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Advisories

Coder before 2.35.4 Credential Theft via Workspace Proxy Hostname Prefix Match

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Severity
high
Date
Affecting

  • coder >= 2.35.0, < 2.35.4

  • coder >= 2.34.0, < 2.34.8

  • coder >= 2.33.0, < 2.33.12

  • coder >= 0, < 2.29.20

CWE
  • CWE-522 Insufficiently Protected Credentials
CVSS
8.7
CVSS V4 Vector
CVSS:4.0/AV:N/AC:H/AT:P/PR:L/UI:P/VC:H/VI:H/VA:N/SC:H/SI:H/SA:N
Description
Coder before 2.29.20, 2.33.0 before 2.33.12, 2.34.0 before 2.34.8, and 2.35.0 before 2.35.4 contains an improper hostname validation flaw in GetWorkspaceProxyByHostname whose SIMILAR TO pattern performs a prefix match, so any domain that is a string prefix of a workspace-proxy access URL is trusted as a proxy. Attackers owning such a domain can lure an authenticated victim to a crafted /api/v2/applications/auth-redirect link, capture the redirected application_connect API key, and replay it to access the victim's workspace apps.

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