critical
9
CWE
362 287
Advisory Published
CVE Published
Updated

CVE-2020-25719: Race Condition

First published: Wed Nov 03 2021(Updated: )

A flaw was found in the way Samba, as an Active Directory Domain Controller, implemented Kerberos name-based authentication. The Samba AD DC, could become confused about the user a ticket represents if it did not strictly require a Kerberos PAC and always use the SIDs found within. The result could include total domain compromise.

Credit: secalert@redhat.com secalert@redhat.com secalert@redhat.com

Affected SoftwareAffected VersionHow to fix
redhat/samba<4.15.2
4.15.2
redhat/samba<4.14.10
4.14.10
redhat/samba<4.13.14
4.13.14
debian/samba
2:4.13.13+dfsg-1~deb11u6
2:4.17.12+dfsg-0+deb12u1
2:4.21.1+dfsg-2
Samba>=4.0.0<4.13.14
Samba>=4.14.0<4.14.10
Samba>=4.15.0<4.15.2
Debian GNU/Linux=9.0
Debian GNU/Linux=10.0
Fedoraproject Fedora=33
Fedoraproject Fedora=34
Fedoraproject Fedora=35
Ubuntu Linux=20.04
Ubuntu Linux=21.04
Ubuntu Linux=21.10
Red Hat Enterprise Linux=7.0
Red Hat Enterprise Linux=8.0
redhat enterprise Linux desktop=7.0
redhat enterprise Linux eus=8.2
redhat enterprise Linux eus=8.4
redhat enterprise Linux for ibm z systems=7.0
redhat enterprise Linux for ibm z systems=8.0
redhat enterprise Linux for ibm z systems eus=8.2
redhat enterprise Linux for ibm z systems eus=8.4
redhat enterprise Linux for power big endian=7.0
redhat enterprise Linux for power little endian=7.0
redhat enterprise Linux for power little endian=8.0
redhat enterprise Linux for power little endian eus=8.2
redhat enterprise Linux for power little endian eus=8.4
redhat enterprise Linux for scientific computing=7.0
redhat enterprise Linux server aus=8.2
redhat enterprise Linux server aus=8.4
redhat enterprise Linux server tus=8.2
redhat enterprise Linux server tus=8.4
redhat enterprise Linux server update services for sap solutions=8.2
redhat enterprise Linux server update services for sap solutions=8.4
redhat enterprise Linux workstation=7.0
Debian=9.0
Debian=10.0
Fedora=33
Fedora=34
Fedora=35
Ubuntu=20.04
Ubuntu=21.04
Ubuntu=21.10

Remedy

https://bugzilla.redhat.com/show_bug.cgi?id=2019732

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Reference Links

Frequently Asked Questions

  • What is CVE-2020-25719?

    CVE-2020-25719 is a vulnerability in Samba that affects the way it implements Kerberos name-based authentication.

  • How does CVE-2020-25719 impact Samba?

    CVE-2020-25719 could cause the Samba AD DC to become confused about the user a ticket represents if it does not strictly require a Kerberos PAC.

  • What is the severity of CVE-2020-25719?

    The severity of CVE-2020-25719 is critical, with a severity value of 7.2.

  • Which versions of Samba are affected by CVE-2020-25719?

    CVE-2020-25719 affects Samba versions 4.0.0 to 4.13.14, 4.14.0 to 4.14.10, and 4.15.0 to 4.15.2.

  • How can I fix CVE-2020-25719 in Samba?

    To fix CVE-2020-25719 in Samba, update to version 4.13.14, 4.14.10, or 4.15.2.

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