Access Restriction Bypass Affecting openjdk-jre package, versions [,1.7.0_341) [1.8.0,1.8.0_331) [9.0.0,11.0.15) [12.0.0,17.0.3) [18.0.0,18.0.1)

openjdk-jre is a free and open-source implementation of the Java Platform, Standard Edition (Java SE).

Affected versions of this package are vulnerable to Access Restriction Bypass by an unauthenticated attacker with network access via multiple protocols. This is due to incorrect implementation of the ECDSA cryptographic signature in Java. Exploiting this vulnerability results in unauthorized creation, deletion, or modification access to critical data or all Oracle Java SE, Oracle GraalVM Enterprise Edition accessible data.

Notes:

1. This vulnerability applies to Java deployments, typically in clients running sandboxed Java Web Start applications or sandboxed Java applets, that load and run untrusted code (e.g., code that comes from the internet) and rely on the Java sandbox for security.

2. This vulnerability can also be exploited by using APIs in the specified Component, e.g., through a web service that supplies data to the APIs.

• Graalvm Release Notes
• JDK Release notes
• Neil Madden Blog - Psychic Signatures in Java
• Oracle Security Advisory
• PoC by Khaled Nassar