PT-2019-14585 · Zulip · Zulip Server

Published 2019-09-18 · Updated 2024-02-08 · CVE-2019-16215

Positive Technologies (AI Summary)

CVSS v3.1

6.5

Medium

Base vector

AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Name of the Vulnerable Software and Affected Versions Zulip server versions prior to 2.0.5

Description The issue concerns the Markdown parser in the Zulip server, which used a regular expression vulnerable to exponential backtracking. This could allow a logged-in user to send a crafted message, causing the server to spend an arbitrary amount of CPU time and stall the processing of future messages.

Recommendations For versions prior to 2.0.5, update to version 2.0.5 or later to resolve the issue.

Fix

DoS

Weakness Enumeration

CWE-1333

Related Identifiers

CVE-2019-16215

Affected Products

Zulip Server

References · 4

• https://github.com/zulip/zulip/commit/5797f013b3be450c146a4141514bda525f2f1b51 · Patch
• https://blog.zulip.org/2019/09/11/zulip-server-2-0-5-security-release · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2019-16215 · Security Note
• https://osv.dev/vulnerability/CVE-2019-16215 · Vendor Advisory