6.5
MEDIUM
CVE-2019-16215
Zulip Server Regular Expression Denial of Service (DoS)
Description

The Markdown parser in Zulip server before 2.0.5 used a regular expression vulnerable to exponential backtracking. A user who is logged into the server could send a crafted message causing the server to spend an effectively arbitrary amount of CPU time and stall the processing of future messages.

INFO

Published Date :

Sept. 18, 2019, 12:15 p.m.

Last Modified :

Feb. 8, 2024, 8:28 p.m.

Remotely Exploitable :

Yes !

Impact Score :

3.6

Exploitability Score :

2.8
Affected Products

The following products are affected by CVE-2019-16215 vulnerability. Even if cvefeed.io is aware of the exact versions of the products that are affected, the information is not represented in the table below.

ID Vendor Product Action
1 Zulip zulip_server
References to Advisories, Solutions, and Tools

Here, you will find a curated list of external links that provide in-depth information, practical solutions, and valuable tools related to CVE-2019-16215.

URL Resource
https://blog.zulip.org/2019/09/11/zulip-server-2-0-5-security-release/ Vendor Advisory
https://github.com/zulip/zulip/commit/5797f013b3be450c146a4141514bda525f2f1b51 Patch Third Party Advisory

We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).

Results are limited to the first 15 repositories due to potential performance issues.

The following list is the news that have been mention CVE-2019-16215 vulnerability anywhere in the article.

The following table lists the changes that have been made to the CVE-2019-16215 vulnerability over time.

Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.

  • CVE Modified by [email protected]

    May. 14, 2024

    Action Type Old Value New Value
  • Reanalysis by [email protected]

    Feb. 08, 2024

    Action Type Old Value New Value
    Removed CWE NIST CWE-400
    Added CWE NIST CWE-1333
  • Initial Analysis by [email protected]

    Sep. 18, 2019

    Action Type Old Value New Value
    Added CVSS V2 NIST (AV:N/AC:L/Au:S/C:N/I:N/A:P)
    Added CVSS V3.1 NIST AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
    Changed Reference Type https://blog.zulip.org/2019/09/11/zulip-server-2-0-5-security-release/ No Types Assigned https://blog.zulip.org/2019/09/11/zulip-server-2-0-5-security-release/ Vendor Advisory
    Changed Reference Type https://github.com/zulip/zulip/commit/5797f013b3be450c146a4141514bda525f2f1b51 No Types Assigned https://github.com/zulip/zulip/commit/5797f013b3be450c146a4141514bda525f2f1b51 Patch, Third Party Advisory
    Added CWE CWE-400
    Added CPE Configuration OR *cpe:2.3:a:zulip:zulip_server:*:*:*:*:*:*:*:* versions up to (excluding) 2.0.5
EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days. Following chart shows the EPSS score history of the vulnerability.
CWE - Common Weakness Enumeration

While CVE identifies specific instances of vulnerabilities, CWE categorizes the common flaws or weaknesses that can lead to vulnerabilities. CVE-2019-16215 is associated with the following CWEs:

Common Attack Pattern Enumeration and Classification (CAPEC)

Common Attack Pattern Enumeration and Classification (CAPEC) stores attack patterns, which are descriptions of the common attributes and approaches employed by adversaries to exploit the CVE-2019-16215 weaknesses.

Exploit Prediction

EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days.

0.08 }} 0.00%

score

0.33067

percentile

CVSS31 - Vulnerability Scoring System
Attack Vector
Attack Complexity
Privileges Required
User Interaction
Scope
Confidentiality
Integrity
Availability