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Debian Security Advisory DSA-2309-1                   security@debian.org
https://www.debian.org/security/                          Raphael Geissert
September 13, 2011                     https://www.debian.org/security/faq
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Package        : openssl
Vulnerability  : compromised certificate authority
Problem type   : remote
Debian-specific: no
CVE ID         : CVE-2011-1945

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 overrride
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.

Further information about Debian Security Advisories, how to apply
these updates to your system and frequently asked questions can be
found at: https://www.debian.org/security/

Mailing list: debian-security-announce@lists.debian.org
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