CVE-2023-52527

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.

CVSS v3 5.5 MEDIUM

5.5^/10

CVSS v3 : MEDIUM

V3 Legend

Vector :

Exploitability : 1.8 / Impact : 3.6

Attack Vector LOCAL

Attack Complexity LOW

Privileges Required LOW

User Interaction NONE

Confidentiality Impact NONE

Integrity Impact NONE

Availability Impact HIGH

Scope UNCHANGED

References

Link	Resource
https://git.kernel.org/stable/c/1fc793d68d50dee4782ef2e808913d5dd880bcc6	Patch
https://git.kernel.org/stable/c/559d697c5d072593d22b3e0bd8b8081108aeaf59	Patch
https://git.kernel.org/stable/c/7626b9fed53092aa2147978070e610ecb61af844	Patch
https://git.kernel.org/stable/c/96b2e1090397217839fcd6c9b6d8f5d439e705ed	Patch
https://git.kernel.org/stable/c/9d4c75800f61e5d75c1659ba201b6c0c7ead3070	Patch
https://git.kernel.org/stable/c/cd1189956393bf850b2e275e37411855d3bd86bb	Patch
https://git.kernel.org/stable/c/f6a7182179c0ed788e3755ee2ed18c888ddcc33f	Patch
https://git.kernel.org/stable/c/fe80658c08e3001c80c5533cd41abfbb0e0e28fd	Patch
https://git.kernel.org/stable/c/1fc793d68d50dee4782ef2e808913d5dd880bcc6	Patch
https://git.kernel.org/stable/c/559d697c5d072593d22b3e0bd8b8081108aeaf59	Patch
https://git.kernel.org/stable/c/7626b9fed53092aa2147978070e610ecb61af844	Patch
https://git.kernel.org/stable/c/96b2e1090397217839fcd6c9b6d8f5d439e705ed	Patch
https://git.kernel.org/stable/c/9d4c75800f61e5d75c1659ba201b6c0c7ead3070	Patch
https://git.kernel.org/stable/c/cd1189956393bf850b2e275e37411855d3bd86bb	Patch
https://git.kernel.org/stable/c/f6a7182179c0ed788e3755ee2ed18c888ddcc33f	Patch
https://git.kernel.org/stable/c/fe80658c08e3001c80c5533cd41abfbb0e0e28fd	Patch

Configurations

Configuration 1 (hide)

OR	cpe:2.3:o:linux:linux_kernel::::::::
	cpe:2.3:o:linux:linux_kernel::::::::
	cpe:2.3:o:linux:linux_kernel::::::::
	cpe:2.3:o:linux:linux_kernel::::::::
	cpe:2.3:o:linux:linux_kernel::::::::
	cpe:2.3:o:linux:linux_kernel::::::::
	cpe:2.3:o:linux:linux_kernel::::::::
	cpe:2.3:o:linux:linux_kernel:6.6:rc1::::::
	cpe:2.3:o:linux:linux_kernel:6.6:rc2::::::
	cpe:2.3:o:linux:linux_kernel:6.6:rc3::::::
	cpe:2.3:o:linux:linux_kernel:6.6:rc4::::::

History

13 Jan 2025, 20:39

Type	Values Removed	Values Added
References	~~() https://git.kernel.org/stable/c/1fc793d68d50dee4782ef2e808913d5dd880bcc6 -~~	() https://git.kernel.org/stable/c/1fc793d68d50dee4782ef2e808913d5dd880bcc6 - Patch
References	~~() https://git.kernel.org/stable/c/559d697c5d072593d22b3e0bd8b8081108aeaf59 -~~	() https://git.kernel.org/stable/c/559d697c5d072593d22b3e0bd8b8081108aeaf59 - Patch
References	~~() https://git.kernel.org/stable/c/7626b9fed53092aa2147978070e610ecb61af844 -~~	() https://git.kernel.org/stable/c/7626b9fed53092aa2147978070e610ecb61af844 - Patch
References	~~() https://git.kernel.org/stable/c/96b2e1090397217839fcd6c9b6d8f5d439e705ed -~~	() https://git.kernel.org/stable/c/96b2e1090397217839fcd6c9b6d8f5d439e705ed - Patch
References	~~() https://git.kernel.org/stable/c/9d4c75800f61e5d75c1659ba201b6c0c7ead3070 -~~	() https://git.kernel.org/stable/c/9d4c75800f61e5d75c1659ba201b6c0c7ead3070 - Patch
References	~~() https://git.kernel.org/stable/c/cd1189956393bf850b2e275e37411855d3bd86bb -~~	() https://git.kernel.org/stable/c/cd1189956393bf850b2e275e37411855d3bd86bb - Patch
References	~~() https://git.kernel.org/stable/c/f6a7182179c0ed788e3755ee2ed18c888ddcc33f -~~	() https://git.kernel.org/stable/c/f6a7182179c0ed788e3755ee2ed18c888ddcc33f - Patch
References	~~() https://git.kernel.org/stable/c/fe80658c08e3001c80c5533cd41abfbb0e0e28fd -~~	() https://git.kernel.org/stable/c/fe80658c08e3001c80c5533cd41abfbb0e0e28fd - Patch
CWE		NVD-CWE-Other
CPE		cpe:2.3:o:linux:linux_kernel:6.6:rc2:::::: cpe:2.3:o:linux:linux_kernel:6.6:rc4:::::: cpe:2.3:o:linux:linux_kernel:6.6:rc1:::::: cpe:2.3:o:linux:linux_kernel:6.6:rc3:::::: cpe:2.3:o:linux:linux_kernel::::::::
First Time		Linux Linux linux Kernel
CVSS	v2 : ~~unknown~~ v3 : ~~unknown~~	v2 : unknown v3 : 5.5

