CVE-2024-43817

{"id": "CVE-2024-43817", "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": "2024-08-17T10:15:08.010", "references": [{"url": "https://git.kernel.org/stable/c/27874ca77bd2b05a3779c7b3a5c75d8dd7f0b40f", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/5b1997487a3f3373b0f580c8a20b56c1b64b0775", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/90d41ebe0cd4635f6410471efc1dd71b33e894cf", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/e269d79c7d35aa3808b1f3c1737d63dab504ddc8", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/e9164903b8b303c34723177b02fe91e49e3c4cd7", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "vulnStatus": "Analyzed", "weaknesses": [{"type": "Primary", "source": "nvd@nist.gov", "description": [{"lang": "en", "value": "NVD-CWE-noinfo"}]}], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: missing check virtio\n\nTwo missing check in virtio_net_hdr_to_skb() allowed syzbot\nto crash kernels again\n\n1. After the skb_segment function the buffer may become non-linear\n(nr_frags != 0), but since the SKBTX_SHARED_FRAG flag is not set anywhere\nthe __skb_linearize function will not be executed, then the buffer will\nremain non-linear. Then the condition (offset >= skb_headlen(skb))\nbecomes true, which causes WARN_ON_ONCE in skb_checksum_help.\n\n2. The struct sk_buff and struct virtio_net_hdr members must be\nmathematically related.\n(gso_size) must be greater than (needed) otherwise WARN_ON_ONCE.\n(remainder) must be greater than (needed) otherwise WARN_ON_ONCE.\n(remainder) may be 0 if division is without remainder.\n\noffset+2 (4191) > skb_headlen() (1116)\nWARNING: CPU: 1 PID: 5084 at net/core/dev.c:3303 skb_checksum_help+0x5e2/0x740 net/core/dev.c:3303\nModules linked in:\nCPU: 1 PID: 5084 Comm: syz-executor336 Not tainted 6.7.0-rc3-syzkaller-00014-gdf60cee26a2e #0\nHardware name: Google Compute Engine/Google Compute Engine, BIOS Google 11/10/2023\nRIP: 0010:skb_checksum_help+0x5e2/0x740 net/core/dev.c:3303\nCode: 89 e8 83 e0 07 83 c0 03 38 d0 7c 08 84 d2 0f 85 52 01 00 00 44 89 e2 2b 53 74 4c 89 ee 48 c7 c7 40 57 e9 8b e8 af 8f dd f8 90 <0f> 0b 90 90 e9 87 fe ff ff e8 40 0f 6e f9 e9 4b fa ff ff 48 89 ef\nRSP: 0018:ffffc90003a9f338 EFLAGS: 00010286\nRAX: 0000000000000000 RBX: ffff888025125780 RCX: ffffffff814db209\nRDX: ffff888015393b80 RSI: ffffffff814db216 RDI: 0000000000000001\nRBP: ffff8880251257f4 R08: 0000000000000001 R09: 0000000000000000\nR10: 0000000000000000 R11: 0000000000000001 R12: 000000000000045c\nR13: 000000000000105f R14: ffff8880251257f0 R15: 000000000000105d\nFS: 0000555555c24380(0000) GS:ffff8880b9900000(0000) knlGS:0000000000000000\nCS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033\nCR2: 000000002000f000 CR3: 0000000023151000 CR4: 00000000003506f0\nDR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000\nDR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400\nCall Trace:\n <TASK>\n ip_do_fragment+0xa1b/0x18b0 net/ipv4/ip_output.c:777\n ip_fragment.constprop.0+0x161/0x230 net/ipv4/ip_output.c:584\n ip_finish_output_gso net/ipv4/ip_output.c:286 [inline]\n __ip_finish_output