Description
Fastjson before 1.2.48 mishandles autoType because, when an @type key is in a JSON document, and the value of that key is the name of a Java class, there may be calls to certain public methods of that class. Depending on the behavior of those methods, there may be JNDI injection with an attacker-supplied payload located elsewhere in that JSON document. This was exploited in the wild in 2023 through 2025. NOTE: this issue exists because of an incomplete fix for CVE-2017-18349. Also, a later bypass is covered by CVE-2022-25845.
CVSS breakdown
CVSS 3.1
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Changed
Confidentiality
High
Integrity
High
Availability
High
Affected products
- Alibaba / Fastjson0 – 1.2.48
References
- MISChttps://github.com/alibaba/fastjson/compare/1.2.47...1.2.48
- MISChttps://www.seebug.org/vuldb/ssvid-98020
- MISChttps://www.cnvd.org.cn/flaw/show/CNVD-2019-22238
- MISChttps://www.freebuf.com/vuls/208339.html
- MISChttps://github.com/vulhub/vulhub/tree/master/fastjson/1.2.47-rce
- MISChttps://www.cloudsek.com/blog/androxgh0st-continues-exploitation-operators-compromise-a-us-university-for-hosting-c2-logger
- MISChttps://cert.360.cn/warning/detail?id=7240aeab581c6dc2c9c5350756079955