GHSA-gq4h-f254-7cw9: 
Rust vulnerability analysis and mitigation

A high severity vulnerability was discovered in the ticketed_lock Rust crate (GHSA-gq4h-f254-7cw9) affecting versions prior to 0.3.0. The vulnerability stems from the unconditional implementation of Send for ReadTicket and WriteTicket types, which was discovered on November 17, 2020, and published to the GitHub Advisory Database on August 25, 2021. The issue affects the core functionality of the ticketed_lock crate, potentially impacting applications using this locking mechanism (GitHub Advisory, RustSec Advisory).

The vulnerability arises from the unsafe implementation of the Send trait for ReadTicket and WriteTicket without proper type bounds. The CVSS score is 8.1 (High), with attack vector being Network, attack complexity High, requiring no privileges or user interaction. The vulnerability is tracked as CWE-362 and allows non-Send types to be sent across thread boundaries, which violates Rust's thread safety guarantees (GitHub Advisory, RustSec Advisory).

The vulnerability can lead to data races when types with internal mutability are cloned and sent to other threads through ReadTicket/WriteTicket. These data races can result in memory corruption or other undefined behavior, potentially compromising the integrity and security of applications using the affected versions of the crate (RustSec Advisory).

The vulnerability was fixed in version 0.3.0 of the ticketed_lock crate. The fix involves adding T: Send bounds to Send implementations of ReadTicket/WriteTicket, as demonstrated in commit a986a93. Users are advised to upgrade to version 0.3.0 or later to mitigate this vulnerability (GitHub Commit, RustSec Advisory).