USN-522-1: openssl vulnerabilities

28 September 2007

openssl vulnerabilities

A security issue affects these releases of Ubuntu and its derivatives:

  • Ubuntu 7.04
  • Ubuntu 6.10
  • Ubuntu 6.06 LTS

Software Description

  • openssl


It was discovered that OpenSSL did not correctly perform Montgomery multiplications. Local attackers might be able to reconstruct RSA private keys by examining another user’s OpenSSL processes. (CVE-2007-3108)

Moritz Jodeit discovered that OpenSSL’s SSL_get_shared_ciphers function did not correctly check the size of the buffer it was writing to. A remote attacker could exploit this to write one NULL byte past the end of an application’s cipher list buffer, possibly leading to arbitrary code execution or a denial of service. (CVE-2007-5135)

Update instructions

The problem can be corrected by updating your system to the following package versions:

Ubuntu 7.04
libssl0.9.8 - 0.9.8c-4ubuntu0.1
Ubuntu 6.10
libssl0.9.8 - 0.9.8b-2ubuntu2.1
Ubuntu 6.06 LTS
libssl0.9.8 - 0.9.8a-7ubuntu0.4

To update your system, please follow these instructions:

After a standard system upgrade you need to reboot your computer to effect the necessary changes.