zip: AES Entry HMAC Authentication Bypass on Premature EOF

[ Why it matters ]Priority signals

• Public proof-of-concept exploit exists (CISA SSVC)

[ Description ]Official description

zip is a zip library for Rust that supports reading and writing simple ZIP files. From 0.6.0 until 9.0.0, the AES entry reader in src/aes.rs verifies its HMAC only when the attacker-controlled data counter reaches zero. If the underlying bounded reader reaches the real end of the archive while data_remaining is still positive, or if an encrypted entry has no payload, the reader can return a clean end of stream without reading and comparing the authentication tag. Applications using by_index_decrypt, by_name_decrypt, by_path_decrypt, or password-enabled by_index_with_options can therefore accept modified plaintext without an authentication error. This issue is fixed in version 9.0.0.

[ Fixes ]Fixes and patches

• zip 9.0.0Fixed version · GitHub Advisories · rust package zip: upgrade to 9.0.0 or later (affected >= 0.6.0, < 9.0.0)

[ Packages ]Affected open-source packages

• zip rustAffected >= 0.6.0, < 9.0.0 · fixed in 9.0.0 · GHSA-8hxf-qr8p-62x4

[ References ]References

• github.com/zip-rs/zip2/commit/ec265db0b0602f8ffb9479327397bddefb7e2216
• github.com/zip-rs/zip2/releases/tag/v9.0.0
• github.com/zip-rs/zip2/security/advisories/GHSA-8hxf-qr8p-62x4