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Syncthing vulnerable to symlink traversal and arbitrary file overwrite

High severity GitHub Reviewed Published May 14, 2022 to the GitHub Advisory Database • Updated Oct 10, 2023

Package

gomod github.com/syncthing/syncthing (Go)

Affected versions

<= 0.14.33

Patched versions

None

Description

Syncthing version 0.14.33 and older erronously versions symlinks when they are deleted. If a directory is then created with the same name, a file created in that directory, and the file deleted, it is moved into the symlink target. This can lead to symlink traversal resulting in arbitrary file overwrite.

References

Published by the National Vulnerability Database Jan 2, 2018
Published to the GitHub Advisory Database May 14, 2022
Reviewed Jul 26, 2023
Last updated Oct 10, 2023

Severity

High

CVSS overall score

This score calculates overall vulnerability severity from 0 to 10 and is based on the Common Vulnerability Scoring System (CVSS).
/ 10

CVSS v3 base metrics

Attack vector
Network
Attack complexity
Low
Privileges required
None
User interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
High
Availability
None

CVSS v3 base metrics

Attack vector: More severe the more the remote (logically and physically) an attacker can be in order to exploit the vulnerability.
Attack complexity: More severe for the least complex attacks.
Privileges required: More severe if no privileges are required.
User interaction: More severe when no user interaction is required.
Scope: More severe when a scope change occurs, e.g. one vulnerable component impacts resources in components beyond its security scope.
Confidentiality: More severe when loss of data confidentiality is highest, measuring the level of data access available to an unauthorized user.
Integrity: More severe when loss of data integrity is the highest, measuring the consequence of data modification possible by an unauthorized user.
Availability: More severe when the loss of impacted component availability is highest.
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

EPSS score

0.085%
(37th percentile)

Weaknesses

CVE ID

CVE-2017-1000420

GHSA ID

GHSA-28xp-g7f6-7mhf

Source code

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