PYSEC-2026-645

Vulnerability from pysec - Published: 2026-07-02 14:13 - Updated: 2026-07-06 07:36
VLAI
Details

A flaw was found in instack-undercloud 7.2.0 as packaged in Red Hat OpenStack Platform Pike, 6.1.0 as packaged in Red Hat OpenStack Platform Oacta, 5.3.0 as packaged in Red Hat OpenStack Newton, where pre-install and security policy scripts used insecure temporary files. A local user could exploit this flaw to conduct a symbolic-link attack, allowing them to overwrite the contents of arbitrary files.

Severity
6.4 (Medium)
CVSS:3.0/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:L/A:N
Impacted products
Name purl
instack-undercloud pkg:pypi/instack-undercloud
Aliases
To clipboard 

{
  "affected": [
    {
      "package": {
        "ecosystem": "PyPI",
        "name": "instack-undercloud",
        "purl": "pkg:pypi/instack-undercloud"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "last_affected": "7.2.0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "4.0.1.dev90",
        "4.1.0",
        "4.2.0",
        "4.2.1",
        "5.0.0",
        "5.0.0.0b1",
        "5.0.0.0b2",
        "5.0.0.0b3",
        "5.0.0.0rc1",
        "5.0.0.0rc2",
        "5.0.0.0rc3",
        "5.1.0",
        "5.2.0",
        "5.3.0",
        "5.3.1",
        "5.3.10",
        "5.3.2",
        "5.3.3",
        "5.3.4",
        "5.3.5",
        "5.3.6",
        "5.3.7",
        "5.3.8",
        "5.3.9",
        "6.0.0",
        "6.0.0.0b2",
        "6.0.0.0rc1",
        "6.0.0.0rc2",
        "6.1.0",
        "6.1.1",
        "6.1.2",
        "6.1.3",
        "6.1.4",
        "6.1.5",
        "6.1.6",
        "6.1.7",
        "6.1.8",
        "7.0.0",
        "7.0.0.0b1",
        "7.1.0",
        "7.2.0"
      ]
    }
  ],
  "aliases": [
    "CVE-2017-7549",
    "GHSA-53wm-97p6-582f"
  ],
  "details": "A flaw was found in instack-undercloud 7.2.0 as packaged in Red Hat OpenStack Platform Pike, 6.1.0 as packaged in Red Hat OpenStack Platform Oacta, 5.3.0 as packaged in Red Hat OpenStack Newton, where pre-install and security policy scripts used insecure temporary files. A local user could exploit this flaw to conduct a symbolic-link attack, allowing them to overwrite the contents of arbitrary files.",
  "id": "PYSEC-2026-645",
  "modified": "2026-07-06T07:36:38.105356Z",
  "published": "2026-07-02T14:13:22.649014Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2017-7549"
    },
    {
      "type": "WEB",
      "url": "https://access.redhat.com/errata/RHSA-2017:2557"
    },
    {
      "type": "WEB",
      "url": "https://access.redhat.com/errata/RHSA-2017:2649"
    },
    {
      "type": "WEB",
      "url": "https://access.redhat.com/errata/RHSA-2017:2687"
    },
    {
      "type": "WEB",
      "url": "https://access.redhat.com/errata/RHSA-2017:2693"
    },
    {
      "type": "WEB",
      "url": "https://access.redhat.com/errata/RHSA-2017:2726"
    },
    {
      "type": "WEB",
      "url": "https://access.redhat.com/security/cve/CVE-2017-7549"
    },
    {
      "type": "WEB",
      "url": "https://bugzilla.redhat.com/show_bug.cgi?id=1477403"
    },
    {
      "type": "WEB",
      "url": "https://github.com/pypa/advisory-database/tree/main/vulns/instack/PYSEC-2017-152.yaml"
    },
    {
      "type": "WEB",
      "url": "https://opendev.org/openstack/instack-undercloud"
    },
    {
      "type": "WEB",
      "url": "https://web.archive.org/web/20170907040549/http://www.securityfocus.com/bid/100407"
    },
    {
      "type": "WEB",
      "url": "http://www.securityfocus.com/bid/100407"
    },
    {
      "type": "PACKAGE",
      "url": "https://pypi.org/project/instack-undercloud"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/advisories/GHSA-53wm-97p6-582f"
    }
  ],
  "severity": [
    {
      "score": "CVSS:3.0/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:L/A:N",
      "type": "CVSS_V3"
    }
  ],
  "summary": "instack-undercloud vulnerable to symlink attack on tmp files"
}


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