ubuntu-cve-2021-29923
Vulnerability from osv_ubuntu
Published
2021-08-07 17:15
Modified
2025-10-24 04:50
Summary
Details

Go before 1.17 does not properly consider extraneous zero characters at the beginning of an IP address octet, which (in some situations) allows attackers to bypass access control that is based on IP addresses, because of unexpected octal interpretation. This affects net.ParseIP and net.ParseCIDR.

Severity
7.5 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
N/A (UNKNOWN)
medium
References
To clipboard 

{
  "affected": [
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      "ecosystem_specific": {
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        "1.16.2-0ubuntu1~20.04.1+esm1"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
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            "binary_version": "1.13.8-1ubuntu2.22.04.2"
          },
          {
            "binary_name": "golang-1.13-go",
            "binary_version": "1.13.8-1ubuntu2.22.04.2"
          },
          {
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        ]
      },
      "package": {
        "ecosystem": "Ubuntu:Pro:22.04:LTS",
        "name": "golang-1.13",
        "purl": "pkg:deb/ubuntu/golang-1.13@1.13.8-1ubuntu2.22.04.2?arch=source\u0026distro=esm-apps/jammy"
      },
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        "1.13.8-1ubuntu2.22.04.1",
        "1.13.8-1ubuntu2.22.04.1+esm1",
        "1.13.8-1ubuntu2.22.04.2"
      ]
    }
  ],
  "aliases": [],
  "details": "Go before 1.17 does not properly consider extraneous zero characters at the beginning of an IP address octet, which (in some situations) allows attackers to bypass access control that is based on IP addresses, because of unexpected octal interpretation. This affects net.ParseIP and net.ParseCIDR.",
  "id": "UBUNTU-CVE-2021-29923",
  "modified": "2025-10-24T04:50:16Z",
  "published": "2021-08-07T17:15:00Z",
  "references": [
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2021-29923"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/golang/go/issues/30999"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/golang/go/issues/43389"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/sickcodes/security/blob/master/advisories/SICK-2021-016.md"
    },
    {
      "type": "REPORT",
      "url": "https://go-review.googlesource.com/c/go/+/325829/"
    },
    {
      "type": "REPORT",
      "url": "https://defcon.org/html/defcon-29/dc-29-speakers.html#kaoudis"
    },
    {
      "type": "REPORT",
      "url": "https://golang.org/pkg/net/#ParseCIDR"
    },
    {
      "type": "REPORT",
      "url": "https://www.cve.org/CVERecord?id=CVE-2021-29923"
    }
  ],
  "related": [],
  "schema_version": "1.7.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N",
      "type": "CVSS_V3"
    },
    {
      "score": "medium",
      "type": "Ubuntu"
    }
  ],
  "upstream": [
    "CVE-2021-29923"
  ]
}



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  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
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