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AUSCERT External Security Bulletin Redistribution
Authentication bypass patched in AsyncSSH 1.12.1
10 December 2018
AusCERT Security Bulletin Summary
Operating System: UNIX variants (UNIX, Linux, OSX)
Impact/Access: Unauthorised Access -- Remote/Unauthenticated
CVE Names: CVE-2018-7749
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AsyncSSH version 1.12.1 is now available on Github and PyPI, with new features
and enhancements, and an important security fix for those using AsyncSSH
server functionality. If you are using AsyncSSH as an SSH server, I strongly
encourage you to upgrade to this release.
Here's a list of changes since 1.12.0:
* Implemented a fix for CVE-2018-7749, where a modified SSH client could
request that an AsyncSSH server perform operations before authentication
had completed. Thanks go to Matthijs Kooijman for discovering and
reporting this issue and helping to review the fix.
* Added a non-blocking collect_output() method to SSHClientProcess to
allow applications to retrieve data received on an output stream
without blocking. This call can be called multiple times and freely
intermixed with regular read calls with a guarantee that output will
always be returned in order and without duplication.
* Updated debug logging implementation to make it more maintainable, and
to fix an issue where unprocessed packets were not logged in some cases.
* Extended the support below for non-ASCII characters in comments to apply
to X.509 certificates, allowing an optional encoding to be passed in to
get_comment() and set_comment() and a get_comment_bytes() function to
get the raw comment bytes without performing Unicode decoding.
* Fixed an issue where a UnicodeDecodeError could be reported in some
cases instead of a KeyEncryptionError when a private key was imported
using the wrong passphrase.
* Fixed the reporting of the MAC algorithm selected during key exchange to
properly report the cipher name for GCM and Chacha ciphers that don't
use a separate MAC algorithm. The correct value was being returned in
queries after the key exchange was complete, but the logging was being
done before this adjustment was made.
* Fixed the documentation of connection_made() in SSHSession subclasses
to properly reflect the type of SSHChannel objects passed to them.
Downloads can be found in the usual place:
Home page: http://asyncssh.readthedocs.io
Please let me know if you have any questions or problems with this new release!
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