#VU12916 Race condition in FlowSsh Library

Vulnerability identifier: #VU12916

Vulnerability risk: Low

CVSSv4.0: 1.3 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: N/A

CWE-ID: CWE-362

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
FlowSsh Library
Universal components / Libraries / Libraries used by multiple products

Vendor: Bitvise

Description
The vulnerability allows a remote authenticated attacker to cause DoS condition on the target system.

The weakness exists in a zlib compression library component due to race condition. A remote attacker can corrupt decompressed data in a different user's session and cause the service to crash.

Mitigation
Update to version 7.41.

Vulnerable software versions

FlowSsh Library: 5.27 - 7.39

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External links
https://www.bitvise.com/flowssh-version-history#security-notification-741

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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.