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The vulnerability may allow a remote attacker to request data from internal resources that are not publicly available only by manipulating the processed input stream with a Java runtime version 14 to 8. No user is affected, who followed the recommendation to setup XStream's security framework with a whitelist limited to the minimal required types.
If you rely on XStream's default blacklist of the Security Framework, you will have to use at least version 1.4.18.
See workarounds for the different versions covering all CVEs.
See full information about the nature of the vulnerability and the steps to reproduce it in XStream's documentation for CVE-2021-39150.
Lai Han of NSFOCUS security team found and reported the issue to XStream and provided the required information to reproduce it.
If you have any questions or comments about this advisory:
The vulnerability may allow a remote attacker to request data from internal resources that are not publicly available only by manipulating the processed input stream with a Java runtime version 14 to 8. No user is affected, who followed the recommendation to setup XStream's security framework with a whitelist limited to the minimal required types.
If you rely on XStream's default blacklist of the Security Framework, you will have to use at least version 1.4.18.
See workarounds for the different versions covering all CVEs.
See full information about the nature of the vulnerability and the steps to reproduce it in XStream's documentation for CVE-2021-39150.
Lai Han of NSFOCUS security team found and reported the issue to XStream and provided the required information to reproduce it.
If you have any questions or comments about this advisory:
This critical vulnerability poses an immediate and severe threat to system security. Exploitation could lead to complete system compromise, data breach, or denial of service. Immediate action is required.
Probability of exploitation in the next 30 days · more likely than 88.6% of all CVEs.
Apply security patches to version 1.4.18 immediately
Isolate affected systems from untrusted networks until patching is complete
Implement enhanced monitoring for exploitation attempts and unusual behavior