CVE-2024-12084: rsync security updates

A heap-based buffer overflow flaw was found in the rsync daemon. This issue is due to improper handling of attacker-controlled checksum lengths (s2length) in the code. When MAXDIGESTLEN exceeds the fixed SUMLENGTH (16 bytes), an attacker can write out of bounds in the sum2 buffer.

— NVD

A path traversal vulnerability exists in rsync. It stems from behavior enabled by the --inc-recursive option, a default-enabled option for many client options and can be enabled by the server even if not explicitly enabled by the client. When using the --inc-recursive option, a lack of proper symlink verification coupled with deduplication checks occurring on a per-file-list basis could allow a server to write files outside of the client's intended destination directory. A malicious server could write malicious files to arbitrary locations named after valid directories/paths on the client.

— OSV

rsync has been updated to version 3.4.1 which contains fixes for security vulnerabilities including CVE-2024-12084 and CVE-2024-12088.

— GitLab

Rsync: heap buffer overflow in rsync due to improper checksum length handling

— Microsoft

The vulnerability arises because the checksum length (s2length) is derived from an unvalidated protocol input (MAXDIGESTLEN), which can exceed the size of the pre-allocated buffer (SUMLENGTH), allowing attackers to exploit this behavior.

— Red Hat