Debian alert DLA-1701-1 (openssl)

From:
             
 
Markus Koschany <apo@debian.org> 
To:
             
 
debian-lts-announce@lists.debian.org 
Subject:
             
 
[SECURITY] [DLA 1701-1] openssl security update 
Date:
             
 
Fri, 1 Mar 2019 23:55:06 +0100
Message-ID:
             
 
<8163c803-38e1-61b7-3d3a-da7ed0fcb305@debian.org>
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Package        : openssl
Version        : 1.0.1t-1+deb8u11
CVE ID         : CVE-2019-1559

Juraj Somorovsky, Robert Merget and Nimrod Aviram discovered a padding
oracle attack in OpenSSL.

If an application encounters a fatal protocol error and then calls
SSL_shutdown() twice (once to send a close_notify, and once to receive
one) then OpenSSL can respond differently to the calling application
if a 0 byte record is received with invalid padding compared to if a 0
byte record is received with an invalid MAC. If the application then
behaves differently based on that in a way that is detectable to the
remote peer, then this amounts to a padding oracle that could be used
to decrypt data.

In order for this to be exploitable "non-stitched" ciphersuites must
be in use. Stitched ciphersuites are optimised implementations of
certain commonly used ciphersuites. Also the application must call
SSL_shutdown() twice even if a protocol error has occurred
(applications should not do this but some do anyway).
AEAD ciphersuites are not impacted.

For Debian 8 "Jessie", this problem has been fixed in version
1.0.1t-1+deb8u11.

We recommend that you upgrade your openssl packages.

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