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CVE-2026-4408

Samba: remote code execution in samr PUBLISHED

Description (CNA)

A flaw was found in Samba. A remote attacker can exploit a misconfiguration in Samba file servers and classic domain controllers that use the "check password script" feature. If this script is configured with the %u substitution character, the client-controlled username is passed without proper escaping of shell meta-characters. This vulnerability allows an attacker to achieve remote command execution on the affected system. This issue primarily affects non-standard configurations where the "check password script" is used with %u and the samba-dcerpcd service is started as a system service.

Affected (CNA)

Vendor / productVersions
Red Hat / Red Hat Enterprise Linux 10unaffected 0:4.23.5-109.el10_2 before *
Red Hat / Red Hat Enterprise Linux 10.0 Extended Update Supportunaffected 0:4.21.3-114.el10_0.1 before *
Red Hat / Red Hat Enterprise Linux 7 Extended Lifecycle Supportunaffected 0:4.10.16-26.el7_9.1 before *
Red Hat / Red Hat Enterprise Linux 7 Extended Lifecycle Supportunaffected 0:4.10.16-26.el7_9.1 before *
Red Hat / Red Hat Enterprise Linux 8unaffected 0:4.19.4-16.el8_10 before *
Red Hat / Red Hat Enterprise Linux 8unaffected 0:4.19.4-16.el8_10 before *
Red Hat / Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Supportunaffected 0:4.13.3-12.el8_4.1 before *
Red Hat / Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-Onunaffected 0:4.13.3-12.el8_4.1 before *
Red Hat / Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Supportunaffected 0:4.15.5-16.el8_6.1 before *
Red Hat / Red Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-Onunaffected 0:4.15.5-16.el8_6.1 before *
Red Hat / Red Hat Enterprise Linux 8.8 Telecommunications Update Serviceunaffected 0:4.17.5-7.el8_8.1 before *
Red Hat / Red Hat Enterprise Linux 8.8 Update Services for SAP Solutionsunaffected 0:4.17.5-7.el8_8.1 before *
Red Hat / Red Hat Enterprise Linux 9unaffected 0:4.23.5-10.el9_8 before *
Red Hat / Red Hat Enterprise Linux 9unaffected 0:4.23.5-10.el9_8 before *
Red Hat / Red Hat Enterprise Linux 9.2 Update Services for SAP Solutionsunaffected 0:4.17.5-105.el9_2.5 before *
Red Hat / Red Hat Enterprise Linux 9.4 Update Services for SAP Solutionsunaffected 0:4.19.4-105.el9_4.4 before *
Red Hat / Red Hat Enterprise Linux 9.6 Extended Update Supportunaffected 0:4.21.3-14.el9_6.1 before *
Red Hat / Red Hat OpenShift Container Platform 4.12unaffected 412.86.202608241157-0 before *
Red Hat / Red Hat OpenShift Container Platform 4.13unaffected 413.92.202609080414-0 before *
Red Hat / Red Hat OpenShift Container Platform 4.14unaffected 414.92.202608172040-0 before *
Red Hat / Red Hat OpenShift Container Platform 4.15unaffected 415.92.202608180329-0 before *
Red Hat / Red Hat OpenShift Container Platform 4.16unaffected 416.94.202608150307-0 before *
Red Hat / Red Hat OpenShift Container Platform 4.17unaffected 417.94.202608250221-0 before *
Red Hat / Red Hat OpenShift Container Platform 4.18unaffected 418.94.202608142238-0 before *
Red Hat / Red Hat OpenShift Container Platform 4.19unaffected 4.19.9.6.202606241344-0 before *
Red Hat / Red Hat OpenShift Container Platform 4.20unaffected 4.20.9.6.202606241928-0 before *
Red Hat / Red Hat OpenShift Container Platform 4.21unaffected 4.21.9.6.202606241859-0 before *
Red Hat / Red Hat Enterprise Linux 6unknown
Red Hat / Red Hat Enterprise Linux 6unknown

CWE

CWE-78

References

ADP enrichment

CISA-ADP

No English description supplied.

No references supplied.

redhat-SADP

A flaw was found in Samba. A remote attacker can exploit a misconfiguration in Samba file servers and classic domain controllers that use the "check password script" feature. If this script is configured with the %u substitution character, the client-controlled username is passed without proper escaping of shell meta-characters. This vulnerability allows an attacker to achieve remote command execution on the affected system. This issue primarily affects non-standard configurations where the "check password script" is used with %u and the samba-dcerpcd service is started as a system service.