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Debian: Security Advisory for samba (DSA-5015-1)

Information

Severity

Severity

Medium

Family

Family

Debian Local Security Checks

CVSSv2 Base

CVSSv2 Base

5.0

CVSSv2 Vector

CVSSv2 Vector

AV:N/AC:L/Au:N/C:P/I:N/A:N

Solution Type

Solution Type

Vendor Patch

Created

Created

1 year ago

Modified

Modified

1 year ago

Summary

The remote host is missing an update for the 'samba' package(s) announced via the DSA-5015-1 advisory.

Insight

Insight

Andrew Bartlett discovered that Samba, a SMB/CIFS file, print, and login server for Unix, may map domain users to local users in an undesired way. This could allow a user in an AD domain to potentially become root on domain members. A new parameter min domain uid (default 1000) has been added to specify the minimum uid allowed when mapping a local account to a domain account. Further details and workarounds can be found in the upstream advisory [link moved to references]

Affected Software

Affected Software

'samba' package(s) on Debian Linux.

Detection Method

Detection Method

Checks if a vulnerable package version is present on the target host.

Solution

Solution

For the oldstable distribution (buster), this problem has been fixed in version 2:4.9.5+dfsg-5+deb10u2. Additionally the update mitigates CVE-2020-25722. Unfortunately the changes required to fix additional CVEs affecting Samba as an AD-compatible domain controller are too invasive to be backported. Thus users using Samba as an AD-compatible domain controller are encouraged to migrate to Debian bullseye. From this point onwards AD domain controller setups are no longer supported in Debian oldstable. We recommend that you upgrade your samba packages.

Common Vulnerabilities and Exposures (CVE)