Debian Security Advisory

DSA-2309-1 openssl -- compromised certificate authority

Date Reported:
13 Sep 2011
Affected Packages:
Security database references:
In Mitre's CVE dictionary: CVE-2011-1945.
More information:

Several fraudulent SSL certificates have been found in the wild issued by the DigiNotar Certificate Authority, obtained through a security compromise of said company. After further updates on this incident, it has been determined that all of DigiNotar's signing certificates can no longer be trusted. Debian, like other software distributors and vendors, has decided to distrust all of DigiNotar's CAs. In this update, this is done in the crypto library (a component of the OpenSSL toolkit) by marking such certificates as revoked. Any application that uses said component should now reject certificates signed by DigiNotar. Individual applications may allow users to override the validation failure. However, making exceptions is highly discouraged and should be carefully verified.

Additionally, a vulnerability has been found in the ECDHE_ECDS cipher where timing attacks make it easier to determine private keys. The Common Vulnerabilities and Exposures project identifies it as CVE-2011-1945.

For the oldstable distribution (lenny), these problems have been fixed in version 0.9.8g-15+lenny12.

For the stable distribution (squeeze), these problems have been fixed in version 0.9.8o-4squeeze2.

For the testing distribution (wheezy), these problems will be fixed soon.

For the unstable distribution (sid), these problems have been fixed in version 1.0.0e-1.

We recommend that you upgrade your openssl packages.