SynopsisThe remote Ubuntu host is missing a security-related patch.
DescriptionUSN-810-1 fixed vulnerabilities in NSS. Jozsef Kadlecsik noticed that the new libraries on amd64 did not correctly set stack memory flags, and caused applications using NSS (e.g. Firefox) to have an executable stack. This reduced the effectiveness of some defensive security protections. This update fixes the problem.
We apologize for the inconvenience.
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.
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).
Note that Tenable Network Security has extracted the preceding description block directly from the Ubuntu security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.
SolutionUpdate the affected libnss3-1d package.