Bug 1921989 (CVE-2021-20237) - CVE-2021-20237 zeromq: Memory leaks via metadata messages processed by PUB sockets
Summary: CVE-2021-20237 zeromq: Memory leaks via metadata messages processed by PUB so...
Keywords:
Status: CLOSED WONTFIX
Alias: CVE-2021-20237
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
low
low
Target Milestone: ---
Assignee: Red Hat Product Security
QA Contact:
URL:
Whiteboard:
Depends On: 1921990 1921994 1921992 1921993
Blocks: 1921995
TreeView+ depends on / blocked
 
Reported: 2021-01-29 00:46 UTC by Pedro Sampaio
Modified: 2021-02-23 14:05 UTC (History)
23 users (show)

Fixed In Version: zeromq 4.3.3
Doc Type: If docs needed, set a value
Doc Text:
An uncontrolled resource consumption (memory leak) flaw was found in ZeroMQ's src/xpub.cpp. This flaw allows a remote unauthenticated attacker to send crafted PUB messages that consume excessive memory if the CURVE/ZAP authentication is disabled on the server, causing a denial of service. The highest threat from this vulnerability is to system availability.
Clone Of:
Environment:
Last Closed: 2021-02-11 22:09:52 UTC
Embargoed:

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Description Pedro Sampaio 2021-01-29 00:46:57 UTC 
A flaw was found in zeromq before 4.3.3. Messages with metadata are never processed by PUB sockets, but the metadata is kept referenced in the PUB object and never freed leading to memory leaks.

References:

https://github.com/zeromq/libzmq/pull/3935
https://github.com/zeromq/libzmq/security/advisories/GHSA-4p5v-h92w-6wxw
https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=22344
Comment 1 Pedro Sampaio 2021-01-29 00:47:52 UTC 
Created zeromq tracking bugs for this issue:

Affects: epel-all [bug 1921994]
Affects: fedora-all [bug 1921992]
Affects: openstack-rdo [bug 1921993]


Created zeromq3 tracking bugs for this issue:

Affects: epel-7 [bug 1921990]
Comment 2 Denis Arnaud 2021-01-30 00:16:09 UTC 
Fixed by https://bodhi.fedoraproject.org/updates/FEDORA-2021-a01e258e6d
Comment 3 Fedora Update System 2021-02-08 01:29:42 UTC 
FEDORA-2021-8b3202b783 has been pushed to the Fedora 33 stable repository.
If problem still persists, please make note of it in this bug report.
Comment 5 Todd Cullum 2021-02-12 20:41:47 UTC 
External References:

https://github.com/zeromq/libzmq/security/advisories/GHSA-4p5v-h92w-6wxw
Comment 6 Fedora Update System 2021-02-17 04:16:05 UTC 
FEDORA-EPEL-2021-5e4b80b9d8 has been pushed to the Fedora EPEL 8 stable repository.
If problem still persists, please make note of it in this bug report.
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