GHSA-qc36-q22q-cjw3

SMTP command injection in lettre

Source: GitHub Advisory Database (reviewed) Critical CVE-2021-38189

Packages

Ecosystem	Package	Affected	Fixed in
crates.io	lettre	>= 0.7.0, < 0.9.6	0.9.6

Details

As written in the advisory (Markdown source, shown as plain text).

### Impact Affected versions of lettre allowed SMTP command injection through an attacker's controlled message body. The module for escaping lines starting with a period wouldn't catch a period that was placed after a double CRLF sequence, allowing the attacker to end the current message and write arbitrary SMTP commands after it. ### Fix The flaw is fixed by correctly handling consecutive CRLF sequences. ### References * [RUSTSEC-2021-0069](https://rustsec.org/advisories/RUSTSEC-2021-0069.html)

References

External links from the advisory. They lead to third-party sites.

https://github.com/lettre/lettre/security/advisories/GHSA-qc36-q22q-cjw3 web
https://github.com/lettre/lettre/pull/627/commits/93458d01fed0ec81c0e7b4e98e6f35961356fae2 web
https://github.com/lettre/lettre/commit/8bfc20506cc5e098fe6eb3d1cafe3bea791215ce web
https://github.com/lettre/lettre package
https://rustsec.org/advisories/RUSTSEC-2021-0069.html web