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GHSA-76g3-38jv-wxh4
No affected components available
Summary
TUF repositories use the timestamp role to protect against rollback events by enabling an automated process to periodically sign the role's metadata. While tough will ensure that the version of snapshot metadata in new timestamp metadata files was always greater than or equal to the previously trusted version, it will only do so after persisting the timestamp metadata to its cache.
Impact
If the tough client successfully detects a rollback event in which timestamp metadata contains outdated snapshot metadata, the invalid timestamp metadata will still be persisted to cache as trusted. tough may then subsequently incorrectly identify valid timestamp metadata as being rolled back, preventing the client from consuming valid updates.
Impacted versions: < v0.20.0
Patches
A fix for this issue is available in tough version 0.20.0 and later. Customers are advised to upgrade to version 0.20.0 or later and ensure any forked or derivative code is patched to incorporate the new fixes.
Workarounds
There is no recommended work around. Customers are advised to upgrade to version 0.20.0 or the latest version.
References
If you have any questions or comments about this advisory we ask that you contact AWS/Amazon Security via our vulnerability reporting page [1] or directly via email to aws-security@amazon.com. Please do not create a public GitHub issue.
[1] Vulnerability reporting page: https://aws.amazon.com/security/vulnerability-reporting
Acknowledgement
These issues were identified by the TUF-Conformance project. We would like to thank Google for collaborating on this issue through the coordinated vulnerability disclosure process.
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 high-level or administrative privileges. The attacker needs the user to perform some action, like clicking a link. The impact is confined to the system where the vulnerability exists. There is a high impact on the availability of the system.
Limited exploitation activity has been observed. Close monitoring and planned remediation are recommended.
The exploit probability is very low. The vulnerability is unlikely to be exploited in the next 30 days.
We did not find any exploit available. Neither in GitHub repositories nor in the Exploit-Database.
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