CVE-2018-17057

An issue was discovered in TCPDF before 6.2.22. Attackers can trigger deserialization of arbitrary data via the phar:// wrapper.

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/152200/TCPDF-6.2.19-Deserialization-Remote-Code-Execution.html
• http://packetstormsecurity.com/files/152360/LimeSurvey-Deserialization-Remote-Code-Execution.html
• http://seclists.org/fulldisclosure/2019/Mar/36
• https://contao.org/en/news/security-vulnerability-cve-2018-17057.html
• https://github.com/LimeSurvey/LimeSurvey/commit/1cdd78d27697b3150bb44aaa7af1a81062a591a5
• https://github.com/tecnickcom/TCPDF/commit/1861e33fe05f653b67d070f7c106463e7a5c26ed
• https://www.exploit-db.com/exploits/46634/
• http://packetstormsecurity.com/files/152200/TCPDF-6.2.19-Deserialization-Remote-Code-Execution.html
• http://packetstormsecurity.com/files/152360/LimeSurvey-Deserialization-Remote-Code-Execution.html
• http://seclists.org/fulldisclosure/2019/Mar/36
• https://contao.org/en/news/security-vulnerability-cve-2018-17057.html
• https://github.com/LimeSurvey/LimeSurvey/commit/1cdd78d27697b3150bb44aaa7af1a81062a591a5
• https://github.com/tecnickcom/TCPDF/commit/1861e33fe05f653b67d070f7c106463e7a5c26ed
• https://www.exploit-db.com/exploits/46634/