CVE-2018-9843

The REST API in CyberArk Password Vault Web Access before 9.9.5 and 10.x before 10.1 allows remote attackers to execute arbitrary code via a serialized .NET object in an Authorization HTTP header.

Weakness

The product deserializes untrusted data without sufficiently ensuring that the resulting data will be valid.

Affected Software

Potential Mitigations

• Make fields transient to protect them from deserialization.
• An attempt to serialize and then deserialize a class containing transient fields will result in NULLs where the transient data should be. This is an excellent way to prevent time, environment-based, or sensitive variables from being carried over and used improperly.

Related Attack Patterns

• https://cwe.mitre.org/data/definitions/586.html

References

• http://seclists.org/fulldisclosure/2018/Apr/18
• http://www.securityfocus.com/archive/1/541932/100/0/threaded
• http://www.securitytracker.com/id/1040675
• https://www.exploit-db.com/exploits/44429/
• https://www.redteam-pentesting.de/en/advisories/rt-sa-2017-014/-cyberark-password-vault-web-access-remote-code-execution
• http://seclists.org/fulldisclosure/2018/Apr/18
• http://www.securityfocus.com/archive/1/541932/100/0/threaded
• http://www.securitytracker.com/id/1040675
• https://www.exploit-db.com/exploits/44429/
• https://www.redteam-pentesting.de/en/advisories/rt-sa-2017-014/-cyberark-password-vault-web-access-remote-code-execution