CVE-2024-12086
MediumCVSS 6.1Exploitation Probability (EPSS)
High risk75th percentile - higher than 75% of all known CVEs
Summary
A flaw was found in rsync that could allow a server to enumerate the contents of an arbitrary file from the client's machine. The issue occurs during file copy from client to server when the server sends checksums of local data for comparison. An attacker can send specially crafted checksum values and reconstruct the data byte-by-byte based on client responses.
Risk Assessment
The risk involves leakage of sensitive data from the client machine, such as passwords, private keys, or documents, without the user's knowledge. An attacker controlling the rsync server can perform a directory traversal attack and read arbitrary files.
Recommendation
Immediately update rsync to a version that fixes this vulnerability. Until the update is applied, limit trust in rsync servers and use additional authentication and encryption mechanisms (e.g., SSH).
Original NVD description (English source)
A flaw was found in rsync. It could allow a server to enumerate the contents of an arbitrary file from the client's machine. This issue occurs when files are being copied from a client to a server. During this process, the rsync server will send checksums of local data to the client to compare with in order to determine what data needs to be sent to the server. By sending specially constructed checksum values for arbitrary files, an attacker may be able to reconstruct the data of those files byte-by-byte based on the responses from the client.