VDB-243171 · CVE-2021-26738 · GCVE-0-2021-26738

Zscaler Client Connector up to 3.6 on macOS Variable PATH untrusted search path

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.
7.6	$0-$5k	0.00

Summaryinfo

A vulnerability was found in Zscaler Client Connector up to 3.6 on macOS. It has been classified as critical. Impacted is an unknown function of the component Variable Handler. Performing a manipulation of the argument PATH results in untrusted search path. This vulnerability is identified as CVE-2021-26738. The attack is only possible with local access. There is not any exploit available. Upgrading the affected component is recommended.

Detailsinfo

A vulnerability classified as critical has been found in Zscaler Client Connector up to 3.6 on macOS. This affects an unknown code block of the component Variable Handler. The manipulation of the argument PATH with an unknown input leads to a untrusted search path vulnerability. CWE is classifying the issue as CWE-426. The product searches for critical resources using an externally-supplied search path that can point to resources that are not under the product's direct control. This is going to have an impact on confidentiality, integrity, and availability. The summary by CVE is:

Zscaler Client Connector for macOS prior to 3.7 had an unquoted search path vulnerability via the PATH variable. A local adversary may be able to execute code with root privileges.

The weakness was released 10/23/2023. It is possible to read the advisory at help.zscaler.com. This vulnerability is uniquely identified as CVE-2021-26738 since 02/05/2021. Technical details of the vulnerability are known, but there is no available exploit. The attack technique deployed by this issue is T1574 according to MITRE ATT&CK.

Upgrading to version 3.7 eliminates this vulnerability. The upgrade is hosted for download at help.zscaler.com.

Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

Productinfo

Vendor

Zscaler

Name

Client Connector

Version

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 7.8
VulDB Meta Temp Score: 7.6

VulDB Base Score: 7.8
VulDB Temp Score: 7.5
VulDB Vector: 🔍
VulDB Reliability: 🔍

CNA Base Score: 7.8
CNA Vector (Zscaler, 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: Untrusted search path
CWE: CWE-426
CAPEC: 🔍
ATT&CK: 🔍

Physical: Partially
Local: Yes
Remote: No

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: Client Connector 3.7

Timelineinfo

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

Sourcesinfo

Advisory: help.zscaler.com
Status: Confirmed

CVE: CVE-2021-26738 (🔍)
GCVE (CVE): GCVE-0-2021-26738
GCVE (VulDB): GCVE-100-243171

Entryinfo

Created: 10/23/2023 16:56
Changes: 10/23/2023 16:56 (52)
Complete: 🔍
Cache ID: 216::103