CVE-2018-20221

Secure/SAService.rem in Deltek Ajera Timesheets 9.10.16 and prior are vulnerable to remote code execution via deserialization of untrusted user input from an authenticated user. The executed code will run as the IIS Application Pool that is running the application.

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://packetstormsecurity.com/files/151035/Ajera-Timesheets-9.10.16-Deserialization.html
• https://www.exploit-db.com/exploits/46086/
• http://packetstormsecurity.com/files/151035/Ajera-Timesheets-9.10.16-Deserialization.html
• https://www.exploit-db.com/exploits/46086/