ghsa-rxhv-mw63-w89c
Vulnerability from github
Published
2024-10-21 18:30
Modified
2024-11-12 21:30
Severity ?
5.5 (Medium) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Details

In the Linux kernel, the following vulnerability has been resolved:

net: add more sanity checks to qdisc_pkt_len_init()

One path takes care of SKB_GSO_DODGY, assuming skb->len is bigger than hdr_len.

virtio_net_hdr_to_skb() does not fully dissect TCP headers, it only make sure it is at least 20 bytes.

It is possible for an user to provide a malicious 'GSO' packet, total length of 80 bytes.

  • 20 bytes of IPv4 header
  • 60 bytes TCP header
  • a small gso_size like 8

virtio_net_hdr_to_skb() would declare this packet as a normal GSO packet, because it would see 40 bytes of payload, bigger than gso_size.

We need to make detect this case to not underflow qdisc_skb_cb(skb)->pkt_len.

Show details on source website

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{
   affected: [],
   aliases: [
      "CVE-2024-49948",
   ],
   database_specific: {
      cwe_ids: [],
      github_reviewed: false,
      github_reviewed_at: null,
      nvd_published_at: "2024-10-21T18:15:16Z",
      severity: "MODERATE",
   },
   details: "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: add more sanity checks to qdisc_pkt_len_init()\n\nOne path takes care of SKB_GSO_DODGY, assuming\nskb->len is bigger than hdr_len.\n\nvirtio_net_hdr_to_skb() does not fully dissect TCP headers,\nit only make sure it is at least 20 bytes.\n\nIt is possible for an user to provide a malicious 'GSO' packet,\ntotal length of 80 bytes.\n\n- 20 bytes of IPv4 header\n- 60 bytes TCP header\n- a small gso_size like 8\n\nvirtio_net_hdr_to_skb() would declare this packet as a normal\nGSO packet, because it would see 40 bytes of payload,\nbigger than gso_size.\n\nWe need to make detect this case to not underflow\nqdisc_skb_cb(skb)->pkt_len.",
   id: "GHSA-rxhv-mw63-w89c",
   modified: "2024-11-12T21:30:50Z",
   published: "2024-10-21T18:30:58Z",
   references: [
      {
         type: "ADVISORY",
         url: "https://nvd.nist.gov/vuln/detail/CVE-2024-49948",
      },
      {
         type: "WEB",
         url: "https://git.kernel.org/stable/c/1eebe602a8d8264a12e35e39d0645fa88dbbacdd",
      },
      {
         type: "WEB",
         url: "https://git.kernel.org/stable/c/2415f465730e48b6e38da1c7c097317bf5dd2d20",
      },
      {
         type: "WEB",
         url: "https://git.kernel.org/stable/c/27a8fabc54d2f960d47bdfbebf2bdc6e8a92a4c4",
      },
      {
         type: "WEB",
         url: "https://git.kernel.org/stable/c/473426a1d53a68dd1e718e6cd00d57936993fa6c",
      },
      {
         type: "WEB",
         url: "https://git.kernel.org/stable/c/566a931a1436d0e0ad13708ea55479b95426213c",
      },
      {
         type: "WEB",
         url: "https://git.kernel.org/stable/c/9b0ee571d20a238a22722126abdfde61f1b2bdd0",
      },
      {
         type: "WEB",
         url: "https://git.kernel.org/stable/c/ab9a9a9e9647392a19e7a885b08000e89c86b535",
      },
      {
         type: "WEB",
         url: "https://git.kernel.org/stable/c/d7d1a28f5dd57b4d83def876f8d7b4403bd37df9",
      },
      {
         type: "WEB",
         url: "https://git.kernel.org/stable/c/ff1c3cadcf405ab37dd91418a62a7acecf3bc5e2",
      },
   ],
   schema_version: "1.4.0",
   severity: [
      {
         score: "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
         type: "CVSS_V3",
      },
   ],
}


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