Several security issues were fixed in Ruby.
Jean-Philippe Aumasson discovered that Ruby incorrectly generated predictable hash values. An attacker could use this issue to generate hash collisions and cause a denial of service. (CVE-2012-5371)
21 February 2013
A security issue affects these releases of Ubuntu and its derivatives:
Several security issues were fixed in Ruby.
Jean-Philippe Aumasson discovered that Ruby incorrectly generated predictable hash values. An attacker could use this issue to generate hash collisions and cause a denial of service. (CVE-2012-5371)
Evgeny Ermakov discovered that documentation generated by rdoc is vulnerable to a cross-site scripting issue. With cross-site scripting vulnerabilities, if a user were tricked into viewing a specially crafted page, a remote attacker could exploit this to modify the contents, or steal confidential data, within the same domain. (CVE-2013-0256)
Thomas Hollstegge and Ben Murphy discovered that the JSON implementation in Ruby incorrectly handled certain crafted documents. An attacker could use this issue to cause a denial of service or bypass certain protection mechanisms. (CVE-2013-0269)
The problem can be corrected by updating your system to the following package versions:
To update your system, please follow these instructions: https://wiki.ubuntu.com/Security/Upgrades.
In general, a standard system update will make all the necessary changes.
Vulmon