21 Nov 2024, 08:39

Type	Values Removed	Values Added
References	~~() https://git.kernel.org/stable/c/1fc793d68d50dee4782ef2e808913d5dd880bcc6 -~~	() https://git.kernel.org/stable/c/1fc793d68d50dee4782ef2e808913d5dd880bcc6 -
References	~~() https://git.kernel.org/stable/c/559d697c5d072593d22b3e0bd8b8081108aeaf59 -~~	() https://git.kernel.org/stable/c/559d697c5d072593d22b3e0bd8b8081108aeaf59 -
References	~~() https://git.kernel.org/stable/c/7626b9fed53092aa2147978070e610ecb61af844 -~~	() https://git.kernel.org/stable/c/7626b9fed53092aa2147978070e610ecb61af844 -
References	~~() https://git.kernel.org/stable/c/96b2e1090397217839fcd6c9b6d8f5d439e705ed -~~	() https://git.kernel.org/stable/c/96b2e1090397217839fcd6c9b6d8f5d439e705ed -
References	~~() https://git.kernel.org/stable/c/9d4c75800f61e5d75c1659ba201b6c0c7ead3070 -~~	() https://git.kernel.org/stable/c/9d4c75800f61e5d75c1659ba201b6c0c7ead3070 -
References	~~() https://git.kernel.org/stable/c/cd1189956393bf850b2e275e37411855d3bd86bb -~~	() https://git.kernel.org/stable/c/cd1189956393bf850b2e275e37411855d3bd86bb -
References	~~() https://git.kernel.org/stable/c/f6a7182179c0ed788e3755ee2ed18c888ddcc33f -~~	() https://git.kernel.org/stable/c/f6a7182179c0ed788e3755ee2ed18c888ddcc33f -
References	~~() https://git.kernel.org/stable/c/fe80658c08e3001c80c5533cd41abfbb0e0e28fd -~~	() https://git.kernel.org/stable/c/fe80658c08e3001c80c5533cd41abfbb0e0e28fd -
Summary		(es) En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: ipv4, ipv6: se corrigió el manejo de transhdrlen en __ip{,6}_append_data() Incluir el transhdrlen en longitud es un problema cuando el paquete está parcialmente lleno (por ejemplo, algo como enviar(MSG_MORE ) sucedió 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 zócalo L2TP. El síntoma 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 más datos a un skbuff que ya está parcialmente ocupado. La advertencia se produce cuando 'copiar' 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 debería 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 está vacía en l2tp_ip6_sendmsg(), de manera análoga a cómo hace las cosas UDP. Parece que l2tp_ip_sendmsg() no sufrirá este problema ya que construye el paquete UDP por sí mismo.

