Detections
Analytics

SCA: security update for github.com/ubuntu/adsys (GHSA-crm4-q7v4-c2r2)

critical Tenable Cloud Security Plugin ID 448377

Description

There are packages installed that are affected by a vulnerability referenced in the following CVE:

 - 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.
 (CVE-2026-12249)

Solution

Update the github.com/ubuntu/adsys library and its related packages to version 0.16.3-0.20250318112551-8b1939f96d38 or later.

See Also

https://github.com/advisories/GHSA-crm4-q7v4-c2r2

Plugin Details

Severity: Critical

ID: 448377

Version: Revision 1.1

Type: Local

Family: SCA Checks

Published: 9/25/2026

Updated: 9/25/2026

Risk Information

VPR

Risk Factor: Medium

Score: 5

Percentile: 94.23

Vendor

Vendor Severity: Critical

CVSS v2

Risk Factor: High

Base Score: 7.6

Temporal Score: 5.6

Vector: CVSS2#AV:N/AC:H/Au:N/C:C/I:C/A:C

CVSS Score Source: CVE-2026-12249

CVSS v3

Risk Factor: Critical

Base Score: 9

Temporal Score: 7.8

Vector: CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H

Temporal Vector: CVSS:3.0/E:U/RL:O/RC:C

CVSS v4

Risk Factor: Critical

Base Score: 9.5

Threat Score: 8.4

Threat Vector: CVSS:4.0/E:U

Vector: CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H

Vulnerability Information

Exploit Ease: No known exploits are available

Patch Publication Date: 6/22/2026

Vulnerability Publication Date: 6/22/2026

Reference Information

CVE: CVE-2026-12249

cwe: CWE-348