USN-5174-2

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Source
https://ubuntu.com/security/notices/USN-5174-2
Import Source
https://github.com/canonical/ubuntu-security-notices/blob/main/osv/USN-5174-2.json
JSON Data
https://api.osv.dev/v1/vulns/USN-5174-2
Published
2021-12-13T19:55:15.490247Z
Modified
2021-12-13T19:55:15.490247Z
Summary
samba regression
Details

USN-5174-1 fixed vulnerabilities in Samba. Some of the changes introduced a regression in Kerberos authentication in certain environments.

Please see the following upstream bug for more information: https://bugzilla.samba.org/show_bug.cgi?id=14922

This update fixes the problem.

Original advisory details:

Stefan Metzmacher discovered that Samba incorrectly handled SMB1 client connections. A remote attacker could possibly use this issue to downgrade connections to plaintext authentication. (CVE-2016-2124)

Andrew Bartlett discovered that Samba incorrectly mapping domain users to local users. An authenticated attacker could possibly use this issue to become root on domain members. (CVE-2020-25717)

Andrew Bartlett discovered that Samba did not properly check sensitive attributes. An authenticated attacker could possibly use this issue to escalate privileges. (CVE-2020-25722)

Joseph Sutton discovered that Samba incorrectly handled certain TGS requests. An authenticated attacker could possibly use this issue to cause Samba to crash, resulting in a denial of service. (CVE-2021-3671)

The fix for CVE-2020-25717 results in possible behaviour changes that could affect certain environments. Please see the upstream advisory for more information:

https://www.samba.org/samba/security/CVE-2020-25717.html

References

Affected packages

Ubuntu:18.04:LTS / samba

Package

Name
samba

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
2:4.7.6+dfsg~ubuntu-0ubuntu2.27

Ecosystem specific

{
    "availability": "No subscription needed",
    "binaries": [
        {
            "libwbclient-dev": "2:4.7.6+dfsg~ubuntu-0ubuntu2.27",
            "python-samba": "2:4.7.6+dfsg~ubuntu-0ubuntu2.27",
            "samba-dsdb-modules": "2:4.7.6+dfsg~ubuntu-0ubuntu2.27",
            "samba-common-bin": "2:4.7.6+dfsg~ubuntu-0ubuntu2.27",
            "registry-tools": "2:4.7.6+dfsg~ubuntu-0ubuntu2.27",
            "samba-libs": "2:4.7.6+dfsg~ubuntu-0ubuntu2.27",
            "ctdb": "2:4.7.6+dfsg~ubuntu-0ubuntu2.27",
            "libnss-winbind": "2:4.7.6+dfsg~ubuntu-0ubuntu2.27",
            "samba-vfs-modules": "2:4.7.6+dfsg~ubuntu-0ubuntu2.27",
            "winbind": "2:4.7.6+dfsg~ubuntu-0ubuntu2.27",
            "samba-common": "2:4.7.6+dfsg~ubuntu-0ubuntu2.27",
            "libpam-winbind": "2:4.7.6+dfsg~ubuntu-0ubuntu2.27",
            "smbclient": "2:4.7.6+dfsg~ubuntu-0ubuntu2.27",
            "samba-testsuite": "2:4.7.6+dfsg~ubuntu-0ubuntu2.27",
            "samba-dev": "2:4.7.6+dfsg~ubuntu-0ubuntu2.27",
            "libparse-pidl-perl": "2:4.7.6+dfsg~ubuntu-0ubuntu2.27",
            "libsmbclient": "2:4.7.6+dfsg~ubuntu-0ubuntu2.27",
            "libwbclient0": "2:4.7.6+dfsg~ubuntu-0ubuntu2.27",
            "samba": "2:4.7.6+dfsg~ubuntu-0ubuntu2.27",
            "libsmbclient-dev": "2:4.7.6+dfsg~ubuntu-0ubuntu2.27"
        }
    ]
}