| Bug ID | 1184428 |
|---|---|
| Summary | VUL-0: CVE-2021-21404: syncthing: relay server `strelaysrv` can be caused to crash and exit by sending a relay message with a negative length field |
| Classification | openSUSE |
| Product | openSUSE Distribution |
| Version | Leap 15.2 |
| Hardware | Other |
| URL | https://smash.suse.de/issue/281245/ |
| OS | Other |
| Status | NEW |
| Severity | Minor |
| Priority | P5 - None |
| Component | Basesystem |
| Assignee | screening-team-bugs@suse.de |
| Reporter | abergmann@suse.com |
| QA Contact | security-team@suse.de |
| Found By | Security Response Team |
| Blocker | --- |
CVE-2021-21404 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. References: http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2021-21404 http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-21404 https://github.com/syncthing/syncthing/commit/fb4fdaf4c0a79c22cad000c42ac1394e3ccb6a97 https://github.com/syncthing/syncthing/releases/tag/v1.15.0 https://github.com/syncthing/syncthing/security/advisories/GHSA-x462-89pf-6r5h https://pkg.go.dev/github.com/syncthing/syncthing