Zulip Server up to 2.1.2 Markdown improper restriction of rendered ui layers

EntryeditHistoryDiffjsonxmlCTI

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.
5.8	$0-$5k	0.00

A vulnerability, which was classified as critical, has been found in Zulip Server up to 2.1.2. Affected by this issue is an unknown part. The manipulation as part of a Markdown leads to a privilege escalation vulnerability. Using CWE to declare the problem leads to CWE-269. Impacted is confidentiality, and integrity. CVE summarizes:

Zulip Server before 2.1.3 allows reverse tabnabbing via the Markdown functionality.

The weakness was released 04/20/2020 (Website). The advisory is shared for download at blog.zulip.org. This vulnerability is handled as CVE-2020-9444 since 02/28/2020. The attack may be launched remotely. No form of authentication is required for exploitation. Successful exploitation requires user interaction by the victim. There are neither technical details nor an exploit publicly available.

Upgrading to version 2.1.3 eliminates this vulnerability.

Entries connected to this vulnerability are available at 154108 and 154137.

Productinfoedit

Vendor

Zulip

Name

Server

CPE 2.3infoedit

CPE 2.2infoedit

CVSSv3infoedit

VulDB Meta Base Score: 6.1
VulDB Meta Temp Score: 5.9

VulDB Base Score: 6.1
VulDB Temp Score: 5.8
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 6.1
NVD Vector: 🔍

CVSSv2infoedit

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: 🔍

NVD Base Score: 🔍

Exploitinginfoedit

Class: Privilege escalation
CWE: CWE-1021
ATT&CK: Unknown

Local: No
Remote: Yes

Availability: 🔍
Status: Not defined
Price Prediction: 🔍
Current Price Estimation: 🔍

0-Day	unlock	unlock	unlock	unlock
Today	unlock	unlock	unlock	unlock

Threat Intelligenceinfoedit

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

Countermeasuresinfoedit

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔍

Upgrade: Server 2.1.3

Timelineinfoedit

02/28/2020 🔍
04/20/2020 +52 days 🔍
04/21/2020 +1 days 🔍
10/10/2020 +172 days 🔍

Sourcesinfoedit

Advisory: blog.zulip.org
Status: Not defined
Confirmation: 🔍

CVE: CVE-2020-9444 (🔍)
See also: 🔍

Entryinfoedit

Created: 04/21/2020 09:37 AM
Updated: 10/10/2020 05:41 PM
Changes: (1) advisory_confirm_url
Complete: 🔍