QID 982429

QID 982429: Go (go) Security Update for github.com/syncthing/syncthing (GHSA-x462-89pf-6r5h)

Security update has been released for github.com/syncthing/syncthing to fix the vulnerability.

Note: The preceding description block is extracted directly from the security advisory. Using automation, we have attempted to clean and format it as much as possible without introducing additional issues.

1. `syncthing` can be caused to crash and exit if sent a malformed relay
protocol message message with a negative length field.

2. The relay server `strelaysrv` can be caused to crash and exit if sent
a malformed relay protocol message with a negative length field.

At no point is sensitive data exposed or liable to be altered due to this
issue. Sensitive data is never exposed to relay operators. Syncthing itself
would need to be lured to connect to a malicious relay server in order to
exploit the issue.

CVSS V3 rated as High - 7.5 severity.

CVSS V2 rated as Medium - 5 severity.

Solution

Fixed in version 1.15.0.Workaround:
1. No known workaround for `strelaysrv`.

2. `syncthing` can be configured to not use relays, or to only use specific,
trusted relays. If Syncthing is used in a closed environment or with
relaying disabled, i.e., it does not communicate with unknown relays,
Syncthing is not vulnerable.

Vendor References

GHSA-x462-89pf-6r5h - github.com/advisories/GHSA-x462-89pf-6r5h

CVEs related to QID 982429

CVE-2021-21404 |

Software Advisories

Advisory ID	Software	Component	Link
GHSA-x462-89pf-6r5h	github.com/syncthing/syncthing		github.com/advisories/GHSA-x462-89pf-6r5h

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