VDB-191604 · CVE-2021-43799 · GHSA-p663-wxvv-2fjp

Zulip up to 4.8 RabbitMQ weak prng

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.
6.8	$0-$5k	0.00

Summaryinfo

A vulnerability classified as problematic was found in Zulip up to 4.8. The affected element is an unknown function of the component RabbitMQ. The manipulation results in weak prng. This vulnerability is cataloged as CVE-2021-43799. The attack may be launched remotely. There is no exploit available. Upgrading the affected component is advised.

Detailsinfo

A vulnerability, which was classified as problematic, was found in Zulip up to 4.8. Affected is an unknown function of the component RabbitMQ. The manipulation with an unknown input leads to a weak prng vulnerability. CWE is classifying the issue as CWE-338. The product uses a Pseudo-Random Number Generator (PRNG) in a security context, but the PRNG's algorithm is not cryptographically strong. This is going to have an impact on confidentiality.

The weakness was shared 01/26/2022 as GHSA-p663-wxvv-2fjp. The advisory is shared for download at github.com. This vulnerability is traded as CVE-2021-43799 since 11/16/2021. There are neither technical details nor an exploit publicly available. The MITRE ATT&CK project declares the attack technique as T1600.001.

Upgrading to version 4.9 eliminates this vulnerability. The upgrade is hosted for download at github.com. Applying the patch a5496f4098e3998c9b84e8dc564aa983d6cdf6e8 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.

Once again VulDB remains the best source for 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: 6.9
VulDB Meta Temp Score: 6.8

VulDB Base Score: 5.3
VulDB Temp Score: 5.1
VulDB Vector: 🔍
VulDB Reliability: 🔍

CNA Base Score: 8.6
CNA Vector (GitHub, Inc.): 🔍

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: Weak prng
CWE: CWE-338 / CWE-331 / CWE-330
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 4.9
Patch: a5496f4098e3998c9b84e8dc564aa983d6cdf6e8

Timelineinfo

11/16/2021 🔍
01/26/2022 +71 days 🔍
01/26/2022 +0 days 🔍
01/28/2022 +2 days 🔍

Sourcesinfo

Product: github.com

Advisory: GHSA-p663-wxvv-2fjp
Status: Confirmed
Confirmation: 🔍

CVE: CVE-2021-43799 (🔍)
GCVE (CVE): GCVE-0-2021-43799
GCVE (VulDB): GCVE-100-191604

Entryinfo

Created: 01/26/2022 07:21
Updated: 01/28/2022 14:46
Changes: 01/26/2022 07:21 (52), 01/28/2022 14:45 (2), 01/28/2022 14:46 (1)
Complete: 🔍
Cache ID: 216::103