#VU11665 Deserialization of untrusted data in Password Vault Web Access - CVE-2018-9843

Vulnerability identifier: #VU11665

Vulnerability risk: High

CVSSv4.0: 8.9 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:P/U:Amber]

CVE-ID: CVE-2018-9843

CWE-ID: CWE-502

Exploitation vector: Network

Exploit availability: Yes

Vulnerable software:
Password Vault Web Access
Web applications / Remote management & hosting panels

Vendor: CyberArk

Description
The vulnerability allows a remote attacker to execute arbitrary code on the target system.

The weakness exists due to use of authentication tokens which consist of serialized .NET objects. A remote attacker can submit specially crafted tokens, trigger deserialization of untrusted data and execute arbitrary code with privileges of the web application.

Successful exploitation of the vulnerability may result in system compromise.

Mitigation
Update to version 9.9.5, 9.10.1, 10.2.

Vulnerable software versions

Password Vault Web Access: All versions

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External links
https://www.redteam-pentesting.de/de/advisories/rt-sa-2017-014/-cyberark-password-vault-web-access-remote-code-execution

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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability. However, proof of concept for this vulnerability is available.