CVE-2026-43617

脆弱性の種類

Rsync version 3.4.2 and prior contain an authorization bypass vulnerability in the rsync daemon's hostname-based access control list enforcement when configured with chroot. Attackers can bypass hostname-based deny rules by controlling the PTR record for their source IP address, allowing connections from hostnames that administrators intended to deny when reverse DNS resolution fails and defaults to UNKNOWN.

影響を受ける製品

• samba rsync

参考情報

• https://github.com/RsyncProject/rsync/releases/tag/v3.4.3
• https://github.com/RsyncProject/rsync/security/advisories/GHSA-rjfm-3w2m-jf4f
• https://www.vulncheck.com/advisories/rsync-authorization-bypass-via-hostname-resolution