Froxlor before 2.3.12 Privilege Escalation via SSH Key Sync

{
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "cveMetadata": {
    "cveId": "CVE-2026-100713",
    "assignerOrgId": "83251b91-4cc7-4094-a5c7-464a1b83ea10",
    "assignerShortName": "VulnCheck",
    "dateUpdated": "2026-09-26T23:10:14.884Z",
    "dateReserved": "2026-09-26T02:40:23.373Z",
    "datePublished": "2026-09-26T13:24:05.746Z",
    "state": "PUBLISHED"
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        "shortName": "VulnCheck",
        "dateUpdated": "2026-09-26T13:24:05.746Z"
      },
      "datePublic": "2026-09-06T00:00:00.000Z",
      "title": "Froxlor before 2.3.12 Privilege Escalation via SSH Key Sync",
      "descriptions": [
        {
          "lang": "en",
          "value": "Froxlor 2.3.10 and earlier contain a time-of-check time-of-use (TOCTOU) race condition in the SSH key synchronization cron (lib/Froxlor/Cron/System/SshKeys.php, SshKeys::generateFiles). The containment/symlink validation performed by FileDir::makeCorrectDir()/makeCorrectFile() is done only at check time; the live filesystem path is re-resolved as root at write time (file_put_contents with FILE_APPEND|LOCK_EX, followed by chmod/chown/chgrp), with a database round-trip and file reads in between, and no path or file-descriptor pinning (no O_NOFOLLOW or openat2(RESOLVE_NO_SYMLINKS)). On installations where the non-default setting system.allow_customer_shell=1 grants customers local shell access, a customer can atomically swap their ~/.ssh directory for a symlink after the check and before the write, causing the root-run cron to append the customer's public key to /root/.ssh/authorized_keys and to chown /root/.ssh to the customer, resulting in full root compromise of the panel host. The cron re-runs on every interval, allowing unlimited attempts. This is a residual race that bypasses the check-time fix introduced for GHSA-mq5v-... . The issue is fixed in Froxlor 2.3.12."
        }
      ],
      "affected": [
        {
          "vendor": "froxlor",
          "product": "froxlor",
          "defaultStatus": "unaffected",
          "versions": [
            {
              "version": "0",
              "status": "affected",
              "versionType": "semver",
              "lessThan": "2.3.12"
            },
            {
              "version": "2.3.12",
              "status": "unaffected",
              "versionType": "semver"
            }
          ]
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "lang": "en",
              "description": "Time-of-check Time-of-use (TOCTOU) Race Condition",
              "cweId": "CWE-367",
              "type": "CWE"
            }
          ]
        }
      ],
      "references": [
        {
          "url": "https://github.com/froxlor/froxlor/security/advisories/GHSA-927x-9jfh-mq42",
          "name": "GitHub Security Advisory (GHSA-927x-9jfh-mq42)",
          "tags": [
            "vendor-advisory"
          ]
        },
        {
          "url": "https://www.vulncheck.com/advisories/froxlor-before-2.3.12-privilege-escalation-via-ssh-key-sync",
          "name": "VulnCheck Advisory: Froxlor before 2.3.12 Privilege Escalation via SSH Key Sync",
          "tags": [
            "third-party-advisory"
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        }
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          "format": "CVSS"
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          "format": "CVSS",
          "cvssV3_1": {
            "version": "3.1",
            "vectorString": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H",
            "attackVector": "LOCAL",
            "attackComplexity": "HIGH",
            "privilegesRequired": "LOW",
            "userInteraction": "NONE",
            "scope": "CHANGED",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "HIGH",
            "availabilityImpact": "HIGH",
            "baseScore": 7.8,
            "baseSeverity": "HIGH"
          }
        }
      ],
      "credits": [
        {
          "lang": "en",
          "value": "skeletonsec",
          "type": "reporter"
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      ]
    },
    "adp": [
      {
        "providerMetadata": {
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP",
          "dateUpdated": "2026-09-26T23:10:14.884Z"
        },
        "title": "CISA ADP Vulnrichment",
        "metrics": [
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}