1 encoded structures that OpenSSL determines to be invalid could cause memory to be deallocated insecurely, corrupting the stack. OpenSSL does not securely handle ASN.1 tags (1) - Vulnerability Note VU#255484 A vulnerability in the way OpenSSL handles ASN.1 tags could allow a remote attacker to cause a denial of service. OpenSSL contains a vulnerability in the way ASN.1 tags are handled. A specially crafted ASN.1 tag could cause the OpenSSL library to perform an out-of-bounds memory read operation. This couldresult in a denial of service, crashing the process using the OpenSSL library. Vendors are currently coordinating updates to all affected packages. Relevant links thus far include : OpenSSL ASN.1 parser insecure memory deallocation - Vulnerability Note VU#935264 OpenSSL does not securely handle ASN.1 tags (1) - Vulnerability Note VU#255484 NISCC Vulnerability Advisory 006489/OpenSSL - Background on the vulnerabilities . CERT is coordinating multiple security vulnerabilities in OpenSSL, the open source SSL/TLS implement. coordinating, security, vulnerabilities, openssl, source, ssl/tls, implement. . LinuxSecurity.com Team

Sep 30, 2003 • LinuxSecurity.com Team Cryptography