🇰🇷 한글 설명
Lookyloo의 PlaywrightCapture에서 only_global_lookup 옵션이 활성화된 경우에도 SSRF 취약점이 발생합니다. 파비콘(favicon)을 가져오는 과정이 브라우저의 요청 라우팅 보호 기능과 별개로 실행되어, 공격자가 조작된 파비콘 URL을 통해 내부 네트워크 자원에 접근할 수 있습니다.
💡 쉬운 설명
웹사이트를 캡처할 때 아이콘(파비콘)을 불러오는 과정에서 보안 검사를 건너뛰는 허점이 발견되었습니다. 이를 통해 공격자는 외부에서 접근할 수 없는 회사의 내부 서버나 네트워크에 몰래 접속을 시도할 수 있습니다.
🇺🇸 원문 (English)
A Server-Side Request Forgery (SSRF) vulnerability existed in Lookyloo's PlaywrightCapture when the only_global_lookup option was enabled.
PlaywrightCapture implements this option to prevent captures from accessing local, loopback, or otherwise non-public network resources. However, favicon retrieval was performed separately from the browser request-routing protections. Favicon URLs extracted from rendered HTML were resolved and subsequently fetched directly using an aiohttp.ClientSession.
An attacker able to supply or control a web page processed by PlaywrightCapture could include a crafted favicon reference, for example pointing to a loopback address, private IP address, or another resource reachable only from the PlaywrightCapture host. When the page was processed, the favicon retrieval routine could issue an HTTP request to this destination despite only_global_lookup being enabled.
This bypass could therefore be used to make the PlaywrightCapture host interact with internal network services that should not be reachable through a capture. Depending on the targeted service and its response, this could enable internal service discovery, access to internal resources, or interaction with HTTP endpoints available only from the capture infrastructure.
The patch introduces a common URL validation routine and applies it to favicon retrieval. Direct non-global IP addresses, localhost, .local domains, malformed URLs, and other explicitly non-public destinations are rejected before the favicon request is performed.
This fix is a complementary fix to CVE-2026-44439 - GCVE-0-2026-44439 - GHSA-687H-XW6F-Q2QW
📍 영향받는 시스템
Lookyloo PlaywrightCapture (only_global_lookup 옵션 활성화 시)
⚔️ 공격 벡터
조작된 파비콘 URL을 포함한 웹 페이지를 PlaywrightCapture로 처리하도록 유도하여 내부 IP 또는 루프백 주소로 HTTP 요청을 발생시킴
🛡️ 대응 방법
파비콘 요청 전 URL 유효성을 검사하여 로컬 IP, localhost, .local 도메인 등을 차단하는 패치를 적용해야 함
🔧 검증 코드
설치된 Lookyloo의 버전을 확인하여 보안 패치가 적용된 최신 버전인지 확인합니다.
pip show lookyloo 2>/dev/null | grep -E 'Version'