CVE Vulnerabilities


Deserialization of Untrusted Data

Published: Oct 29, 2019 | Modified: Nov 06, 2019
CVSS 3.x
CVSS 2.x

OpenAFS before 1.6.24 and 1.8.x before 1.8.5 is prone to denial of service from unserialized data access because remote attackers can make a series of VOTE_Debug RPC calls to crash a database server within the SVOTE_Debug RPC handler.


The product deserializes untrusted data without sufficiently verifying that the resulting data will be valid.

Affected Software

Name Vendor Start Version End Version
Openafs Openafs * 1.6.24 (excluding)
Openafs Openafs 1.8.0 (including) 1.8.5 (excluding)
Openafs Ubuntu bionic *
Openafs Ubuntu disco *
Openafs Ubuntu eoan *
Openafs Ubuntu esm-apps/bionic *
Openafs Ubuntu esm-apps/focal *
Openafs Ubuntu esm-apps/jammy *
Openafs Ubuntu esm-apps/xenial *
Openafs Ubuntu focal *
Openafs Ubuntu groovy *
Openafs Ubuntu hirsute *
Openafs Ubuntu impish *
Openafs Ubuntu jammy *
Openafs Ubuntu kinetic *
Openafs Ubuntu trusty *
Openafs Ubuntu upstream *
Openafs Ubuntu xenial *

Extended Description

It is often convenient to serialize objects for communication or to save them for later use. However, deserialized data or code can often be modified without using the provided accessor functions if it does not use cryptography to protect itself. Furthermore, any cryptography would still be client-side security – which is a dangerous security assumption. Data that is untrusted can not be trusted to be well-formed. When developers place no restrictions on “gadget chains,” or series of instances and method invocations that can self-execute during the deserialization process (i.e., before the object is returned to the caller), it is sometimes possible for attackers to leverage them to perform unauthorized actions, like generating a shell.

Potential Mitigations

  • Make fields transient to protect them from deserialization.
  • An attempt to serialize and then deserialize a class containing transient fields will result in NULLs where the transient data should be. This is an excellent way to prevent time, environment-based, or sensitive variables from being carried over and used improperly.