Reported

February 17, 2021

Issued

September 18, 2021 (last modified: June 13, 2023)

Package

tectonic_xdv (crates.io)

Type

INFO Unsound

Categories

• memory-exposure

Aliases

• CVE-2021-45703
• GHSA-6692-8qqf-79jc
• GHSA-qwvx-c8j7-5g75

References

• https://github.com/tectonic-typesetting/tectonic/issues/752

Patched

• >=0.1.12

Description

Affected versions of this crate passes an uninitialized buffer to a user-provided Read implementation.

Arbitrary Read implementations can read from the uninitialized buffer (memory exposure) and also can return incorrect number of bytes written to the buffer. Reading from uninitialized memory produces undefined values that can quickly invoke undefined behavior.

The problem was fixed in commit cdff034 by zero-initializing the buffer before passing it to a user-provided Read implementation.

Advisory available under CC0-1.0 license.