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Advisories

Cyrus SASL through 2.1.28 SRP Authentication Bypass via plugins/srp.c

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Severity
critical
Date
Affecting

  • cyrus-sasl <= 2.1.28

CWE
  • CWE-287 Improper Authentication
CVSS
9.3
CVSS V4 Vector
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N
Credit
afldl
Description
Cyrus SASL through 2.1.28 contains an authentication bypass vulnerability in the SRP server mechanism because srp_server_mech_step2 does not reject client public values A that are multiples of N. Unauthenticated network clients can send A equal to N to force a zero shared secret, authenticating as any existing user without the password and learning session keys.

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