Oracle WebLogic Server XMLDecoder Class Deserialization Vulnerability [CVE-2019-2729]

CVE Number – CVE-2019-2729

A vulnerability in the Web Services component of Oracle WebLogic Server could allow an unauthenticated, remote attacker to execute arbitrary code on a targeted system.

The vulnerability is due to a deserialization condition that exists when the affected software uses the XMLDecoder class. An attacker could exploit this vulnerability by sending a request that submits malicious input to the targeted system. A successful exploit could allow the attacker to execute arbitrary code, which could be used to conduct further attacks. 

Oracle has confirmed the vulnerability and released software updates.

Analysis

  • To exploit this vulnerability, an attacker must send a request that submits malicious input to the targeted system, making exploitation more difficult in environments that restrict network access from untrusted sources.

    Reports indicate that this vulnerability is actively being exploited in the wild.

Safeguards

  • Administrators are advised to apply the appropriate updates.

    Administrators are advised to allow only trusted users to have network access.

    Administrators are advised to run both firewall and antivirus applications to minimize the potential of inbound and outbound threats.

    Administrators may consider using IP-based access control lists (ACLs) to allow only trusted systems to access the affected systems.

    Administrators can help protect affected systems from external attacks by using a solid firewall strategy.

    Administrators are advised to monitor affected systems.

Vendor Announcements

  • Oracle has released an out-of-band security advisory at the following link: CVE-2019-2729

Fixed Software

Duncan Newell

Duncan is a technology professional with over 20 years experience of working in various IT roles. He has a interest in cyber security, and has a wide range of other skills in radio, electronics and telecommunications.

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