CVE-2021-31805

Summary

The fix issued for CVE-2020-17530 was incomplete. So from Apache Struts 2.0.0 to 2.5.29, still some of the tag’s attributes could perform a double evaluation if a developer applied forced OGNL evaluation by using the %{…} syntax. Using forced OGNL evaluation on untrusted user input can lead to a Remote Code Execution and security degradation.

Affected Software

Weaknesses

• CWE-917: CWE-917 Improper Neutralization of Special Elements used in an Expression Language Statement ('Expression Language Injection')

Workarounds

Avoid using forced OGNL evaluation on untrusted user input, and/or upgrade to Struts 2.5.30 which checks if expression evaluation won’t lead to the double evaluation.

Please read our Security Bulletin S2-062 for more details.

ADP Enrichment

CVE Program Container

Additional References

• https://cwiki.apache.org/confluence/display/WW/S2-062
• http://www.openwall.com/lists/oss-security/2022/04/12/6
• https://www.oracle.com/security-alerts/cpujul2022.html
• https://security.netapp.com/advisory/ntap-20220420-0001/

References

• https://cwiki.apache.org/confluence/display/WW/S2-062
• http://www.openwall.com/lists/oss-security/2022/04/12/6
• https://www.oracle.com/security-alerts/cpujul2022.html
• https://security.netapp.com/advisory/ntap-20220420-0001/

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