CVE-2023-52527
Vulnerability from cvelistv5
Published
2024-03-02 21:52
Modified
2024-12-19 08:21
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: ipv4, ipv6: Fix handling of transhdrlen in __ip{,6}_append_data() Including the transhdrlen in length is a problem when the packet is partially filled (e.g. something like send(MSG_MORE) happened previously) when appending to an IPv4 or IPv6 packet as we don't want to repeat the transport header or account for it twice. This can happen under some circumstances, such as splicing into an L2TP socket. The symptom observed is a warning in __ip6_append_data(): WARNING: CPU: 1 PID: 5042 at net/ipv6/ip6_output.c:1800 __ip6_append_data.isra.0+0x1be8/0x47f0 net/ipv6/ip6_output.c:1800 that occurs when MSG_SPLICE_PAGES is used to append more data to an already partially occupied skbuff. The warning occurs when 'copy' is larger than the amount of data in the message iterator. This is because the requested length includes the transport header length when it shouldn't. This can be triggered by, for example: sfd = socket(AF_INET6, SOCK_DGRAM, IPPROTO_L2TP); bind(sfd, ...); // ::1 connect(sfd, ...); // ::1 port 7 send(sfd, buffer, 4100, MSG_MORE); sendfile(sfd, dfd, NULL, 1024); Fix this by only adding transhdrlen into the length if the write queue is empty in l2tp_ip6_sendmsg(), analogously to how UDP does things. l2tp_ip_sendmsg() looks like it won't suffer from this problem as it builds the UDP packet itself.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/1fc793d68d50dee4782ef2e808913d5dd880bcc6
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/559d697c5d072593d22b3e0bd8b8081108aeaf59
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/7626b9fed53092aa2147978070e610ecb61af844
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/96b2e1090397217839fcd6c9b6d8f5d439e705ed
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/9d4c75800f61e5d75c1659ba201b6c0c7ead3070
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/cd1189956393bf850b2e275e37411855d3bd86bb
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/f6a7182179c0ed788e3755ee2ed18c888ddcc33f
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/fe80658c08e3001c80c5533cd41abfbb0e0e28fd
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/1fc793d68d50dee4782ef2e808913d5dd880bcc6
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/559d697c5d072593d22b3e0bd8b8081108aeaf59
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/7626b9fed53092aa2147978070e610ecb61af844
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/96b2e1090397217839fcd6c9b6d8f5d439e705ed
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/9d4c75800f61e5d75c1659ba201b6c0c7ead3070
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/cd1189956393bf850b2e275e37411855d3bd86bb
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/f6a7182179c0ed788e3755ee2ed18c888ddcc33f
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/fe80658c08e3001c80c5533cd41abfbb0e0e28fd
Impacted products
Vendor Product Version
Linux Linux Version: 3.5
Show details on NVD website

