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Apache Struts 2 - Remote Code Execution (CVE-2018-11776)

Severity
CVSSv3 Score
8.1
Exploitable with Sniper
Yes
Vulnerability description

Apache Struts 2 framework is affected by a Remote Code Execution vulnerability, located in the chain.action endpoint. The root cause of this vulnerability consists in having alwaysSelectFullNamespace flag set in Struts configuration. Therefore, an unauthenticated remote attacker can send HTTP GET requests having OGNL expressions with OS commands included, which will be evaluated by the server.

Exploit capabilities

Sniper can gain unauthenticated Remote Code Execution on the target system and extract multiple artefacts as evidence.

Risk description

The risk exists that a remote unauthenticated attacker can fully compromise the server in order to steal confidential information, install ransomware or pivot to the internal network.

Recommendation

Upgrade the Apache Struts 2 framework to a version equal to or higher than 2.3.35, 2.5.17.

Detectable with
Network Scanner
Vuln date
Aug 2018
Published at
Updated at
Software Type
Web framework
Vendor
Apache
Product
Struts
Codename
Not available