ActFax 7.10 Build 0335 Folder Permission TSClientB.exe privileges management

Summaryinfo

A vulnerability classified as critical has been found in ActFax 7.10 Build 0335. Affected is an unknown function of the file TSClientB.exe of the component Folder Permission. Performing a manipulation results in privileges management. This vulnerability was named CVE-2020-15843. The attack needs to be approached locally. There is no available exploit.

Detailsinfo

A vulnerability was found in ActFax 7.10 Build 0335. It has been classified as critical. This affects some unknown processing of the file TSClientB.exe of the component Folder Permission. The manipulation with an unknown input leads to a privileges management vulnerability. CWE is classifying the issue as CWE-269. The product does not properly assign, modify, track, or check privileges for an actor, creating an unintended sphere of control for that actor. This is going to have an impact on confidentiality, integrity, and availability. The summary by CVE is:

ActFax Version 7.10 Build 0335 (2020-05-25) is susceptible to a privilege escalation vulnerability due to insecure folder permissions on %PROGRAMFILES%\ActiveFax\Client\, %PROGRAMFILES%\ActiveFax\Install\ and %PROGRAMFILES%\ActiveFax\Terminal\. The folder permissions allow "Full Control" to "Everyone". An authenticated local attacker can exploit this to replace the TSClientB.exe binary in the Terminal directory, which is executed on logon for every user. Alternatively, the attacker can replace any of the binaries in the Client or Install directories. The latter requires additional user interaction, for example starting the client.

The weakness was presented 09/24/2020. This vulnerability is uniquely identified as CVE-2020-15843 since 07/20/2020. An attack has to be approached locally. Required for exploitation is a authentication. Technical details are known, but no exploit is available. MITRE ATT&CK project uses the attack technique T1068 for this issue.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

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Productinfo

Name

• ActFax

Version

• 7.10 Build 0335

CPE 2.3info

• 🔍

CPE 2.2info

• 🔍

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