Canonical ADSys Trust Store Poisoning via Plaintext HTTP Certificate Auto-Enrollment
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.
Scoped product and version facts
Fix information unknown; no fixed version is derived here. Missing information does not prove that no fix exists.
Exploitation unknown; this catalogue does not assess exploitation.
adsys
Vendor
Unknown
Product
Unknown
Platforms
Unknown
Default status
unaffected
Package
adsys
Package collection
https://github.com/ubuntu
adsys · Scoped product and version facts
Version (version)
Status (status)
Version scheme (versionType)
Exclusive end (lessThan)
Inclusive end (lessThanOrEqual)
Status changes (at → status)
0.13.0
affected
semver
0.16.3
Unavailable
None listed
Ubuntu 20.04 LTS
Vendor
Canonical
Product
Ubuntu 20.04 LTS
Platforms
Linux
Default status
unaffected
Package
adsys
Package collection
https://launchpad.net/ubuntu/focal
Ubuntu 20.04 LTS · Scoped product and version facts
Version (version)
Status (status)
Version scheme (versionType)
Exclusive end (lessThan)
Inclusive end (lessThanOrEqual)
Status changes (at → status)
0.9.2~20.04.2ubuntu0.1+esm2
unaffected
dpkg
Unavailable
Unavailable
None listed
Ubuntu 22.04 LTS
Vendor
Canonical
Product
Ubuntu 22.04 LTS
Platforms
Linux
Default status
affected
Package
adsys
Package collection
https://launchpad.net/ubuntu/jammy
Ubuntu 22.04 LTS · Scoped product and version facts
Version (version)
Status (status)
Version scheme (versionType)
Exclusive end (lessThan)
Inclusive end (lessThanOrEqual)
Status changes (at → status)
0.16.3~22.04.2ubuntu0.22.04.1
unaffected
dpkg
Unavailable
Unavailable
None listed
Ubuntu 24.04 LTS
Vendor
Canonical
Product
Ubuntu 24.04 LTS
Platforms
Linux
Default status
affected
Package
adsys
Package collection
https://launchpad.net/ubuntu/noble
Ubuntu 24.04 LTS · Scoped product and version facts
Version (version)
Status (status)
Version scheme (versionType)
Exclusive end (lessThan)
Inclusive end (lessThanOrEqual)
Status changes (at → status)
0.16.3~24.04.2ubuntu0.24.04.1
unaffected
dpkg
Unavailable
Unavailable
None listed
Ubuntu 25.10
Vendor
Canonical
Product
Ubuntu 25.10
Platforms
Linux
Default status
unaffected
Package
adsys
Package collection
https://launchpad.net/ubuntu/questing
Ubuntu 25.10 · Scoped product and version facts
Version (version)
Status (status)
Version scheme (versionType)
Exclusive end (lessThan)
Inclusive end (lessThanOrEqual)
Status changes (at → status)
0.16.3
unaffected
dpkg
Unavailable
Unavailable
None listed
Ubuntu 26.04 LTS
Vendor
Canonical
Product
Ubuntu 26.04 LTS
Platforms
Linux
Default status
unaffected
Package
adsys
Package collection
https://launchpad.net/ubuntu/resolute
Ubuntu 26.04 LTS · Scoped product and version facts