CVE-2018-3191 Deserialization in WebLogic Server

Critical 9.8 Published 17 Oct 2018 Updated 2 Oct 2024

Unauthenticated attackers can achieve remote code execution and full server takeover via the T3 protocol in Oracle WebLogic Server.

Exploited in the wild: Not known
Login needed: Not needed
Attackable: Over the internet
Victim action needed: Not needed
Fix: None listed

What is CVE-2018-3191?

CVE-2018-3191 is a critical unsafe deserialization vulnerability in Oracle Weblogic Server, published on 17 Oct 2018. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

Vulnerability in the Oracle WebLogic Server component of Oracle Fusion Middleware (subcomponent: WLS Core Components). Supported versions that are affected are 10.3.6.0, 12.1.3.0 and 12.2.1.3. Easily exploitable vulnerability allows unauthenticated attacker with network access via T3 to compromise Oracle WebLogic Server. Successful attacks of this vulnerability can result in takeover of Oracle WebLogic Server. CVSS 3.0 Base Score 9.8 (Confidentiality, Integrity and Availability impacts). CVSS Vector: (CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H).

Which versions are affected by CVE-2018-3191?

It affects 1 product.

Products include Oracle Weblogic Server.

How do I fix CVE-2018-3191?

No fix has been published for CVE-2018-3191 yet. Limit exposure of the affected software until one is available.

Upgrade, and only deserialise data from trusted sources or with an allow-list of types. More about Unsafe deserialization.

Is CVE-2018-3191 being exploited?

There is no known exploitation of CVE-2018-3191 in the wild and no public exploit code.

Public exploit code: 5 proofs of concept on GitHub.

All Oracle Weblogic Server vulnerabilities

Sources

Also known as GHSA-mw7v-jjc3-g2r9.