SUSE yast2-auth-client up to 5.0.4 Active Directory Configuration src/lib/auth/authconf.rb Auth::AuthConf ou/dnshostname/username/domain os command injection

Summaryinfo

A vulnerability labeled as very critical has been found in SUSE yast2-auth-client up to 5.0.4. The affected element is the function Auth::AuthConf of the file src/lib/auth/authconf.rb of the component Active Directory Configuration. Such manipulation of the argument ou/dnshostname/username/domain leads to os command injection. This vulnerability is listed as CVE-2026-59681. The attack may be performed from remote. There is no available exploit.

Detailsinfo

A vulnerability, which was classified as very critical, has been found in SUSE yast2-auth-client up to 5.0.4. Affected by this issue is the function Auth::AuthConf of the file src/lib/auth/authconf.rb of the component Active Directory Configuration. The manipulation of the argument ou/dnshostname/username/domain with an unknown input leads to a os command injection vulnerability. Using CWE to declare the problem leads to CWE-78. The product constructs all or part of an OS command using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the intended OS command when it is sent to a downstream component. Impacted is confidentiality, integrity, and availability. CVE summarizes:

A OS command injection vulnerability in yast2-auth-client allows an attacker who controls Active Directory configuration values to execute arbitrary commands as root on the configured host. Auth::AuthConf in src/lib/auth/authconf.rb assembles the Samba net ads join, net ads lookup -S and net ads testjoin invocations by interpolating configuration values into a single command string and passing that string to Open3.popen2 / Open3.capture2, which causes Ruby to run it through /bin/sh. The Organizational Unit (ou), dnshostname, AD user name and AD domain name values are neither validated nor shell-quoted.

The advisory is shared for download at bugzilla.suse.com. This vulnerability is handled as CVE-2026-59681 since 07/06/2026. The exploitation is known to be easy. The attack may be launched remotely. Additional levels of successful authentication are necessary for exploitation. There are known technical details, but no exploit is available. The current price for an exploit might be approx. USD $5k-$25k (estimation calculated on 09/01/2026). The MITRE ATT&CK project declares the attack technique as T1202.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

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Productinfo

Vendor

• SUSE

Name

• yast2-auth-client

Version

• 5.0.0
• 5.0.1
• 5.0.2
• 5.0.3
• 5.0.4

License

• open-source

Website

• Vendor: https://www.suse.com/

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