USN-5142-1

Source
https://ubuntu.com/security/notices/USN-5142-1
Import Source
https://github.com/canonical/ubuntu-security-notices/blob/main/osv/USN-5142-1.json
Related
Published
2021-11-11T13:02:13.069161Z
Modified
2021-11-11T13:02:13.069161Z
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 correctly sandbox Kerberos tickets issues by an RODC. An RODC could print administrator tickets, contrary to expectations. (CVE-2020-25718)

Andrew Bartlett discovered that Samba incorrectly handled Kerberos tickets. Delegated administrators could possibly use this issue to impersonate accounts, leading to total domain compromise. (CVE-2020-25719)

Andrew Bartlett discovered that Samba did not provide stable AD identifiers to Kerberos acceptors. (CVE-2020-25721)

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)

Stefan Metzmacher discovered that Samba incorrectly handled certain large DCE/RPC requests. A remote attacker could possibly use this issue to bypass signature requirements. (CVE-2021-23192)

William Ross discovered that Samba incorrectly handled memory. A remote attacker could use this issue to cause Samba to crash, resulting in a denial of service, or possibly escalate privileges. (CVE-2021-3738)

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:20.04:LTS / samba

Package

Name
samba

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0The exact introduced commit is unknown
Fixed
2:4.13.14+dfsg-0ubuntu0.20.04.1

Ecosystem specific 

{
    "availability": "No subscription needed",
    "binaries": [
        {
            "libwbclient-dev": "2:4.13.14+dfsg-0ubuntu0.20.04.1",
            "samba-libs": "2:4.13.14+dfsg-0ubuntu0.20.04.1",
            "registry-tools": "2:4.13.14+dfsg-0ubuntu0.20.04.1",
            "samba-common-bin": "2:4.13.14+dfsg-0ubuntu0.20.04.1",
            "python3-samba": "2:4.13.14+dfsg-0ubuntu0.20.04.1",
            "samba-dsdb-modules": "2:4.13.14+dfsg-0ubuntu0.20.04.1",
            "ctdb": "2:4.13.14+dfsg-0ubuntu0.20.04.1",
            "libnss-winbind": "2:4.13.14+dfsg-0ubuntu0.20.04.1",
            "samba-vfs-modules": "2:4.13.14+dfsg-0ubuntu0.20.04.1",
            "winbind": "2:4.13.14+dfsg-0ubuntu0.20.04.1",
            "samba-common": "2:4.13.14+dfsg-0ubuntu0.20.04.1",
            "libpam-winbind": "2:4.13.14+dfsg-0ubuntu0.20.04.1",
            "smbclient": "2:4.13.14+dfsg-0ubuntu0.20.04.1",
            "samba-testsuite": "2:4.13.14+dfsg-0ubuntu0.20.04.1",
            "samba-dev": "2:4.13.14+dfsg-0ubuntu0.20.04.1",
            "libsmbclient": "2:4.13.14+dfsg-0ubuntu0.20.04.1",
            "samba": "2:4.13.14+dfsg-0ubuntu0.20.04.1",
            "libwbclient0": "2:4.13.14+dfsg-0ubuntu0.20.04.1",
            "libsmbclient-dev": "2:4.13.14+dfsg-0ubuntu0.20.04.1"
        }
    ]
}