CVE-2023-26436: open-xchange open-xchange_appsuite_backend Code Injection

Vulnerability summary

CVE-2023-26436 is a high (CVSS 8.8) Code Injection vulnerability in open-xchange open-xchange_appsuite_backend. EPSS estimates a 1.25% chance of exploitation in the next 30 days, higher than 69% of scored vulnerabilities.

Timeline

1. 20-06-2023
   PublishedVulnerability first disclosed.
2. 02-08-2024
   Last modifiedVulnerability information updated.

Description

Attackers with access to the "documentconverterws" API were able to inject serialized Java objects, that were not properly checked during deserialization. Access to this API endpoint is restricted to local networks by default. Arbitrary code could be injected that is being executed when processing the request. A check has been introduced to restrict processing of legal and expected classes for this API. We now log a warning in case there are attempts to inject illegal classes. No publicly available exploits are known.

• CWE-94Improper Control of Generation of Code ('Code Injection')The product constructs all or part of a code segment using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the syntax or behavior of the intended code segment.
• CWE-502Deserialization of Untrusted DataThe product deserializes untrusted data without sufficiently ensuring that the resulting data will be valid.