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              "value": "Loop with Unreachable Exit Condition (\u0027Infinite Loop\u0027) vulnerability in Erlang OTP \u003ctt\u003essh\u003c/tt\u003e (\u003ctt\u003essh_sftpd\u003c/tt\u003e module) allows an authenticated SFTP user to render an SFTP channel permanently unresponsive.\u003cp\u003eThe \u003ctt\u003ehandle_data/4\u003c/tt\u003e function in \u003ctt\u003essh_sftpd\u003c/tt\u003e contains a catch-all clause that accepts channel data of any type. When channel data with a non-zero type code (\u003ctt\u003eSSH_MSG_CHANNEL_EXTENDED_DATA\u003c/tt\u003e) arrives with an empty pending buffer and a payload at or below the SFTP packet size limit, the clause tail-calls itself with identical arguments, creating an infinite loop.\u003c/p\u003e\u003cp\u003eThe SFTP protocol operates exclusively on normal channel data (type 0). Extended data (non-zero type) is meaningless for SFTP and is never sent by conforming clients. However, the SSH protocol permits any channel participant to send extended data on an open channel, so an authenticated SFTP client can trigger the loop by sending \u003ctt\u003eSSH_MSG_CHANNEL_EXTENDED_DATA\u003c/tt\u003e with any \u003ctt\u003edata_type_code\u003c/tt\u003e and any non-empty payload at or below the size limit.\u003c/p\u003e\u003cp\u003eThe targeted \u003ctt\u003essh_sftpd\u003c/tt\u003e process enters an infinite tail-recursive loop. It never processes another message, its message queue grows without bound, and it can only be stopped by killing the process. BEAM\u0027s reduction-based scheduler preemption continues to function, so other processes on the node are not starved, but each stuck channel process consumes its full CPU time share continuously and accumulates unbounded message queue memory. Opening many channels amplifies the CPU and memory impact.\u003c/p\u003e\u003cp\u003eErlang/OTP SSH configurations using the default \u003ctt\u003emax_channels\u003c/tt\u003e setting (\u003ctt\u003einfinity\u003c/tt\u003e) allow an authenticated user to open unlimited channels per connection, amplifying the attack without requiring multiple TCP connections or authentications.\u003c/p\u003e\u003cp\u003eNo file contents, credentials, or write access are obtainable through this issue. The impact is limited to denial of service on targeted SFTP channels, with secondary CPU degradation and memory growth.\u003c/p\u003e\u003cp\u003eThis vulnerability is associated with program file \u003ctt\u003elib/ssh/src/ssh_sftpd.erl\u003c/tt\u003e and program routine \u003ctt\u003essh_sftpd:handle_data/4\u003c/tt\u003e.\u003c/p\u003e\u003cp\u003eThis issue affects OTP from OTP 17.0 before OTP\u0026nbsp;29.0.3, OTP\u0026nbsp;28.5.0.3 and OTP\u0026nbsp;27.3.4.14, corresponding to \u003ctt\u003essh\u003c/tt\u003e from 3.0.1 before 6.0.2, 5.5.2.2 and 5.2.11.9.\u003c/p\u003e"
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              "value": "Improper Enforcement of Message Integrity During Transmission in a Communication Channel vulnerability in Erlang/OTP ssl (tls_gen_connection module) allows a network-positioned attacker to inject unauthenticated plaintext that the TLS client application later treats as authenticated server data.\n\nThe function `tls_gen_connection:handle_protocol_record/3` rejects `APPLICATION_DATA` records that arrive in pre-handshake states when the TLS endpoint acts as a server, but does not apply the same check when the endpoint acts as a client. A network-positioned attacker can send plaintext `APPLICATION_DATA` records to the client during the handshake. The records are buffered and, once the handshake completes successfully, delivered to the application as if they were authenticated post-handshake data. The attacker cannot observe the client\u0027s response or steer the connection, so the impact is limited to blind injection of unauthenticated bytes. The injection window is wider for TLS versions prior to TLS 1.3 than for TLS 1.3.\n\nThis vulnerability is associated with program file `lib/ssl/src/tls_gen_connection.erl`.\n\nTLS 1.3 is affected starting with OTP\u0026nbsp;22.0, when TLS 1.3 support was added.\n\nThis issue affects OTP from OTP\u00a017.0 before OTP\u00a027.3.4.14, from OTP\u00a028.0 before OTP\u00a028.5.0.3, and from OTP\u00a029.0 before OTP\u00a029.0.3, corresponding to ssl from 5.3.4 before 11.2.12.10, from 11.3 before 11.6.0.3, and from 11.7 before 11.7.3. Whether OTP before OTP\u00a017.0, corresponding to ssl before 5.3.4, is affected is unknown."
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