zcap has incomplete expiration checks in capability chains.

Vulnerability Description

`@digitalbazaar/zcap` provides JavaScript reference implementation for Authorization Capabilities. Prior to version 9.0.1, when invoking a capability with a chain depth of 2, i.e., it is delegated directly from the root capability, the `expires` property is not properly checked against the current date or other `date` param. This can allow invocations outside of the original intended time period. A zcap still cannot be invoked without being able to use the associated private key material. `@digitalbazaar/zcap` v9.0.1 fixes expiration checking. As a workaround, one may revoke a zcap at any time.

References

• https://github.com/digitalbazaar/zcap/security/advisories/GHSA-hp8h-7x69-4wmv
• https://github.com/digitalbazaar/zcap/pull/82
• https://github.com/digitalbazaar/zcap/commit/261eea040109b6e25159c88d8ed49d3c37f8fcfe
• https://github.com/digitalbazaar/zcap/commit/55f8549c80124b85dfb0f3dcf83f2c63f42532e5