From $URL : A flaw in how TLS/DTLS, when CBC-mode encryption is used, communicates was reported. This vulnerability can allow for a Man-in-the-Middle attacker to recover plaintext from a TLS/DTLS connection, when CBC-mode encryption is used. This flaw is in the TLS specification, and not a bug in a specific implementation (as such, it affects nearly all implementations). As such, it affects all TLS and DTLS implementations that are compliant with TLS 1.1 or 1.2, or with DTLS 1.0 or 1.2. It also applies to implementations of SSL 3.0 and TLS 1.0 that incorporate countermeasures to deal with previous padding oracle attacks. All TLS/DTLS ciphersuites that include CBC-mode encryption are potentially vulnerable. The paper indicates that with OpenSSL, a full plaintext recovery attack is possible, and with GnuTLS, a partial plaintext recovery is possible (recovering up to 4 bits of the last byte in any block of plaintext). To perform a successful attack, when TLS is used, a large number of TLS sessions are required (target plaintext must be sent repeatedly in the same position in the plaintext stream across the sessions). For DTLS, a successful attack can be carried out in a single session. The attacker must also be located close to the machine being attacked. Further details are noted in the paper. Current status of fixes in various implementations: * OpenSSL has a patch in development * NSS has a patch in development * GnuTLS is fixed in versions 2.12.23, 3.0.28, and 3.1.7 * PolarSSL is fixed in version 1.2.5 * BouncyCastle has a patch that will be included in the forthcoming 1.48 version External References: http://www.isg.rhul.ac.uk/tls/ http://www.isg.rhul.ac.uk/tls/TLStiming.pdf http://www.gnutls.org/security.html#GNUTLS-SA-2013-1 https://polarssl.org/tech-updates/releases/polarssl-1.2.5-released
ebuild for version 1.2.5 added to main tree
(In reply to comment #1) > ebuild for version 1.2.5 added to main tree Thanks, Thomas. Arches, please test and mark stable.
amd64 stable
x86 stable
hppa stable
arm stable
ppc stable
ppc64 stable
sparc stable
CVE-2013-1621 (http://nvd.nist.gov/nvd.cfm?cvename=CVE-2013-1621): Array index error in the SSL module in PolarSSL before 1.2.5 might allow remote attackers to cause a denial of service via vectors involving a crafted padding-length value during validation of CBC padding in a TLS session, a different vulnerability than CVE-2013-0169.
GLSA vote: yes.
GLSA vote: yes Added to existing GLSA request.
This issue was resolved and addressed in GLSA 201310-10 at http://security.gentoo.org/glsa/glsa-201310-10.xml by GLSA coordinator Sergey Popov (pinkbyte).