net/ipv4/ip_output.c:308 [inline]\n __ip_finish_output+0x49c/0x650 net/ipv4/ip_output.c:295\n ip_finish_output+0x31/0x310 net/ipv4/ip_output.c:323\n NF_HOOK_COND include/linux/netfilter.h:303 [inline]\n ip_output+0x13b/0x2a0 net/ipv4/ip_output.c:433\n dst_output include/net/dst.h:451 [inline]\n ip_local_out+0xaf/0x1a0 net/ipv4/ip_output.c:129\n iptunnel_xmit+0x5b4/0x9b0 net/ipv4/ip_tunnel_core.c:82\n ipip6_tunnel_xmit net/ipv6/sit.c:1034 [inline]\n sit_tunnel_xmit+0xed2/0x28f0 net/ipv6/sit.c:1076\n __netdev_start_xmit include/linux/netdevice.h:4940 [inline]\n netdev_start_xmit include/linux/netdevice.h:4954 [inline]\n xmit_one net/core/dev.c:3545 [inline]\n dev_hard_start_xmit+0x13d/0x6d0 net/core/dev.c:3561\n __dev_queue_xmit+0x7c1/0x3d60 net/core/dev.c:4346\n dev_queue_xmit include/linux/netdevice.h:3134 [inline]\n packet_xmit+0x257/0x380 net/packet/af_packet.c:276\n packet_snd net/packet/af_packet.c:3087 [inline]\n packet_sendmsg+0x24ca/0x5240 net/packet/af_packet.c:3119\n sock_sendmsg_nosec net/socket.c:730 [inline]\n __sock_sendmsg+0xd5/0x180 net/socket.c:745\n __sys_sendto+0x255/0x340 net/socket.c:2190\n __do_sys_sendto net/socket.c:2202 [inline]\n __se_sys_sendto net/socket.c:2198 [inline]\n __x64_sys_sendto+0xe0/0x1b0 net/socket.c:2198\n do_syscall_x64 arch/x86/entry/common.c:51 [inline]\n do_syscall_64+0x40/0x110 arch/x86/entry/common.c:82\n entry_SYSCALL_64_after_hwframe+0x63/0x6b\n\nFound by Linux Verification Center (linuxtesting.org) with Syzkaller"}, {"lang": "es", "value": "En el kernel de Linux, se resolvi\u00f3 la siguiente vulnerabilidad: net: falta de verificaci\u00f3n virtio Dos comprobaciones faltantes en virtio_net_hdr_to_skb() permitieron a syzbot bloquear los kernels nuevamente 1. Despu\u00e9s de la funci\u00f3n skb_segment, el b\u00fafer puede volverse no lineal (nr_frags! = 0), pero como el indicador SKBTX_SHARED_FRAG no est\u00e1 configurado en ning\u00fan lugar, la funci\u00f3n __skb_linearize no se ejecutar\u00e1, entonces el b\u00fafer permanecer\u00e1 no lineal. Entonces la condici\u00f3n (offset &gt;= skb_headlen(skb)) se vuelve verdadera, lo que provoca WARN_ON_ONCE en skb_checksum_help. 2. Los miembros de struct sk_buff y struct virtio_net_hdr deben estar relacionados matem\u00e1ticamente. (gso_size) debe ser mayor que (necesario); de lo contrario, WARN_ON_ONCE. (resto) debe ser mayor que (necesario); de lo contrario, WARN_ON_ONCE. (resto) puede ser 0 si la divisi\u00f3n no tiene resto. offset+2 (4191) &gt; skb_headlen() (1116) ADVERTENCIA: CPU: 1 PID: 5084 en net/core/dev.c:3303 skb_checksum_help+0x5e2/0x740 net/core/dev.c:3303 M\u00f3dulos vinculados en: CPU : 1 PID: 5084 Comm: syz-executor336 No contaminado 6.7.0-rc3-syzkaller-00014-gdf60cee26a2e #0 Nombre del hardware: Google Compute Engine/Google Compute Engine, BIOS Google 10/11/2023 RIP: 0010:skb_checksum_help+0x5e2 /0x740 net/core/dev.c:3303 C\u00f3digo: 89 e8 83 e0 07 83 c0 03 38 d0 7c 08 84 d2 0f 85 52 01 00 00 44 89 e2 2b 53 74 4c 89 ee 48 c7 c7 40 57 e9 8b e8 af 8f dd f8 90 &lt;0f&gt; 0b 90 90 e9 87 fe ff ff e8 40 0f 6e f9 e9 4b fa ff ff 48 89 ef RSP: 0018:ffffc90003a9f338 