PT-2021-4057 · Prosody+2 · Prosody+2

Kim Alvefur · Published 2021-05-02 · Updated 2024-12-08 · CVE-2021-32920

Positive Technologies (AI Summary)

CVSS v2.0

7.8

High

Base vector

AV:N/AC:L/Au:N/C:N/I:N/A:C

Name of the Vulnerable Software and Affected Versions Prosody versions prior to 0.11.9

Description The issue is related to incorrect handling of SSL/TLS renegotiation requests, which can lead to uncontrolled CPU consumption. This can be exploited by a remote attacker to cause a denial of service.

Recommendations For versions prior to 0.11.9, update to version 0.11.9 or later to resolve the issue. As a temporary workaround, consider restricting the number of SSL/TLS renegotiation requests to minimize the risk of exploitation.

Fix

Resource Exhaustion

Weakness Enumeration

CWE-400

Related Identifiers

ALT-PU-2021-1808

ALT-PU-2021-2611

ALT-PU-2024-16554

BDU:2021-04585

CVE-2021-32920

DSA-4916-1

DSA-4916-2

OPENSUSE-SU-2021:0728-1

OPENSUSE-SU-2021:0751-1

OPENSUSE-SU-2021_0728-1

OPENSUSE-SU-2024:11197-1

Affected Products

Alt Linux

Prosody

Suse

References · 37

• https://osv.dev/vulnerability/CVE-2021-32920 · Vendor Advisory
• https://blog.prosody.im/prosody-0.11.9-released · Vendor Advisory
• https://osv.dev/vulnerability/openSUSE-SU-2021:0728-1 · Vendor Advisory
• https://osv.dev/vulnerability/openSUSE-SU-2024:11197-1 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2021-32920 · Security Note
• https://osv.dev/vulnerability/DEBIAN-CVE-2021-32920 · Vendor Advisory
• https://osv.dev/vulnerability/UBUNTU-CVE-2021-32920 · Vendor Advisory
• https://osv.dev/vulnerability/DSA-4916-1 · Vendor Advisory
• https://osv.dev/vulnerability/openSUSE-SU-2021:0751-1 · Vendor Advisory
• https://security-tracker.debian.org/tracker/CVE-2021-32920 · Vendor Advisory
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/LWJ2DG2DFJOEFEWOUN26IMYYWGSA2ZEE · Vendor Advisory
• https://debian.org/security/2021/dsa-4916 · Vendor Advisory
• https://ubuntu.com/security/CVE-2021-32920 · Vendor Advisory
• https://osv.dev/vulnerability/DSA-4916-2 · Vendor Advisory
• https://bdu.fstec.ru/vul/2021-04585 · Security Note