CVE-2026-12249Critical· 9.0▾ MidnightCanonical ADSys Uses a Less Trusted Source
▾ Midnight zone — Critical, or high with PoC / in-the-wild
impact 49.5 · likelihood 0 · exploitation 0
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Exploit-prediction probability, daily snapshots since Sep 21.
Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via OSV
0.1%
Last analysed / modified upstream
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.
github.com/ubuntu/adsys < 0.16.3-0.20250318112551-8b1939f96d38Upgrade to a patched release:
github.com/ubuntu/adsys 0.16.3-0.20250318112551-8b1939f96d38Connected by shared product, vendor, weakness, or advisory.
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