Unix-like operating systems may segfault due to dereferencing a dangling pointer in specific circumstances. This requires an environment variable to be set in a different thread than the affected functions. This may occur without the user's knowledge, notably in a third-party library.
The Rust Security Response Working Group was recently notified of a security
issue affecting the search feature of mdBook, which could allow an attacker to
The search feature of mdBook (introduced in version 0.1.4) was affected by a
cross site scripting vulnerability that allowed an attacker to execute
a malicious search query, or tricking the user into clicking a link to the
search page with the malicious search query prefilled.
mdBook 0.4.5 fixes the vulnerability by properly escaping the search query.
Owners of websites built with mdBook have to upgrade to mdBook 0.4.5 or greater
and rebuild their website contents with it. It's possible to install mdBook
0.4.5 on the local system with:
cargo install mdbook --version 0.4.5 --force
Thanks to Kamil Vavra for responsibly disclosing the vulnerability to us
according to our security policy.
Timeline of events
All times are listed in UTC.
2020-12-30 20:14 - The issue is reported to the Rust Security Response WG
2020-12-30 20:32 - The issue is acknowledged and the investigation began
2020-12-30 21:21 - Found the cause of the vulnerability and prepared the patch
2021-01-04 15:00 - Patched version released and vulnerability disclosed