Description:
===========================================================Ubuntu Security Notice USN-810-3 September 02, 2009nss regressionhttps://launchpad.net/bugs/409864===========================================================A security issue affects the following Ubuntu releases:Ubuntu 8.04 LTSUbuntu 8.10Ubuntu 9.04This advisory also applies to the corresponding versions ofKubuntu, Edubuntu, and Xubuntu.The problem can be corrected by upgrading your system to thefollowing package versions:Ubuntu 8.04 LTS: libnss3-1d 3.12.3.1-0ubuntu0.8.04.2Ubuntu 8.10: libnss3-1d 3.12.3.1-0ubuntu0.8.10.2Ubuntu 9.04: libnss3-1d 3.12.3.1-0ubuntu0.9.04.2After a standard system upgrade you need to restart any applications thatuse NSS, such as Firefox, to effect the necessary changes.Details follow:USN-810-1 fixed vulnerabilities in NSS. Jozsef Kadlecsik noticed thatthe new libraries on amd64 did not correctly set stack memory flags,and caused applications using NSS (e.g. Firefox) to have an executablestack. This reduced the effectiveness of some defensive securityprotections. This update fixes the problem.We apologize for the inconvenience.Original advisory details: Moxie Marlinspike discovered that NSS did not properly handle regular expressions in certificate names. A remote attacker could create a specially crafted certificate to cause a denial of service (via application crash) or execute arbitrary code as the user invoking the program. (CVE-2009-2404) Moxie Marlinspike and Dan Kaminsky independently discovered that NSS did not properly handle certificates with NULL characters in the certificate name. An attacker could exploit this to perform a man in the middle attack to view sensitive information or alter encrypted communications. (CVE-2009-2408) Dan Kaminsky discovered NSS would still accept certificates with MD2 hash signatures. As a result, an attacker could potentially create a malicious trusted certificate to impersonate another site. (CVE-2009-2409)





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