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CriticalFix available

Canonical ADSys Uses a Less Trusted Source

Type: advisorySource: OSV1 source record

An issue was discovered in Canonical ADSys upstream versions through v0.16.2. During Active Directory Certificate Services (AD CS) certificate auto-enrollment via the vendored Samba client script (internal/policies/certificate/python/vendor_samba/gp/gp_cert_auto_enroll_ext.py), ADSys utilizes a plaintext HTTP connection (http://) instead of a secure HTTPS connection (https://) to request the CA certificate from the Active Directory Certificate Services server (GetCACert). An unauthenticated network attacker positioned between the managed Ubuntu host and the configured AD CS CA hostname can conduct a Man-in-the-Middle (MITM) attack. By intercepting the plaintext HTTP request, the attacker can supply an arbitrary, attacker-controlled Root CA certificate. Because the system automatically accepts this certificate and registers it into the local system trust store via update-ca-certificates, this results in system-wide trust store poisoning. Consequently, TLS clients utilizing the operating system trust store on the affected machine will accept rogue certificates for arbitrary domains, enabling persistent decryption and interception of subsequent TLS connections. This issue is resolved in version v0.16.3.

Announced Source revision 1
Original source ↗

GHSA-crm4-q7v4-c2r2

Primary source · Revision 1

Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.

Security context

Source reference: osv:GHSA-crm4-q7v4-c2r2

github.com/ubuntu/adsys

Source reference: /affected/0/package/name

Affected versions
Not stated in this record
Fixed versions
0.16.3-0.20250318112551-8b1939f96d38

Source reference: /affected/0/ranges

Prerequisites
Not stated in this record

Structured affected-version data

Original package identities and version rules from this source.

[
  {
    "ranges": [
      {
        "type": "SEMVER",
        "events": [
          {
            "introduced": "0"
          },
          {
            "fixed": "0.16.3-0.20250318112551-8b1939f96d38"
          }
        ]
      }
    ],
    "package": {
      "name": "github.com/ubuntu/adsys",
      "purl": "pkg:golang/github.com/ubuntu/adsys",
      "ecosystem": "Go"
    },
    "database_specific": {
      "source": "https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/06/GHSA-crm4-q7v4-c2r2/GHSA-crm4-q7v4-c2r2.json"
    }
  }
]
Related CVEs
CVE-2026-12249

Source reference: /aliases

Publisher severity

critical

Source reference: /database_specific/severity

Event
#23405 · Revision 1
Added to Heist Feed
Publisher date
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