OpenSSL: Multiple vulnerabilities

1.  Gentoo Linux Security Advisory

Version Information

Related bugreports: #145510

Synopsis

OpenSSL contains multiple vulnerabilities including the possible remote execution of arbitrary code.

2.  Impact Information

Background

OpenSSL is a toolkit implementing the Secure Sockets Layer, Transport Layer Security protocols and a general-purpose cryptography library.

Description

Tavis Ormandy and Will Drewry, both of the Google Security Team, discovered that the SSL_get_shared_ciphers() function contains a buffer overflow vulnerability, and that the SSLv2 client code contains a flaw leading to a crash. Additionally Dr. Stephen N. Henson found that the ASN.1 handler contains two Denial of Service vulnerabilities: while parsing an invalid ASN.1 structure and while handling certain types of public key.

Impact

An attacker could trigger the buffer overflow vulnerability by sending a malicious suite of ciphers to an application using the vulnerable function, and thus execute arbitrary code with the rights of the user running the application. An attacker could also consume CPU and/or memory by exploiting the Denial of Service vulnerabilities. Finally a malicious server could crash a SSLv2 client through the SSLv2 vulnerability.

3.  Resolution Information

Workaround

There is no known workaround at this time.

Resolution

All OpenSSL 0.9.8 users should upgrade to the latest version:

# emerge --sync
# emerge --ask --oneshot --verbose ">=dev-libs/openssl-0.9.8d"

All OpenSSL 0.9.7 users should upgrade to the latest version:

# emerge --sync
# emerge --ask --oneshot --verbose ">=dev-libs/openssl-0.9.7l"

4.  References

• CVE-2006-2937
• CVE-2006-2940
• CVE-2006-3738
• CVE-2006-4343