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Advisories

DeepSeek Harness < 0.1.2-alpha.1 Authentication Bypass via Host Header Spoofing

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severity
critical
date
Affecting

  • DeepSeek Harness < 0.1.2-alpha.1

CWE
  • CWE-807 Reliance on Untrusted Inputs in a Security Decision
CVSS
9.4
CVSS V4 Vector
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H
Credit
Nir Zadok (Nirza), Moshe Siman Tov Bustan
Description
DeepSeek Harness before 0.1.2-alpha.1 contains an authentication bypass vulnerability in its local HTTP control-plane API that allows attackers to gain full agent control by supplying a spoofed Host header, as the server validates only the client-supplied Host header value rather than the actual TCP connection origin. Attackers can exploit this flaw to invoke privileged commands such as commands/execute with danger-full-access permissions, escalate session approval policies to unconfined execution, and retrieve all stored conversations without any credential or API key.

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