Syncthing is a continuous file synchronization program. In Syncthing before version 1.15.0, the relay server `strelaysrv` can be caused to crash and exit by sending a relay message with a negative length field. Similarly, Syncthing itself can crash for the same reason if given a malformed message from a malicious relay server when attempting to join the relay. Relay joins are essentially random (from a subset of low latency relays) and Syncthing will by default restart when crashing, at which point it's likely to pick another non-malicious relay. This flaw is fixed in version 1.15.0.
History

No history.

cve-icon MITRE Information

Status: PUBLISHED

Assigner: GitHub_M

Published: 2021-04-06T20:00:15

Updated: 2021-04-06T20:00:15

Reserved: 2020-12-22T00:00:00


Link: CVE-2021-21404

JSON object: View

cve-icon NVD Information

Status : Analyzed

Published: 2021-04-06T20:15:13.490

Modified: 2021-04-14T18:00:32.527


Link: CVE-2021-21404

JSON object: View

cve-icon Redhat Information

No data.

CWE