GHSA-XRFX-4WV5-78WW

Vulnerability from github – Published: 2022-05-13 01:48 – Updated: 2024-03-21 03:33
VLAI
Details

** DISPUTED ** Linux Kernel version 3.18 to 4.16 incorrectly handles an SG_IO ioctl on /dev/sg0 with dxfer_direction=SG_DXFER_FROM_DEV and an empty 6-byte cmdp. This may lead to copying up to 1000 kernel heap pages to the userspace. This has been fixed upstream in https://github.com/torvalds/linux/commit/a45b599ad808c3c982fdcdc12b0b8611c2f92824 already. The problem has limited scope, as users don't usually have permissions to access SCSI devices. On the other hand, e.g. the Nero user manual suggests doing chmod o+r+w /dev/sg* to make the devices accessible. NOTE: third parties dispute the relevance of this report, noting that the requirement for an attacker to have both the CAP_SYS_ADMIN and CAP_SYS_RAWIO capabilities makes it "virtually impossible to exploit."

Severity
5.3 (Medium)
CVSS:3.0/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N
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{
  "affected": [],
  "aliases": [
    "CVE-2018-1000204"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2018-06-26T14:29:00Z",
    "severity": "MODERATE"
  },
  "details": "** DISPUTED ** Linux Kernel version 3.18 to 4.16 incorrectly handles an SG_IO ioctl on /dev/sg0 with dxfer_direction=SG_DXFER_FROM_DEV and an empty 6-byte cmdp. This may lead to copying up to 1000 kernel heap pages to the userspace. This has been fixed upstream in https://github.com/torvalds/linux/commit/a45b599ad808c3c982fdcdc12b0b8611c2f92824 already. The problem has limited scope, as users don\u0027t usually have permissions to access SCSI devices. On the other hand, e.g. the Nero user manual suggests doing `chmod o+r+w /dev/sg*` to make the devices accessible. NOTE: third parties dispute the relevance of this report, noting that the requirement for an attacker to have both the CAP_SYS_ADMIN and CAP_SYS_RAWIO capabilities makes it \"virtually impossible to exploit.\"",
  "id": "GHSA-xrfx-4wv5-78ww",
  "modified": "2024-03-21T03:33:27Z",
  "published": "2022-05-13T01:48:34Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2018-1000204"
    },
    {
      "type": "WEB",
      "url": "https://github.com/torvalds/linux/commit/a45b599ad808c3c982fdcdc12b0b8611c2f92824"
    },
    {
      "type": "WEB",
      "url": "https://access.redhat.com/errata/RHSA-2018:2948"
    },
    {
      "type": "WEB",
      "url": "https://lists.debian.org/debian-lts-announce/2018/07/msg00015.html"
    },
    {
      "type": "WEB",
      "url": "https://lists.debian.org/debian-lts-announce/2018/07/msg00016.html"
    },
    {
      "type": "WEB",
      "url": "https://lists.debian.org/debian-lts-announce/2018/07/msg00020.html"
    },
    {
      "type": "WEB",
      "url": "https://usn.ubuntu.com/3696-1"
    },
    {
      "type": "WEB",
      "url": "https://usn.ubuntu.com/3696-2"
    },
    {
      "type": "WEB",
      "url": "https://usn.ubuntu.com/3752-1"
    },
    {
      "type": "WEB",
      "url": "https://usn.ubuntu.com/3752-2"
    },
    {
      "type": "WEB",
      "url": "https://usn.ubuntu.com/3752-3"
    },
    {
      "type": "WEB",
      "url": "https://usn.ubuntu.com/3754-1"
    },
    {
      "type": "WEB",
      "url": "http://lists.opensuse.org/opensuse-security-announce/2019-05/msg00043.html"
    },
    {
      "type": "WEB",
      "url": "http://www.openwall.com/lists/oss-security/2018/06/26/3"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.0/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N",
      "type": "CVSS_V3"
    }
  ]
}



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