02 Mar 2024, 22:15

Type	Values Removed	Values Added
New CVE

Information

Published : 2024-03-02 22:15

Updated : 2025-01-13 20:39

NVD link : CVE-2023-52527

Mitre link : CVE-2023-52527

CVE.ORG link : CVE-2023-52527

JSON object : View

Products Affected

linux

linux_kernel

CWE

NVD-CWE-Other

{"id": "CVE-2023-52527", "cveTags": [], "metrics": {"cvssMetricV31": [{"type": "Primary", "source": "nvd@nist.gov", "cvssData": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 5.5, "attackVector": "LOCAL", "baseSeverity": "MEDIUM", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "integrityImpact": "NONE", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "HIGH", "privilegesRequired": "LOW", "confidentialityImpact": "NONE"}, "impactScore": 3.6, "exploitabilityScore": 1.8}]}, "published": "2024-03-02T22:15:48.403", "references": [{"url": "https://git.kernel.org/stable/c/1fc793d68d50dee4782ef2e808913d5dd880bcc6", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/559d697c5d072593d22b3e0bd8b8081108aeaf59", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/7626b9fed53092aa2147978070e610ecb61af844", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/96b2e1090397217839fcd6c9b6d8f5d439e705ed", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/9d4c75800f61e5d75c1659ba201b6c0c7ead3070", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/cd1189956393bf850b2e275e37411855d3bd86bb", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/f6a7182179c0ed788e3755ee2ed18c888ddcc33f", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/fe80658c08e3001c80c5533cd41abfbb0e0e28fd", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/1fc793d68d50dee4782ef2e808913d5dd880bcc6", "tags": ["Patch"], "source": "af854a3a-2127-422b-91ae-364da2661108"}, {"url": "https://git.kernel.org/stable/c/559d697c5d072593d22b3e0bd8b8081108aeaf59", "tags": ["Patch"], "source": "af854a3a-2127-422b-91ae-364da2661108"}, {"url": "https://git.kernel.org/stable/c/7626b9fed53092aa2147978070e610ecb61af844", "tags": ["Patch"], "source": "af854a3a-2127-422b-91ae-364da2661108"}, {"url": "https://git.kernel.org/stable/c/96b2e1090397217839fcd6c9b6d8f5d439e705ed", "tags": ["Patch"], "source": "af854a3a-2127-422b-91ae-364da2661108"}, {"url": "https://git.kernel.org/stable/c/9d4c75800f61e5d75c1659ba201b6c0c7ead3070", "tags": ["Patch"], "source": "af854a3a-2127-422b-91ae-364da2661108"}, {"url": "https://git.kernel.org/stable/c/cd1189956393bf850b2e275e37411855d3bd86bb", "tags": ["Patch"], "source": "af854a3a-2127-422b-91ae-364da2661108"}, {"url": "https://git.kernel.org/stable/c/f6a7182179c0ed788e3755ee2ed18c888ddcc33f", "tags": ["Patch"], "source": "af854a3a-2127-422b-91ae-364da2661108"}, {"url": "https://git.kernel.org/stable/c/fe80658c08e3001c80c5533cd41abfbb0e0e28fd", "tags": ["Patch"], "source": "af854a3a-2127-422b-91ae-364da2661108"}], "vulnStatus": "Analyzed", "weaknesses": [{"type": "Primary", "source": "nvd@nist.gov", "description": [{"lang": "en", "value": "NVD-CWE-Other"}]}], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nipv4, ipv6: Fix handling of transhdrlen in __ip{,6}_append_data()\n\nIncluding the transhdrlen in length is a problem when the packet is\npartially filled (e.g. something like send(MSG_MORE) happened previously)\nwhen appending to an IPv4 or IPv6 packet as we don't want to repeat the\ntransport header or account for it twice. 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 'copy' 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't. 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't 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 'copiar' 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."}], "lastModified": "2025-01-13T20:39:56.607", "configurations": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "CC009A79-D1F2-492D-AC37-5EF2DECD6C54", "versionEndExcluding": "4.14.327", "versionStartIncluding": "3.5"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "78DAD65C-4893-461B-91B2-F4E7C212F140", "versionEndExcluding": "4.19.296", "versionStartIncluding": "4.15"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "1208C905-CEAA-49F2-B357-72A5185B2656", "versionEndExcluding": "5.4.258", "versionStartIncluding": "4.20"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "66D916C3-4087-44FF-9CD9-D2826BCC9E3D", "versionEndExcluding": "5.10.198", "versionStartIncluding": "5.5"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "53447712-3158-498E-A077-9FA1898E6464", "versionEndExcluding": "5.15.135", "versionStartIncluding": "5.11"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "8629E5D1-351D-4D4B-8D05-E10BD4A1CFD0", "versionEndExcluding": "6.1.57", "versionStartIncluding": "5.16"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "830A824C-F212-4FDC-ADEF-0EBEC6B2365B", "versionEndExcluding": "6.5.7", "versionStartIncluding": "6.2"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:6.6:rc1:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "84267A4F-DBC2-444F-B41D-69E15E1BEC97"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:6.6:rc2:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "FB440208-241C-4246-9A83-C1715C0DAA6C"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:6.6:rc3:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "0DC421F1-3D5A-4BEF-BF76-4E468985D20B"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:6.6:rc4:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "00AB783B-BE05-40E8-9A55-6AA457D95031"}], "operator": "OR"}]}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}

5.5 /10