CVE-2018-11776 on CISA KEV

Apache Struts versions 2.3 to 2.3.34 and 2.5 to 2.5.16 suffer from possible Remote Code Execution when alwaysSelectFullNamespace is true (either by user or a plugin like Convention Plugin) and then: results are used with no namespace and in same time, its upper package have no or

01What CISA says about this vulnerability

Apache Struts versions 2.3 to 2.3.34 and 2.5 to 2.5.16 suffer from possible Remote Code Execution when alwaysSelectFullNamespace is true (either by user or a plugin like Convention Plugin) and then: results are used with no namespace and in same time, its upper package have no or wildcard namespace and similar to results, same possibility when using url tag which doesn't have value and action set…

02Required action — verbatim from CISA

Apply updates per vendor instructions.

03Notes & references

• www.securitytracker.com — http://www.securitytracker.com/id/1041888
• www.exploit-db.com — https://www.exploit-db.com/exploits/45367/
• www.exploit-db.com — https://www.exploit-db.com/exploits/45262/
• www.securityfocus.com — http://www.securityfocus.com/bid/105125
• www.securitytracker.com — http://www.securitytracker.com/id/1041547
• www.exploit-db.com — https://www.exploit-db.com/exploits/45260/
• lists.apache.org — https://lists.apache.org/thread.html/r6d03e45b81eab03580cf7f8bb51cb3e9a1b10a2cc0…
• www.oracle.com — http://www.oracle.com/technetwork/security-advisory/cpuoct2018-4428296.html
• www.oracle.com — https://www.oracle.com/security-alerts/cpujul2020.html
• www.oracle.com — https://www.oracle.com/technetwork/security-advisory/cpujan2019-5072801.html
• security.netapp.com — https://security.netapp.com/advisory/ntap-20181018-0002/
• cwiki.apache.org — https://cwiki.apache.org/confluence/display/WW/S2-057
• psirt.global.sonicwall.com — https://psirt.global.sonicwall.com/vuln-detail/SNWLID-2018-0012
• www.oracle.com — http://www.oracle.com/technetwork/security-advisory/alert-cve-2018-11776-5072787…
• lgtm.com — https://lgtm.com/blog/apache_struts_CVE-2018-11776
• security.netapp.com — https://security.netapp.com/advisory/ntap-20180822-0001/
• www.arubanetworks.com — http://www.arubanetworks.com/assets/alert/ARUBA-PSA-2018-005.txt
• github.com — https://github.com/hook-s3c/CVE-2018-11776-Python-PoC
• packetstormsecurity.com — http://packetstormsecurity.com/files/172830/Apache-Struts-Remote-Code-Execution.…

04SARA's analyst layer — why this matters

This vulnerability is currently on the CISA KEV list, which CISA only adds CVEs to when there is reliable evidence of active exploitation in the wild. For federal civilian agencies, BOD 22-01 requires remediation by the due date above. For everyone else, KEV is the strongest "patch immediately" signal you can get from public threat intel.

05Affected products (summary)

Vendor	Product	Versions
Apache Software Foundation	Apache Struts	2.3 to 2.3.34, 2.5 to 2.5.16

06Detection

Open the Sigma generator with a pre-filled prompt for this CVE to draft a starting detection:

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