VDB-224540 · CVE-2021-41526 · GCVE-0-2021-41526

Flexera InstallShield prior 2021 R2 InstallScript ISBEW64.EXE Local Privilege Escalation

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 categorized as critical has been discovered in Flexera InstallShield. This affects an unknown function of the file ISBEW64.EXE of the component InstallScript. Such manipulation leads to an unknown weakness. This vulnerability is referenced as CVE-2021-41526. The attack can only be performed from a local environment. No exploit is available. It is advisable to upgrade the affected component.

Detailsinfo

A vulnerability was found in Flexera InstallShield. It has been rated as critical. Affected by this issue is an unknown functionality of the file ISBEW64.EXE of the component InstallScript. Impacted is confidentiality, integrity, and availability. CVE summarizes:

A vulnerability has been reported in the windows installer (MSI) built with InstallScript custom action. This vulnerability may allow privilege escalation when invoked ‘repair’ of the MSI which has an InstallScript custom action.

The weakness was published 03/30/2023. The advisory is shared for download at community.flexera.com. This vulnerability is handled as CVE-2021-41526 since 09/20/2021. There are known technical details, but no exploit is available.

Upgrading to version 2021 R2 eliminates this vulnerability.

Once again VulDB remains the best source for vulnerability data.

Productinfo

Vendor

Flexera

Name

InstallShield

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: 🔍

NVD Base Score: 7.8
NVD Vector: 🔍

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: Local Privilege Escalation
CWE: Unknown
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: InstallShield 2021 R2

Timelineinfo

09/20/2021 🔍
03/30/2023 +556 days 🔍
03/30/2023 +0 days 🔍
04/20/2023 +21 days 🔍

Sourcesinfo

Advisory: community.flexera.com
Status: Confirmed

CVE: CVE-2021-41526 (🔍)
GCVE (CVE): GCVE-0-2021-41526
GCVE (VulDB): GCVE-100-224540

Entryinfo

Created: 03/30/2023 11:18
Updated: 04/20/2023 10:07
Changes: 03/30/2023 11:18 (38), 04/20/2023 10:07 (10)
Complete: 🔍
Cache ID: 216::103