usn-4246-1
Vulnerability from osv_ubuntu
Published
2020-01-22 19:00
Modified
2026-04-27 14:11
Summary
zlib vulnerabilities
Details

It was discovered that zlib incorrectly handled pointer arithmetic. An attacker could use this issue to cause zlib to crash, resulting in a denial of service, or possibly execute arbitrary code. (CVE-2016-9840, CVE-2016-9841)

It was discovered that zlib incorrectly handled vectors involving left shifts of negative integers. An attacker could use this issue to cause zlib to crash, resulting in a denial of service, or possibly execute arbitrary code. (CVE-2016-9842)

It was discovered that zlib incorrectly handled vectors involving big-endian CRC calculation. An attacker could use this issue to cause zlib to crash, resulting in a denial of service, or possibly execute arbitrary code. (CVE-2016-9843)

References
To clipboard 

{
  "affected": [
    {
      "database_specific": {
        "cves_map": {
          "cves": [
            {
              "id": "CVE-2016-9840",
              "severity": [
                {
                  "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H",
                  "type": "CVSS_V3"
                },
                {
                  "score": "low",
                  "type": "Ubuntu"
                }
              ]
            },
            {
              "id": "CVE-2016-9841",
              "severity": [
                {
                  "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
                  "type": "CVSS_V3"
                },
                {
                  "score": "low",
                  "type": "Ubuntu"
                }
              ]
            },
            {
              "id": "CVE-2016-9842",
              "severity": [
                {
                  "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H",
                  "type": "CVSS_V3"
                },
                {
                  "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H",
                  "type": "CVSS_V3"
                },
                {
                  "score": "low",
                  "type": "Ubuntu"
                }
              ]
            },
            {
              "id": "CVE-2016-9843",
              "severity": [
                {
                  "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
                  "type": "CVSS_V3"
                },
                {
                  "score": "low",
                  "type": "Ubuntu"
                }
              ]
            }
          ],
          "ecosystem": "Ubuntu:16.04:LTS"
        }
      },
      "ecosystem_specific": {
        "availability": "No subscription required",
        "binaries": [
          {
            "binary_name": "lib32z1",
            "binary_version": "1:1.2.8.dfsg-2ubuntu4.3"
          },
          {
            "binary_name": "lib64z1",
            "binary_version": "1:1.2.8.dfsg-2ubuntu4.3"
          },
          {
            "binary_name": "libx32z1",
            "binary_version": "1:1.2.8.dfsg-2ubuntu4.3"
          },
          {
            "binary_name": "zlib1g",
            "binary_version": "1:1.2.8.dfsg-2ubuntu4.3"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:16.04:LTS",
        "name": "zlib",
        "purl": "pkg:deb/ubuntu/zlib@1:1.2.8.dfsg-2ubuntu4.3?arch=source\u0026distro=xenial"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "1:1.2.8.dfsg-2ubuntu4.3"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1:1.2.8.dfsg-2ubuntu4",
        "1:1.2.8.dfsg-2ubuntu4.1"
      ]
    }
  ],
  "aliases": [],
  "details": "\nIt was discovered that zlib incorrectly handled pointer arithmetic. An attacker\ncould use this issue to cause zlib to crash, resulting in a denial of\nservice, or possibly execute arbitrary code. (CVE-2016-9840, CVE-2016-9841)\n\nIt was discovered that zlib incorrectly handled vectors involving left shifts of\nnegative integers. An attacker could use this issue to cause zlib to\ncrash, resulting in a denial of service, or possibly execute arbitrary code.\n(CVE-2016-9842)\n\nIt was discovered that zlib incorrectly handled vectors involving big-endian CRC\ncalculation. An attacker could use this issue to cause zlib to crash,\nresulting in a denial of service, or possibly execute arbitrary code.\n(CVE-2016-9843)\n",
  "id": "USN-4246-1",
  "modified": "2026-04-27T14:11:25Z",
  "published": "2020-01-22T19:00:08Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://ubuntu.com/security/notices/USN-4246-1"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2016-9840"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2016-9841"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2016-9842"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2016-9843"
    }
  ],
  "related": [],
  "schema_version": "1.7.0",
  "summary": "zlib vulnerabilities",
  "upstream": [
    "UBUNTU-CVE-2016-9840",
    "UBUNTU-CVE-2016-9841",
    "UBUNTU-CVE-2016-9842",
    "UBUNTU-CVE-2016-9843"
  ]
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.