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
Samba Samba>=4.0.0<4.13.14
Samba Samba>=4.14.0<4.14.10
Samba Samba>=4.15.0<4.15.2
Debian Debian Linux=9.0
Debian Debian Linux=10.0
Fedoraproject Fedora=33
Fedoraproject Fedora=34
Fedoraproject Fedora=35
Canonical Ubuntu Linux=20.04
Canonical Ubuntu Linux=21.04
Canonical Ubuntu Linux=21.10
Redhat Enterprise Linux=7.0
Redhat 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
redhat/samba<4.15.2
4.15.2
redhat/samba<4.14.10
4.14.10
redhat/samba<4.13.14
4.13.14
ubuntu/samba<2:4.13.14+dfsg-0ubuntu0.20.04.1
2:4.13.14+dfsg-0ubuntu0.20.04.1
ubuntu/samba<2:4.13.14+dfsg-0ubuntu0.21.04.1
2:4.13.14+dfsg-0ubuntu0.21.04.1
ubuntu/samba<2:4.13.14+dfsg-0ubuntu0.21.10.1
2:4.13.14+dfsg-0ubuntu0.21.10.1
ubuntu/samba<2:4.13.14+dfsg-0ubuntu1
2:4.13.14+dfsg-0ubuntu1
ubuntu/samba<2:4.13.14+dfsg-0ubuntu1
2:4.13.14+dfsg-0ubuntu1
ubuntu/samba<2:4.13.14+dfsg-0ubuntu1
2:4.13.14+dfsg-0ubuntu1
ubuntu/samba<4.13.14
4.13.14
debian/samba<=2:4.9.5+dfsg-5+deb10u3<=2:4.9.5+dfsg-5+deb10u5
2:4.13.13+dfsg-1~deb11u5
2:4.13.13+dfsg-1~deb11u6
2:4.17.12+dfsg-0+deb12u1
2:4.19.5+dfsg-1
2:4.19.6+dfsg-1

Remedy

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

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Reference Links

Parent vulnerabilities

(Appears in the following advisories)

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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