Description (CNA)
SiYuan before v3.7.4 contains a server-side request forgery (SSRF) vulnerability in the isPrivateIP function in kernel/util/net.go, used by SSRFSafeDialer to enforce SSRF protection in SafeMode. The function only checks for loopback, link-local unicast, private, and unspecified addresses and does not recognize IPv6 transition addresses (NAT64 64:ff9b::/96, 6to4 2002::/16, Teredo 2001::/32) that embed private IPv4 destinations. When SafeMode is enabled, an authenticated attacker can bypass the SSRF guard via the network forward proxy, WebSocket proxy, or SSE proxy endpoints by supplying a URL whose hostname resolves to such a transition address, reaching internal services and cloud metadata endpoints (e.g., 169.254.169.254). Because the forward proxy returns the full response body, this is a full-read SSRF that can be used to steal instance credentials, reach internal services, and port-scan internal infrastructure.
Affected (CNA)
| Vendor / product | Versions |
|---|---|
| siyuan-note / siyuan | affected 0 before 3.7.4; unaffected 3.7.4 |
CWE
CWE-918
References
- https://github.com/siyuan-note/siyuan/security/advisories/GHSA-qq8m-8p8v-x4xg
- https://www.vulncheck.com/advisories/siyuan-before-ssrf-via-ipv6-transition-address-bypass
ADP enrichment
No English description supplied.