USN-810-2: NSPR update

Releases

• Ubuntu 9.04
• Ubuntu 8.10
• Ubuntu 8.04

Packages

• nspr -

Details

USN-810-1 fixed vulnerabilities in NSS. This update provides the NSPR
needed to use the new NSS.

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 machine-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)

Update instructions

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

Ubuntu 9.04

• libnspr4-0d - 4.7.5-0ubuntu0.9.04.1

Ubuntu 8.10

• libnspr4-0d - 4.7.5-0ubuntu0.8.10.1

Ubuntu 8.04

• libnspr4-0d - 4.7.5-0ubuntu0.8.04.1

After a standard system upgrade you need to restart any applications that
use NSPR, such as Firefox, to effect the necessary changes.

References

• https://launchpad.net/bugs/387745