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AMD64 x86 emulation base libraries: OpenSSL multiple vulnerabilities


1.  Gentoo Linux Security Advisory

Version Information

Advisory Reference GLSA 200612-11 / emul-linux-x86-baselibs
Release Date December 11, 2006
Latest Revision December 11, 2006: 01
Impact high
Exploitable remote
Package Vulnerable versions Unaffected versions Architecture(s)
app-emulation/emul-linux-x86-baselibs < 2.5.5 >= 2.5.5 AMD64

Related bugreports: #152640


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

2.  Impact Information


OpenSSL is a toolkit implementing the Secure Sockets Layer, Transport Layer Security protocols and a general-purpose cryptography library. The x86 emulation base libraries for AMD64 contain a vulnerable version of OpenSSL.


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.


An attacker could trigger the buffer overflow 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


There is no known workaround at this time.


All AMD64 x86 emulation base libraries users should upgrade to the latest version:

Code Listing 3.1: Resolution

# emerge --sync
# emerge --ask --oneshot --verbose ">=app-emulation/emul-linux-x86-baselibs-2.5.5"

4.  References


Page updated December 11, 2006

Summary: This is a Gentoo Linux Security Advisory

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