#VU79775 Stored cross-site scripting in syncthing - CVE-2022-46165

Vulnerability identifier: #VU79775

Vulnerability risk: Medium

CVSSv4.0: 1.2 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N/E:U/U:Green]

CVE-ID: CVE-2022-46165

CWE-ID: CWE-79

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
syncthing
Server applications / Other server solutions

Vendor: syncthing.net

Description

The disclosed vulnerability allows a remote attacker to perform cross-site scripting (XSS) attacks.

The vulnerability exists due to insufficient sanitization of user-supplied data when handling filenames in webUI. A remote attacker can trick the victim to synchronize a malicious folder and execute arbitrary HTML and script code in user's browser in context of vulnerable website.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

syncthing: 0.1 - 1.23.4

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External links
https://github.com/syncthing/syncthing/security/advisories/GHSA-9rp6-23gf-4c3h
https://github.com/syncthing/syncthing/commit/73c52eafb6566435dffd979c3c49562b6d5a4238
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/XEBWSQVGHSTR4ZO7LVVEMPEGMV2DS5XR/
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/IRYGBFJPVBW6PPTETNIBWQJE4HJSA5PJ/

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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.