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High

Security advisory

Type: advisorySources: OSVCVE: CVE-2017-7572

The _checkPolkitPrivilege function in serviceHelper.py in Back In Time (aka backintime) 1.1.18 and earlier uses a deprecated polkit authorization method (unix-process) that is subject to a race condition (time of check, time of use). With this authorization method, the owner of a process requesting a polkit operation is checked by polkitd via /proc//status, by which time the requesting process may have been replaced by a different process with the same PID that has different privileges then the original requester.

Products
Not specified
Affected versions
Not specified
Fixed versions
Not specified
CVEs
CVE-2017-7572
Confirmed fixed CVEs
Not specified
Updated in this feed
31 Oct 2026, 10:19 UTC · Revision 1

Source evidence

CVE-2017-7572

core-osv · Original source

Published 6 Apr 2017, 18:59 UTC

The _checkPolkitPrivilege function in serviceHelper.py in Back In Time (aka backintime) 1.1.18 and earlier uses a deprecated polkit authorization method (unix-process) that is subject to a race condition (time of check, time of use). With this authorization method, the owner of a process requesting a polkit operation is checked by polkitd via /proc//status, by which time the requesting process may have been replaced by a different process with the same PID that has different privileges then the original requester.

osv:CVE-2017-7572
Complete source record
{
  "id": "d748da77ccecc385c6e3b1956d3137df513c61913cce95484b58e2d3971a0c04",
  "url": "https://osv.dev/vulnerability/CVE-2017-7572",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "CVE-2017-7572",
    "summary": "The _checkPolkitPrivilege function in serviceHelper.py in Back In Time (aka backintime) 1.1.18 and earlier uses a deprecated polkit authorization method (unix-process) that is subject to a race condition (time of check, time of use). With this authorization method, the owner of a process requesting a polkit operation is checked by polkitd via /proc//status, by which time the requesting process may have been replaced by a different process with the same PID that has different privileges then the original requester.",
    "evidence": "osv:CVE-2017-7572",
    "products": [],
    "severity": "high",
    "structured": {
      "id": "CVE-2017-7572",
      "aliases": [
        "CVE-2017-7572"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/bit-team/backintime",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "last_affected": "3996f979cae95d3f8d759c2e52295594a231a0c0"
                },
                {
                  "fixed": "7f208dc547f569b689c888103e3b593a48cd1869"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "cpe": "cpe:2.3:a:backintime_project:backintime:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "last_affected": "1.1.18"
                      }
                    ],
                    "source": "CPE_RANGE"
                  },
                  {
                    "range": [
                      {
                        "fixed": "7f208dc547f569b689c888103e3b593a48cd1869"
                      }
                    ],
                    "source": "REFERENCES_COMMIT"
                  }
                ]
              }
            }
          ],
          "versions": [
            "v1.1.18",
            "v1.1.16",
            "v1.1.14",
            "v1.1.12",
            "v1.1.10",
            "v1.1.8",
            "v1.1.6",
            "v1.1.4",
            "v1.1.2",
            "v1.1.0",
            "v1.0.28",
            "v1.0.24",
            "v1.0.20",
            "v1.0.18",
            "v1.0.14",
            "v1.0.12",
            "v1.0.6",
            "v1.0.4",
            "v1.0.2",
            "v1.0.0",
            "v0.9.26",
            "v0.9.24",
            "v0.9.22",
            "v0.9.20",
            "v0.9.18",
            "v0.9.16",
            "v0.9.14",
            "v0.9.12",
            "v0.9.10",
            "v0.9.8",
            "v0.9.6",
            "v0.9.4",
            "v0.9.2",
            "v0.9.0",
            "v0.8.20",
            "v0.8.18",
            "v0.8.16",
            "v0.8.14",
            "v0.8.12",
            "v0.8.8",
            "v0.8.0",
            "v0.7.4"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2017-7572.json"
          }
        }
      ],
      "modified": "2026-10-20T10:50:09.686035217Z",
      "provider": "osv",
      "references": [
        "https://github.com/bit-team/backintime/commit/7f208dc547f569b689c888103e3b593a48cd1869"
      ],
      "provider_metadata": {}
    },
    "related_cves": [
      {
        "value": "CVE-2017-7572",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 381364,
  "published_at": "2017-04-06T18:59:00.353+00:00"
}