To clipboard 

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This can happen under some\\ncircumstances, such as splicing into an L2TP socket.\\n\\nThe symptom observed is a warning in __ip6_append_data():\\n\\n    WARNING: CPU: 1 PID: 5042 at net/ipv6/ip6_output.c:1800 __ip6_append_data.isra.0+0x1be8/0x47f0 net/ipv6/ip6_output.c:1800\\n\\nthat occurs when MSG_SPLICE_PAGES is used to append more data to an already\\npartially occupied skbuff.  The warning occurs when \u0027copy\u0027 is larger than\\nthe amount of data in the message iterator.  This is because the requested\\nlength includes the transport header length when it shouldn\u0027t.  This can be\\ntriggered by, for example:\\n\\n        sfd = socket(AF_INET6, SOCK_DGRAM, IPPROTO_L2TP);\\n        bind(sfd, ...); // ::1\\n        connect(sfd, ...); // ::1 port 7\\n        send(sfd, buffer, 4100, MSG_MORE);\\n        sendfile(sfd, dfd, NULL, 1024);\\n\\nFix this by only adding transhdrlen into the length if the write queue is\\nempty in l2tp_ip6_sendmsg(), analogously to how UDP does things.\\n\\nl2tp_ip_sendmsg() looks like it won\u0027t suffer from this problem as it builds\\nthe UDP packet itself.\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: ipv4, ipv6: se corrigi\u00f3 el manejo de transhdrlen en __ip{,6}_append_data() Incluir el transhdrlen en longitud es un problema cuando el paquete est\u00e1 parcialmente lleno (por ejemplo, algo como enviar(MSG_MORE ) sucedi\u00f3 anteriormente) al agregarlo a un paquete IPv4 o IPv6, ya que no queremos repetir el encabezado de transporte ni contabilizarlo dos veces. Esto puede suceder en algunas circunstancias, como al realizar un empalme en un z\u00f3calo L2TP. El s\u00edntoma observado es una advertencia en __ip6_append_data(): ADVERTENCIA: CPU: 1 PID: 5042 en net/ipv6/ip6_output.c:1800 __ip6_append_data.isra.0+0x1be8/0x47f0 net/ipv6/ip6_output.c:1800 que ocurre cuando MSG_SPLICE_PAGES se utiliza para agregar m\u00e1s datos a un skbuff que ya est\u00e1 parcialmente ocupado. La advertencia se produce cuando \u0027copiar\u0027 es mayor que la cantidad de datos en el iterador del mensaje. Esto se debe a que la longitud solicitada incluye la longitud del encabezado de transporte cuando no deber\u00eda hacerlo. Esto puede desencadenarse, por ejemplo: sfd = socket(AF_INET6, SOCK_DGRAM, IPPROTO_L2TP); enlazar(sfd, ...); // ::1 conectar(sfd, ...); // ::1 puerto 7 enviar(sfd, buffer, 4100, MSG_MORE); enviar archivo (sfd, dfd, NULL, 1024); Solucione este problema agregando solo transhdrlen a la longitud si la cola de escritura est\u00e1 vac\u00eda en l2tp_ip6_sendmsg(), de manera an\u00e1loga a c\u00f3mo hace las cosas UDP. Parece que l2tp_ip_sendmsg() no sufrir\u00e1 este problema ya que construye el paquete UDP por s\u00ed mismo.\"}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/1fc793d68d50dee4782ef2e808913d5dd880bcc6\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/559d697c5d072593d22b3e0bd8b8081108aeaf59\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/7626b9fed53092aa2147978070e610ecb61af844\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/96b2e1090397217839fcd6c9b6d8f5d439e705ed\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/9d4c75800f61e5d75c1659ba201b6c0c7ead3070\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/cd1189956393bf850b2e275e37411855d3bd86bb\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/f6a7182179c0ed788e3755ee2ed18c888ddcc33f\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/fe80658c08e3001c80c5533cd41abfbb0e0e28fd\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/1fc793d68d50dee4782ef2e808913d5dd880bcc6\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\"},{\"url\":\"https://git.kernel.org/stable/c/559d697c5d072593d22b3e0bd8b8081108aeaf59\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\"},{\"url\":\"https://git.kernel.org/stable/c/7626b9fed53092aa2147978070e610ecb61af844\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\"},{\"url\":\"https://git.kernel.org/stable/c/96b2e1090397217839fcd6c9b6d8f5d439e705ed\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\"},{\"url\":\"https://git.kernel.org/stable/c/9d4c75800f61e5d75c1659ba201b6c0c7ead3070\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\"},{\"url\":\"https://git.kernel.org/stable/c/cd1189956393bf850b2e275e37411855d3bd86bb\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\"},{\"url\":\"https://git.kernel.org/stable/c/f6a7182179c0ed788e3755ee2ed18c888ddcc33f\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\"},{\"url\":\"https://git.kernel.org/stable/c/fe80658c08e3001c80c5533cd41abfbb0e0e28fd\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\"}]}}"
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}


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