#VU58341 Arbitrary file upload in CommCell - CVE-2021-34997

Vulnerability identifier: #VU58341

Vulnerability risk: Medium

CVSSv4.0: 6.3 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2021-34997

CWE-ID: CWE-434

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
CommCell
Other software / Other software solutions

Vendor: Commvault

Description

The vulnerability allows a remote attacker to compromise vulnerable system.

The vulnerability exists due to insufficient validation of file during file upload within the AppStudioUploadHandler class. A remote authenticated attacker can upload a malicious file and execute it on the server.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

CommCell: before 11.25

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External links
https://www.zerodayinitiative.com/advisories/ZDI-21-1332/

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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote authenticated user via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.