Tillitis TKey Client package is a Go package for a TKey client. Versions 1.2.0 and below contain a critical bug in the tkeyclient Go module which causes 1 out of every 256 User Supplied Secrets (USS) to be silently ignored, producing the same Compound Device Identifier (CDI)—and thus the same key material—as if no USS is provided. This happens because a buffer index error overwrites the USS-enabled boolean with the first byte of the USS digest, so any USS whose hash starts with 0x00 is effectively discarded.
This issue has been fixed in version 1.3.0. Users unable to upgrade immediately should switch to a USS whose hash does not begin with a zero byte.
Attack Parameters
Attack Vector
Physical
Requires physical access
Attack Complexity
Low
Easy to exploit
Attack Requirements
None
No additional conditions
Privileges Required
None
No privileges needed
User Interaction
None
No user interaction needed
Impact Assessment
Confidentiality
Low
Partial data leak
Integrity
Low
Partial data modification
Availability
Low
Partial disruption
CVSS Vector v4.0
Weakness Type (CWE)
Vulnerable Products 1
| Configuration | From (including) | Up to (excluding) |
|---|---|---|
|
Tillitis Tkey_Client
cpe:2.3:a:tillitis:tkey_client:*:*:*:*:*:go:*:*
|
— |
1.3.0
|
References 3
https://github.com/tillitis/tkeyclient/commit/4954dccf0287657edf8d405057e134cdf…
security-advisories@github.com
https://github.com/tillitis/tkeyclient/releases/tag/v1.3.0
security-advisories@github.com
https://github.com/tillitis/tkeyclient/security/advisories/GHSA-4w7r-3222-8h6v
security-advisories@github.com