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GHSA-4f8r-qqr9-fq8j
No affected components available
During the ongoing work on the TUF conformance test suite, we have come across a test that reveals what we believe is a bug in go-tuf with security implications. The bug exists in go-tuf delegation tracing and could result in downloading the wrong artifact.
We have come across this issue in the test in this PR: https://github.com/theupdateframework/tuf-conformance/pull/115.
The test - test_graph_traversal - sets up a repository with a series of delegations, invokes the clients refresh() and then checks the order in which the client traced the delegations. The test shows that the go-tuf client inconsistently traces the delegations in a wrong way. For example, during one CI run, the two-level-delegations test case triggered a wrong order. The delegations in this look as such:
"two-level-delegations": DelegationsTestCase(
delegations=[
DelegationTester("targets", "A"),
DelegationTester("targets", "B"),
DelegationTester("B", "C"),
],
visited_order=["A", "B", "C"],
),
Here, targets delegate to "A", and to "B", and "B" delegates to "C". The client should trace the delegations in the order "A" then "B" then "C" but in this particular CI run, go-tuf traced the delegations "B"->"C"->"A".
In a subsequent CI run, this test case did not fail, but another one did.
@jku has done a bit of debugging and believes that the returned map of GetRolesForTarget returns a map that causes this behavior:
https://github.com/theupdateframework/go-tuf/blob/f95222bdd22d2ac4e5b8ed6fe912b645e213c3b5/metadata/metadata.go#L565-L580
We believe that this map should be an ordered list instead of a map.
The vulnerability can be exploited over the network without needing physical access. It is easy for an attacker to exploit this vulnerability. An attacker does not need any special privileges or access rights. 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 integrity of the data.
Exploitation attempts have been detected. Elevated vigilance and prompt remediation are advised.
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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