Unauthenticated blind SSRF in Circles signature verification bypasses Nextcloud local-address protections
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原文摘录
摘自原文（8770 字符中的一小部分）
Summary - The Circles app exposes public, no-auth endpoints (e.g., POST /index.php/apps/circles/event/). During signature verification, the server fetches the attacker-provided keyId URL before trust is established. Circles configures the HTTP client to allow local/private addresses, bypassing …
原文中的代码
85-94:appinfo/routes.php ['name' => 'Remote#event', 'url' => '/event/', 'verb' => 'POST'], ['name' => 'Remote#incoming', 'url' => '/incoming/', 'verb' => 'POST'],
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时间线
- 报告提交
- 公开披露
阅读 HackerOne 原文 ↗作者 @0x0doteth · 版权归作者与 Nextcloud 所有