Zulip Server up to 2.0.4 Markdown Parser Message resource consumption

CVSS Meta Temp Score
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CTI Interest Score
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5.3$0-$5k0.00

A vulnerability, which was classified as problematic, was found in Zulip Server up to 2.0.4. Affected is an unknown function of the component Markdown Parser. The manipulation as part of a Message leads to a resource consumption vulnerability. CWE is classifying the issue as CWE-400. The product does not properly control the allocation and maintenance of a limited resource, thereby enabling an actor to influence the amount of resources consumed, eventually leading to the exhaustion of available resources. This is going to have an impact on availability. CVE summarizes:

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.

The weakness was published 09/18/2019 (Website). The advisory is shared for download at blog.zulip.org. This vulnerability is traded as CVE-2019-16215 since 09/11/2019. The exploitability is told to be easy. It is possible to launch the attack remotely. The successful exploitation requires a authentication. There are neither technical details nor an exploit publicly available. The MITRE ATT&CK project declares the attack technique as T1499.

Upgrading to version 2.0.5 eliminates this vulnerability.

Similar entry is available at 141961.

Productinfo

Vendor

Name

Version

License

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB CVSS-B Score: 🔍
VulDB CVSS-BT Score: 🔍
VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 5.4
VulDB Meta Temp Score: 5.3

VulDB Base Score: 4.3
VulDB Temp Score: 4.1
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 6.5
NVD Vector: 🔍

CVSSv2info

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VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

NVD Base Score: 🔍

Exploitinginfo

Class: Resource consumption
CWE: CWE-400 / CWE-404
ATT&CK: T1499

Local: No
Remote: Yes

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔍

Upgrade: Server 2.0.5
Patch: github.com

Timelineinfo

09/11/2019 🔍
09/18/2019 +7 days 🔍
09/19/2019 +1 days 🔍
12/26/2023 +1559 days 🔍

Sourcesinfo

Advisory: 5797f013b3be450c146a4141514bda525f2f1b51
Status: Not defined
Confirmation: 🔍

CVE: CVE-2019-16215 (🔍)
See also: 🔍

Entryinfo

Created: 09/19/2019 01:12 PM
Updated: 12/26/2023 10:57 AM
Changes: 09/19/2019 01:12 PM (58), 08/30/2020 10:20 AM (1), 12/26/2023 10:57 AM (5)
Complete: 🔍

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