VDB-193913 · CVE-2021-3967 · GCVE-0-2021-3967

Zulip up to 4.9 access control

CVSS Meta Temp Score CVSS is a standardized scoring system to determine possibilities of attacks. The Temp Score considers temporal factors like disclosure, exploit and countermeasures. The unique Meta Score calculates the average score of different sources to provide a normalized scoring system.	Current Exploit Price (≈) Our analysts are monitoring exploit markets and are in contact with vulnerability brokers. The range indicates the observed or calculated exploit price to be seen on exploit markets. A good indicator to understand the monetary effort required for and the popularity of an attack.	CTI Interest Score Our Cyber Threat Intelligence team is monitoring different web sites, mailing lists, exploit markets and social media networks. The CTI Interest Score identifies the interest of attackers and the security community for this specific vulnerability in real-time. A high score indicates an elevated risk to be targeted for this vulnerability.
4.0	$0-$5k	0.00

Summaryinfo

A vulnerability classified as critical has been found in Zulip up to 4.9. Impacted is an unknown function. The manipulation leads to access control. This vulnerability is listed as CVE-2021-3967. The attack may be initiated remotely. There is no available exploit. It is recommended to upgrade the affected component.

Detailsinfo

A vulnerability was found in Zulip up to 4.9. It has been rated as problematic. This issue affects some unknown processing. The manipulation with an unknown input leads to a access control vulnerability. Using CWE to declare the problem leads to CWE-284. The product does not restrict or incorrectly restricts access to a resource from an unauthorized actor. Impacted is confidentiality, integrity, and availability.

The weakness was presented 02/27/2022. The advisory is shared at huntr.dev. The identification of this vulnerability is CVE-2021-3967 since 11/17/2021. Neither technical details nor an exploit are publicly available. MITRE ATT&CK project uses the attack technique T1068 for this issue.

Upgrading to version 4.10 eliminates this vulnerability. Applying the patch d5db254ca8167995a1654d1c45ffc74b2fade39a is able to eliminate this problem. The bugfix is ready for download at github.com. The best possible mitigation is suggested to be upgrading to the latest version.

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Productinfo

Name

Zulip

Version

License

open-source

Website

Product: https://github.com/zulip/zulip/

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 4.1
VulDB Meta Temp Score: 4.0

VulDB Base Score: 4.1
VulDB Temp Score: 3.9
VulDB Vector: 🔍
VulDB Reliability: 🔍

CNA Base Score: 4.1
CNA Vector (huntr.dev): 🔍

CVSSv2info

AV	AC	Au	C	I	A
💳	💳	💳	💳	💳	💳
💳	💳	💳	💳	💳	💳
💳	💳	💳	💳	💳	💳

Vector	Complexity	Authentication	Confidentiality	Integrity	Availability
Unlock	Unlock	Unlock	Unlock	Unlock	Unlock
Unlock	Unlock	Unlock	Unlock	Unlock	Unlock
Unlock	Unlock	Unlock	Unlock	Unlock	Unlock

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

Exploitinginfo

Class: Access control
CWE: CWE-284 / CWE-266
CAPEC: 🔍
ATT&CK: 🔍

Physical: No
Local: No
Remote: Yes

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

0-Day	Unlock	Unlock	Unlock	Unlock
Today	Unlock	Unlock	Unlock	Unlock

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔍

Upgrade: Zulip 4.10
Patch: d5db254ca8167995a1654d1c45ffc74b2fade39a

Timelineinfo

11/17/2021 🔍
02/27/2022 +102 days 🔍
02/27/2022 +0 days 🔍
03/03/2022 +4 days 🔍

Sourcesinfo

Product: github.com

Advisory: d5db254ca8167995a1654d1c45ffc74b2fade39a
Status: Confirmed

CVE: CVE-2021-3967 (🔍)
GCVE (CVE): GCVE-0-2021-3967
GCVE (VulDB): GCVE-100-193913

Entryinfo

Created: 02/27/2022 08:15
Updated: 03/03/2022 09:00
Changes: 02/27/2022 08:15 (49), 03/03/2022 09:00 (2)
Complete: 🔍
Cache ID: 216::103