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Bug 1904459 - CVE-2021-20201 spice: OpenSSL(TLS/SSL) Security DoS Vulnerability - enables client-initiated renegotiation [rhel-8]
Summary: CVE-2021-20201 spice: OpenSSL(TLS/SSL) Security DoS Vulnerability - enables c...
Alias: None
Product: Red Hat Enterprise Linux 8
Classification: Red Hat
Component: spice
Version: ---
Hardware: Unspecified
OS: Unspecified
Target Milestone: rc
: 8.0
Assignee: Julien Ropé
QA Contact: SPICE QE bug list
Depends On:
Blocks: CVE-2021-20201
TreeView+ depends on / blocked
Reported: 2020-12-04 14:21 UTC by Julien Ropé
Modified: 2021-05-18 16:09 UTC (History)
5 users (show)

Fixed In Version: spice-0.14.3-4.el8
Doc Type: If docs needed, set a value
Doc Text:
Clone Of:
Last Closed: 2021-05-18 16:09:30 UTC
Type: Bug
Target Upstream Version:

Attachments (Terms of Use)

System ID Private Priority Status Summary Last Updated
Red Hat Product Errata RHSA-2021:1924 0 None None None 2021-05-18 16:09:37 UTC

Description Julien Ropé 2020-12-04 14:21:34 UTC
Description of problem:
First reported here: https://gitlab.freedesktop.org/spice/spice/-/issues/49

When using TLS to secure the communication to the VM, SPICE is allowing client-initiated renegotiation of ciphers, which can be used to trigger a DoS attack on the host (see https://nvd.nist.gov/vuln/detail/CVE-2011-1473)

How reproducible:
Using the testssl.sh script (from https://testssl.sh/), you can check the vulnerability of a service.

Steps to Reproduce:
1. Setup secure connexion on a SPICE VM using TLS
2. Use testssl.sh to check for the vulnerability

Actual results:
testssl.sh reports the following:

Secure Client-Initiated Renegotiation     VULNERABLE (NOT ok), potential DoS threat

Expected results:

Secure Client-Initiated Renegotiation     likely not vulnerable (OK), timed out

Comment 9 errata-xmlrpc 2021-05-18 16:09:30 UTC
Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory (Low: spice security update), and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.


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