Zero-day vulnerability in Oracle WebLogic

Security experts are warning of a dangerous zero-day remote code vulnerability that affects the Oracle WebLogic service platform.

Oracle WebLogic wls9_async and wls-wsat components are affected by a deserialization remote command execution zero-day vulnerability.

New Oracle #WebLogic #RCE #Deserialization 0-day Vulnerability. No vendor fix yet! Speak to @waratek for guaranteed active protection against 0-day RCE attacks with no blacklists, signatures, or profiling #NoSourceCodeChanges https://t.co/mvtOGKpKPh pic.twitter.com/K6q7RVnCn6

— Waratek (@waratek) April 24, 2019

This zero-day flaw affects all Weblogic versions, including the latest one, that have the wls9_async_response.war and wls-wsat.war components enabled.

Oracle WebLogic Server is a Java EE application server currently developed by Oracle Corporation, it is used by numerous applications and web enterprise portals based on Java technology. The flaw received the identifier CNVD-C-2019-48814.

An attacker could exploit the vulnerability to remotely execute commands without authorization by sending a specially crafted HTTP request.

According to the bulletin CNTA-2019-0015 issued by CNCERT/CC, the flaw affects the WebLogic 10.x and WebLogic 12.1.3 versions. The criticality flaw has not yet been addressed by Oracle.

Experts recomments to disable vulnerable modules “wls9_async_response.war” and “wls-wsat.war”, or to inhibit access to URLs “/ _async / * “and” / wls-wsat / * “within Oracle WebLogic installs.

Experts at KnownSec 404 Team searched for vulnerable instances online by using the ZoomEye search engine, they found 36,173 installs, most of them in the US and China.

Experts at F5 Labs revealed to have already spotted a campaign exploiting the zero-day flaw in Weblogic servers.

[In Review] Watch out! New campaign spotted targeting #Weblogic servers using a zero-day deserialization vulnerability leading to Remote Code Execution. #0day pic.twitter.com/eNTEOTa90U

— F5 Labs (@F5Labs) April 23, 2019

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Pierluigi Paganini

(SecurityAffairs – Weblogic, zero-day)

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