Zscaler Client Connector up to 3.5 on macOS origin validation

CVSS Meta Temp Score
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Current Exploit Price (≈)
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CTI Interest Score
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4.5$0-$5k0.00

Summaryinfo

A vulnerability has been found in Zscaler Client Connector up to 3.5 on macOS and classified as problematic. This vulnerability affects unknown code. This manipulation causes origin validation. The identification of this vulnerability is CVE-2021-26737. The attack can only be executed locally. There is no exploit available. The affected component should be upgraded.

Detailsinfo

A vulnerability was found in Zscaler Client Connector up to 3.5 on macOS. It has been declared as problematic. Affected by this vulnerability is an unknown part. The manipulation with an unknown input leads to a origin validation vulnerability. The CWE definition for the vulnerability is CWE-346. The product does not properly verify that the source of data or communication is valid. As an impact it is known to affect availability. The summary by CVE is:

The Zscaler Client Connector for macOS prior to 3.6 did not sufficiently validate RPC clients. A local adversary without sufficient privileges may be able to shutdown the Zscaler tunnel by exploiting a race condition.

The weakness was shared 10/23/2023 by shutdown. The advisory is shared at help.zscaler.com. This vulnerability is known as CVE-2021-26737 since 02/05/2021. Neither technical details nor an exploit are publicly available.

Upgrading to version 3.6 eliminates this vulnerability. The upgrade is hosted for download at help.zscaler.com.

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

Productinfo

Vendor

Name

Version

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 4.5
VulDB Meta Temp Score: 4.5

VulDB Base Score: 3.3
VulDB Temp Score: 3.2
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 4.7
NVD Vector: 🔍

CNA Base Score: 5.5
CNA Vector (Zscaler, Inc.): 🔍

CVSSv2info

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

Exploitinginfo

Class: Origin validation
CWE: CWE-346 / CWE-345
CAPEC: 🔍
ATT&CK: 🔍

Physical: Partially
Local: Yes
Remote: No

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: Client Connector 3.6

Timelineinfo

02/05/2021 🔍
10/23/2023 +989 days 🔍
10/23/2023 +0 days 🔍
11/12/2023 +20 days 🔍

Sourcesinfo

Advisory: help.zscaler.com
Researcher: shutdown
Status: Confirmed

CVE: CVE-2021-26737 (🔍)
GCVE (CVE): GCVE-0-2021-26737
GCVE (VulDB): GCVE-100-243169

Entryinfo

Created: 10/23/2023 16:56
Updated: 11/12/2023 18:37
Changes: 10/23/2023 16:56 (51), 11/12/2023 18:37 (11)
Complete: 🔍
Cache ID: 216::103

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

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