CVE-2020-15166: zeromq/libzmq: Denial-of-Service on CURVE/ZAP-protected servers by unauthenticated clients

[Luca Boccassi <bluca () debian org>]

Hello,

A security vulnerability has been found in libzmq/zeromq.

CVE-2020-15166: Denial-of-Service on CURVE/ZAP-protected servers by
unauthenticated clients.
If a raw TCP socket is opened and connected to an endpoint that is fully
configured with CURVE/ZAP, legitimate clients will not be able to exchange
any message. Handshakes complete successfully, and messages are delivered to
the library, but the server application never receives them.
For more information see the security advisory:
https://github.com/zeromq/libzmq/security/advisories/GHSA-25wp-cf8g-938m

The following upstream releases fix the issue:

https://github.com/zeromq/libzmq/releases/tag/v4.3.3

https://github.com/zeromq/zeromq4-x/releases/tag/v4.0.10

https://github.com/zeromq/zeromq4-1/releases/tag/v4.1.8


Individual backported patches can be found on the upstream bug tracker,
and have been sent separately to the security teams of various
distributions:

https://github.com/zeromq/libzmq/security/advisories/GHSA-25wp-cf8g-938m

-- 
Kind regards,
Luca Boccassi

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