Bug 1960343 (CVE-2021-32920) - CVE-2021-32920 prosody: DoS via repeated TLS renegotiation causing excessive CPU consumption
Summary: CVE-2021-32920 prosody: DoS via repeated TLS renegotiation causing excessive ...
Keywords:
Status: CLOSED UPSTREAM
Alias: CVE-2021-32920
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
medium
medium
Target Milestone: ---
Assignee: Red Hat Product Security
QA Contact:
URL:
Whiteboard:
Depends On: 1960344 1960357
Blocks:
TreeView+ depends on / blocked
 
Reported: 2021-05-13 17:14 UTC by Guilherme de Almeida Suckevicz
Modified: 2021-05-13 20:33 UTC (History)
2 users (show)

Fixed In Version:
Clone Of:
Environment:
Last Closed: 2021-05-13 20:33:48 UTC
Embargoed:

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Description Guilherme de Almeida Suckevicz 2021-05-13 17:14:09 UTC 
It was discovered that Prosody does not disable SSL/TLS renegotiation, even though this is not used in XMPP. A malicious client may flood a connection with renegotiation requests to consume excessive CPU resources on the server.
Support for disabling renegotiation depends on OpenSSL 1.1.1+ and LuaSec 0.7+.

The default configuration is susceptible to this issue.

Reference:
https://prosody.im/security/advisory_20210512/
Comment 1 Guilherme de Almeida Suckevicz 2021-05-13 17:14:23 UTC 
Created prosody tracking bugs for this issue:

Affects: fedora-all [bug 1960344]
Comment 2 Robert Scheck 2021-05-13 17:15:23 UTC 
Well, this also affects epel-all
Comment 3 Guilherme de Almeida Suckevicz 2021-05-13 17:22:30 UTC 
Created prosody tracking bugs for this issue:

Affects: epel-all [bug 1960357]
Comment 4 Product Security DevOps Team 2021-05-13 20:33:48 UTC 
This CVE Bugzilla entry is for community support informational purposes only as it does not affect a package in a commercially supported Red Hat product. Refer to the dependent bugs for status of those individual community products.
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