CWE-208

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          "type": "finder",
          "value": "Zhang Delong"
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          "type": "remediation developer",
          "value": "Jakub Witczak"
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          "type": "remediation reviewer",
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              "value": "\u003cp\u003eObservable Timing Discrepancy vulnerability in Erlang/OTP ssh (ssh_auth, ssh_options modules) allows unauthenticated remote username enumeration via timing side-channel in password authentication.\u003c/p\u003e\n\u003cp\u003eWhen the SSH daemon is configured with the \u003ccode\u003euser_passwords\u003c/code\u003e or \u003ccode\u003epassword\u003c/code\u003e option, \u003ccode\u003essh_auth:check_password/3\u003c/code\u003e performs a PBKDF2-SHA256 computation with 600,000 iterations (~300ms) for valid usernames, but returns immediately (~0ms) for invalid usernames via the \u003ccode\u003essh_options:get_password_option/2\u003c/code\u003e path. This timing difference is detectable in a single authentication attempt and allows an unauthenticated attacker to distinguish valid from invalid usernames.\u003c/p\u003e\n\u003cp\u003eThe \u003ccode\u003euser_passwords\u003c/code\u003e and \u003ccode\u003epassword\u003c/code\u003e options are documented as intended for test purposes; the recommended alternative is \u003ccode\u003epwdfun\u003c/code\u003e, which is not affected by this vulnerability.\u003c/p\u003e\n\u003cp\u003eThis vulnerability is associated with program files \u003ccode\u003elib/ssh/src/ssh_auth.erl\u003c/code\u003e and \u003ccode\u003elib/ssh/src/ssh_options.erl\u003c/code\u003e.\u003c/p\u003e\n\u003cp\u003eThis issue affects OTP from OTP\u0026nbsp;29.0 before OTP\u0026nbsp;29.0.2, corresponding to ssh from 6.0 before 6.0.1.\u003c/p\u003e"
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              "value": "Observable Timing Discrepancy vulnerability in Erlang/OTP ssh (ssh_auth, ssh_options modules) allows unauthenticated remote username enumeration via timing side-channel in password authentication.\n\nWhen the SSH daemon is configured with the `user_passwords` or `password` option, `ssh_auth:check_password/3` performs a PBKDF2-SHA256 computation with 600,000 iterations (~300ms) for valid usernames, but returns immediately (~0ms) for invalid usernames via the `ssh_options:get_password_option/2` path. This timing difference is detectable in a single authentication attempt and allows an unauthenticated attacker to distinguish valid from invalid usernames.\n\nThe `user_passwords` and `password` options are documented as intended for test purposes; the recommended alternative is `pwdfun`, which is not affected by this vulnerability.\n\nThis vulnerability is associated with program files `lib/ssh/src/ssh_auth.erl` and `lib/ssh/src/ssh_options.erl`.\n\nThis issue affects OTP from OTP\u00a029.0 before OTP\u00a029.0.2, corresponding to ssh from 6.0 before 6.0.1."
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