Impact

Authenticated attackers posing as functionaries (i.e., within a trusted set of users for a layout) are able to create attestations that may bypass DISALLOW rules in the same layout. An attacker with access to trusted private keys, may issue an attestation that contains a disallowed artifact by including path traversal semantics (e.g., foo vs dir/../foo).

Patches

The problem has been fixed in version 0.3.0.

Workarounds

Exploiting this vulnerability is dependent on the specific policy applied.

For more information

If you have any questions or comments about this advisory:

• Open an issue in in-toto-golang
• Email us at in-toto-public
• If this is a sensitive security-relevant disclosure, please send a PGP encrypted email to santiagotorres@purdue.edu or jcappos@nyu.edu

References

• GHSA-vrxp-mg9f-hwf3
• https://nvd.nist.gov/vuln/detail/CVE-2021-41087
• in-toto/in-toto-golang@f2c57d1