CVE-2019-25729

Weakness

PDF Signer 3.0 contains a server-side template injection vulnerability that allows unauthenticated attackers to execute arbitrary code by injecting PHP commands through the CSRF-TOKEN cookie parameter. Attackers can craft malicious cookie values containing template injection payloads like shell_exec() to execute system commands and retrieve sensitive information from the server.

References

• https://codecanyon.net/item/signer-create-digital-signatures-and-sign-pdf-documents-online/20737707
• https://codecanyon.net/user/simcy_creative
• https://www.exploit-db.com/exploits/46276
• https://www.vulncheck.com/advisories/pdf-signer-server-side-template-injection-rce-via-csrf-cookie