EUVD-2026-31013
GHSA-4j4q-473w-9q2r
CVSS VectorNVD
CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
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4DescriptionNVD
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.
AnalysisAI
Hostname-based ACL bypass in the rsync daemon (rsync ≤ 3.4.2) allows unauthenticated remote attackers to circumvent administrator-configured deny rules when the daemon runs with chroot enabled. By manipulating the PTR record for their source IP or engineering a reverse DNS resolution failure, an attacker causes the daemon to fall back to the default hostname 'UNKNOWN', which does not match any configured deny entry and therefore permits the connection. …
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