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Advisories

Rejetto HFS < 3.2.1 Session Forgery via Predictable Signing Key

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severity
critical
date
Affecting

  • Rejetto HFS 3.0.0 < 3.2.1

CWE
  • CWE-338 Use of Cryptographically Weak Pseudo-Random Number Generator (PRNG)
CVSS
9.3
CVSS V4 Vector
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
References
Credit
Zach Hanley (@hacks_zach) of Horizon3.ai, in collaboration with Claude and Anthropic Research
Description
Rejetto HFS 3.0.0 through 3.2.0 derives its session-cookie signing key from the non-cryptographic Math.random() generator and discloses outputs of the same generator to unauthenticated clients during login. A remote attacker can collect a small number of login responses, reconstruct the generator's state, recover the signing key, and forge a valid administrator session cookie, leading to full administrative access and remote code execution via the server_code configuration feature.

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