CVE-2022-25845

The package com.alibaba:fastjson before 1.2.83 are vulnerable to Deserialization of Untrusted Data by bypassing the default autoType shutdown restrictions, which is possible under certain conditions. Exploiting this vulnerability allows attacking remote servers. Workaround: If upgrading is not possible, you can enable safeMode.

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

• https://github.com/alibaba/fastjson/commit/35db4adad70c32089542f23c272def1ad920a60d
• https://github.com/alibaba/fastjson/commit/8f3410f81cbd437f7c459f8868445d50ad301f15
• https://github.com/alibaba/fastjson/releases/tag/1.2.83
• https://github.com/alibaba/fastjson/wiki/security_update_20220523
• https://snyk.io/vuln/SNYK-JAVA-COMALIBABA-2859222
• https://www.ddosi.org/fastjson-poc/
• https://www.oracle.com/security-alerts/cpujul2022.html
• https://github.com/alibaba/fastjson/commit/35db4adad70c32089542f23c272def1ad920a60d
• https://github.com/alibaba/fastjson/commit/8f3410f81cbd437f7c459f8868445d50ad301f15
• https://github.com/alibaba/fastjson/releases/tag/1.2.83
• https://github.com/alibaba/fastjson/wiki/security_update_20220523
• https://snyk.io/vuln/SNYK-JAVA-COMALIBABA-2859222
• https://www.ddosi.org/fastjson-poc/
• https://www.oracle.com/security-alerts/cpujul2022.html