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Improper Access Control

CVE-2024-36257

Medium
5.3/10

Summary

Mattermost versions 9.5.0-rc1 through 9.5.5, and 9.8.0-rc1 through 9.8.0, when using shared channels with multiple remote servers connected, fail to check that the remote server A requesting server B to update the profile picture of a user is the remote that actually has the user as a local one. This allows a malicious remote A to change the profile images of users that belong to another remote server C that is connected to the server A.

  • LOW
  • NETWORK
  • LOW
  • UNCHANGED
  • NONE
  • NONE
  • NONE
  • NONE

CWE-284 - Improper Access Control

Listed 5th in the 'OWASP Top Ten', improper (or broken) access control attacks are a fundamental type of vulnerability. This includes a broad range of design flaws that enable users to act outside of their intended permissions. They can use these privileges to gain access to restricted files and functionality such as accessing restricted information, falsifying records, destroying data, or executing commands.

References

Advisory Timeline

  • Published