ESB-2018.1066 - [Debian] python-crypto: Access privileged data - Remote/unauthenticated 2018-04-10

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===========================================================================
             AUSCERT External Security Bulletin Redistribution

                               ESB-2018.1066
                       python-crypto security update
                               10 April 2018

===========================================================================

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

Product:           python-crypto
Publisher:         Debian
Operating System:  Debian GNU/Linux 7
Impact/Access:     Access Privileged Data -- Remote/Unauthenticated
Resolution:        Patch/Upgrade
CVE Names:         CVE-2018-6594  

Reference:         ESB-2018.0990
                   ESB-2018.0477

Original Bulletin: 
   https://lists.debian.org/debian-lts-announce/2018/04/msg00006.html
   https://lists.debian.org/debian-lts-announce/2018/02/msg00018.html

Comment: This bulletin contains two (2) Debian security advisories.

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Package        : python-crypto
Version        : 2.6-4+deb7u8


This is an update to DLA-1283-1. In DLA-1283-1 it is claimed that the issue
described in CVE-2018-6594 is fixed. It turns out that the fix is partial and
upstream has decided not to fix the issue as it would break compatibility and
that ElGamal encryption was not intended to work on its own.

The recommendation is still to upgrade python-crypto packages. In addition
please take into account that the fix is not complete. If you have an
application using python-crypto is implementing ElGamal encryption you should
consider changing to some other encryption method.

There will be no further update to python-crypto for this specific CVE. A fix
would break compatibility, the problem has been ignored by regular Debian
Security team due to its minor nature and in addition to that we are close to
the end of life of the Wheezy security support.

CVE-2018-6594:

python-crypto generated weak ElGamal key parameters, which allowed attackers to
obtain sensitive information by reading ciphertext data (i.e., it did not have
semantic security in face of a ciphertext-only attack).

We recommend that you upgrade your python-crypto 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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Package        : python-crypto
Version        : 2.6-4+deb7u8
CVE ID         : CVE-2018-6594
Debian Bug     : 889999


python-crypto generated weak ElGamal key parameters, which allowed attackers to
obtain sensitive information by reading ciphertext data (i.e., it did not have
semantic security in face of a ciphertext-only attack).

For Debian 7 "Wheezy", these problems have been fixed in version
2.6-4+deb7u8.

We recommend that you upgrade your python-crypto 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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