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Bitwarden: Blind HTTP GET SSRF via website icon fetch (bypass of pull#812)

🗓️ 16 Jul 2020 16:40:56Reported by shielderType 
hackerone
 hackerone🔗 hackerone.com👁 22 Views

Blind HTTP GET SSRF via Bitwarden website icon fetch (bypass of pull#812). SSRF vulnerability on Bitwarden server allows fetching icon images via domain entrypoint. Pull#812 tries to prevent SSRF attacks but can be bypassed. Proof-of-concept involves setting up a webserver, malicious nameserver, and self-hosted Bitwarden instance with a dummy listener for HTTP endpoints. Bonus potential bypass via DNS resolution TOCTOU attack

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11 Sep 2020 13:24Current
0.1Low risk
Vulners AI Score0.1
bitwardenssrfpull#812icon fetchingserver vulnerabilityhttp redirectproof-of-conceptdummy listenerdns resolutiontoctousecurity issue.
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