ESB-2019.0649 - [Debian] openssl: Access privileged data - Remote with user interaction 2019-03-04

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             AUSCERT External Security Bulletin Redistribution

                               ESB-2019.0649
                   [DLA 1701-1] openssl security update
                               4 March 2019

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        AusCERT Security Bulletin Summary
        ---------------------------------

Product:           openssl
Publisher:         Debian
Operating System:  Debian GNU/Linux 8
Impact/Access:     Access Privileged Data -- Remote with User Interaction
Resolution:        Patch/Upgrade
CVE Names:         CVE-2019-1559  

Reference:         ESB-2019.0630
                   ESB-2019.0620

Original Bulletin: 
   https://lists.debian.org/debian-lts-announce/2019/03/msg00003.html

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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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