Yonyou U8 Cloud contains an unauthenticated Java deserialization vulnerability in the nc.impl.pub.filesystem.FileManageServlet component that allows remote unauthenticated attackers to execute arbitrary OS commands by sending a serialized payload via POST request. Attackers can exploit the doAction method, which passes raw HTTP request body data directly to ObjectInputStream.readObject() without filtering, to achieve remote code execution. Exploitation evidence was first observed by the Shadowserver Foundation on 2025-02-13.
Attack Parameters
Attack Vector
Network
Can be exploited remotely
Attack Complexity
Low
Easy to exploit
Attack Requirements
None
No additional conditions
Privileges Required
None
No privileges needed
User Interaction
None
No user interaction needed
Impact Assessment
Confidentiality
High
Complete data leak
Integrity
High
Complete data modification
Availability
High
Complete denial of service
CVSS Vector v4.0
Weakness Type (CWE)
References 6
https://avd.aliyun.com/detail?id=AVD-2023-1686894
disclosure@vulncheck.com
https://blog.csdn.net/qq_41904294/article/details/134277353
disclosure@vulncheck.com
https://cn-sec.com/archives/2182384.html
disclosure@vulncheck.com
https://security.yonyou.com/#/noticeInfo?id=400
disclosure@vulncheck.com
https://www.vulncheck.com/advisories/yonyou-u8-cloud-java-deserialization-rce-v…
disclosure@vulncheck.com
https://www.yonyou.com/Global/
disclosure@vulncheck.com