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GHSA-ch68-7cf4-35vr

MediumCVSS 5.3 / 10
Published Feb 7, 2022·Last modified Nov 8, 2023
Affected Components(0)

No affected components available

Description

Impact

This impacts deployments using SAML SSO in two specific cases:

  1. A malicious or compromised Service Provider (SP) could reuse the SAML response to log into Fleet as a user -- only if the user has an account with the same email in Fleet, and the user signs into the malicious SP via SAML SSO from the same Identity Provider (IdP) configured with Fleet.
  2. A user with an account in Fleet could reuse a SAML response intended for another SP to log into Fleet. This is only a concern if the user is blocked from Fleet in the IdP, but continues to have an account in Fleet. If the user is blocked from the IdP entirely, this cannot be exploited.

Patches

Fleet 4.9.1 resolves this issue.

Workarounds and good practices

  • Reduce the length of sessions on your IdP to reduce the window for malicious re-use.
  • Limit the amount of SAML Service Providers/Applications used by user accounts with access to Fleet.
  • When removing access to Fleet in the IdP, delete the Fleet user from Fleet as well.

For more information

If you have any questions or comments about this advisory:

Risk Scores
Base Score
5.3

The vulnerability can be exploited over the network without needing physical access. It is difficult for an attacker to exploit this vulnerability and may require special conditions. An attacker needs basic access or low-level privileges. No user interaction is needed for the attacker to exploit this vulnerability. The impact is confined to the system where the vulnerability exists. There is a high impact on the confidentiality of the information.

Threat Intelligence
4.9

Exploitation attempts have been detected. Elevated vigilance and prompt remediation are advised.

EPSS
0.90%

The exploit probability is very low. The vulnerability is unlikely to be exploited in the next 30 days.

Exploit
Not available

We did not find any exploit available. Neither in GitHub repositories nor in the Exploit-Database.

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