EFLAGS: 00010286 RAX: RBX: ffff888025125780 RCX: ffffffff814db209 RDX: ffff888015393b80 RSI : ffffffff814db216 RDI: 0000000000000001 RBP: ffff8880251257f4 R08: 0000000000000001 R09: 00000000000000000 R10: 0000000000000000 R11: 000000000001 R12: 000000000000045c R13: 000000000000105f R14: ffff8880251257f0 R15: 000000000000105d FS: 0000555555c24380(0000) 8880b9900000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000000002000f000 CR3: 0000000023151000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 00000 00000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Seguimiento de llamadas: ip_do_fragment+0xa1b/0x18b0 net/ipv4 /ip_output.c:777 ip_fragment.constprop.0+0x161/0x230 net/ipv4/ip_output.c:584 ip_finish_output_gso net/ipv4/ip_output.c:286 [en l\u00ednea] __ip_finish_output net/ipv4/ip_output.c:308 [en l\u00ednea] __ip_finish_output+0x49c/0x650 net/ipv4/ip_output.c:295 ip_finish_output+0x31/0x310 net/ipv4/ip_output.c:323 NF_HOOK_COND include/linux/netfilter.h:303 [en l\u00ednea] ip_output+0x13b/0x2a0 net/ipv4/ ip_output.c:433 dst_output include/net/dst.h:451 [en l\u00ednea] ip_local_out+0xaf/0x1a0 net/ipv4/ip_output.c:129 iptunnel_xmit+0x5b4/0x9b0 net/ipv4/ip_tunnel_core.c:82 ipip6_tunnel_xmit net/ipv6 /sit.c:1034 [en l\u00ednea] sit_tunnel_xmit+0xed2/0x28f0 net/ipv6/sit.c:1076 __netdev_start_xmit include/linux/netdevice.h:4940 [en l\u00ednea] netdev_start_xmit include/linux/netdevice.h:4954 [en l\u00ednea] xmit_one net/core/dev.c:3545 [en l\u00ednea] dev_hard_start_xmit+0x13d/0x6d0 net/core/dev.c:3561 __dev_queue_xmit+0x7c1/0x3d60 net/core/dev.c:4346 dev_queue_xmit include/linux/netdevice.h:3134 [en l\u00ednea] paquete_xmit+0x257/0x380 net/packet/af_packet.c:276 paquete_snd net/packet/af_packet.c:3087 [en l\u00ednea] paquete_sendmsg+0x24ca/0x5240 net/packet/af_packet.c:3119 sock_sendmsg_nosec net/socket.c :730 [en l\u00ednea] __sock_sendmsg+0xd5/0x180 net/socket.c:745 __sys_sendto+0x255/0x340 net/socket.c:2190 __do_sys_sendto net/socket.c:2202 [en l\u00ednea] __se_sys_sendto net/socket.c:2198 [en l\u00ednea ] __x64_sys_sendto+0xe0/0x1b0 net/socket.c:2198 do_syscall_x64 arch/x86/entry/common.c:51 [en l\u00ednea] do_syscall_64+0x40/0x110 arch/x86/entry/common.c:82 Entry_SYSCALL_64_after_hwframe+0x63/ 0x6b encontrado por el Centro de verificaci\u00f3n de Linux (linuxtesting.org) con Syzkaller"}], "lastModified": "2024-09-03T17:41:46.407", "configurations": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "1666B32A-662E-4BCD-AD39-98FBEB2BEBEC", "versionEndExcluding": "5.15.165", "versionStartIncluding": "5.12"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "E45EAC72-8329-4F99-8276-86AF9BB3496A", "versionEndExcluding": "6.1.103", "versionStartIncluding": "5.16"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "CC912330-6B41-4C6B-99AF-F3857FBACB6A", "versionEndExcluding": "6.6.44", "versionStartIncluding": "6.2"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "92D388F2-1EAF-4CFA-AC06-5B26D762EA7D", "versionEndExcluding": "6.10.3", "versionStartIncluding": "6.7"}], "operator": "OR"}]}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}