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CVE-2018-11776: Apache Struts Remote Code Execution Vulnerability

criticalknown exploitedpublic exploitCVE-2018-11776
Actively exploited. At least one CVE in this advisory is listed in the CISA Known Exploited Vulnerabilities catalog — exploitation has been observed in the wild. Treat remediation as urgent.
Apache Struts contains a vulnerability that allows for remote code execution under two circumstances. One, where the alwaysSelectFullNamespace option is true and the value isn't set for a result defined in underlying configurations and in same time, its upper package configuration have no or wildcard namespace. Or, using URL tag which doesn't have value and action set and in same time, its upper package configuration have no or wildcard namespace.

CSIRTS triage

vendor: Apacheproduct: StrutsRemote code execution
What
The vulnerability allows remote code execution under specific configuration conditions.
Who is affected
Deployments of Apache Struts with certain configurations are affected.
Urgency
Remediation is critical due to active exploitation and severity.
Action
Update Apache Struts to the latest version.

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Details

Source
CISA Known Exploited Vulnerabilities (US · database · site)
Severity
critical
Published
2021-11-03
Exploitation
Observed in the wild (CISA KEV)

Original advisory: https://nvd.nist.gov/vuln/detail/CVE-2018-11776

Exploitation outlook

EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.

Referenced CVEs

CVECSIRTS overviewExternal
CVE-2018-11776coverage & exploitation statusNVD · CVE.org

Recent advisories for Apache Struts Remote

A cluster of recent advisories against the same product widens the attack surface — attackers routinely chain freshly published CVEs on one product, so review these together.

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