Debian Security Advisory

DLA-81-1 openssl -- LTS security update

Date Reported:
01 Nov 2014
Affected Packages:
Security database references:
In Mitre's CVE dictionary: CVE-2014-3567, CVE-2014-3568, CVE-2014-3569.
More information:

Several vulnerabilities have been found in OpenSSL.

  • CVE-2014-3566


    A flaw was found in the way SSL 3.0 handled padding bytes when decrypting messages encrypted using block ciphers in cipher block chaining (CBC) mode. This flaw allows a man-in-the-middle (MITM) attacker to decrypt a selected byte of a cipher text in as few as 256 tries if they are able to force a victim application to repeatedly send the same data over newly created SSL 3.0 connections.

    This update adds support for Fallback SCSV to mitigate this issue. This does not fix the issue. The proper way to fix this is to disable SSL 3.0.

  • CVE-2014-3567

    A memory leak flaw was found in the way an OpenSSL handled failed session ticket integrity checks. A remote attacker could exhaust all available memory of an SSL/TLS or DTLS server by sending a large number of invalid session tickets to that server.

  • CVE-2014-3568

    When OpenSSL is configured with "no-ssl3" as a build option, servers could accept and complete a SSL 3.0 handshake, and clients could be configured to send them.

    Note that the package is Debian is not build with this option.

  • CVE-2014-3569

    When OpenSSL is build with the "no-ssl3" option and a SSL v3 Client Hello is received the ssl method would be set to NULL which could later result in a NULL pointer dereference.

    Note that the package is Debian is not build with this option.

For Debian 6 Squeeze, these issues have been fixed in openssl version 0.9.8o-4squeeze18