CVSS2
Attack Vector
NETWORK
Attack Complexity
LOW
Authentication
SINGLE
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
PARTIAL
AV:N/AC:L/Au:S/C:N/I:N/A:P
CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
HIGH
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
AI Score
Confidence
High
EPSS
Percentile
73.3%
Issue Overview:
A flaw was found in krb5. The Key Distribution Center (KDC) in MIT Kerberos 5 has a NULL pointer dereference via a FAST inner body that lacks a server field. An authenticated attacker could use this flaw to crash the Kerberos KDC server. The highest threat from this vulnerability is to system availability. (CVE-2021-37750)
Affected Packages:
krb5
Note:
This advisory is applicable to Amazon Linux 2 (AL2) Core repository. Visit this FAQ section for the difference between AL2 Core and AL2 Extras advisories.
Issue Correction:
Run yum update krb5 to update your system.
New Packages:
aarch64:
krb5-devel-1.15.1-37.amzn2.2.4.aarch64
krb5-libs-1.15.1-37.amzn2.2.4.aarch64
krb5-server-1.15.1-37.amzn2.2.4.aarch64
krb5-server-ldap-1.15.1-37.amzn2.2.4.aarch64
krb5-workstation-1.15.1-37.amzn2.2.4.aarch64
krb5-pkinit-1.15.1-37.amzn2.2.4.aarch64
libkadm5-1.15.1-37.amzn2.2.4.aarch64
krb5-debuginfo-1.15.1-37.amzn2.2.4.aarch64
i686:
krb5-devel-1.15.1-37.amzn2.2.4.i686
krb5-libs-1.15.1-37.amzn2.2.4.i686
krb5-server-1.15.1-37.amzn2.2.4.i686
krb5-server-ldap-1.15.1-37.amzn2.2.4.i686
krb5-workstation-1.15.1-37.amzn2.2.4.i686
krb5-pkinit-1.15.1-37.amzn2.2.4.i686
libkadm5-1.15.1-37.amzn2.2.4.i686
krb5-debuginfo-1.15.1-37.amzn2.2.4.i686
src:
krb5-1.15.1-37.amzn2.2.4.src
x86_64:
krb5-devel-1.15.1-37.amzn2.2.4.x86_64
krb5-libs-1.15.1-37.amzn2.2.4.x86_64
krb5-server-1.15.1-37.amzn2.2.4.x86_64
krb5-server-ldap-1.15.1-37.amzn2.2.4.x86_64
krb5-workstation-1.15.1-37.amzn2.2.4.x86_64
krb5-pkinit-1.15.1-37.amzn2.2.4.x86_64
libkadm5-1.15.1-37.amzn2.2.4.x86_64
krb5-debuginfo-1.15.1-37.amzn2.2.4.x86_64
Red Hat: CVE-2021-37750
Mitre: CVE-2021-37750
OS | Version | Architecture | Package | Version | Filename |
---|---|---|---|---|---|
Amazon Linux | 2 | aarch64 | krb5-devel | < 1.15.1-37.amzn2.2.4 | krb5-devel-1.15.1-37.amzn2.2.4.aarch64.rpm |
Amazon Linux | 2 | aarch64 | krb5-libs | < 1.15.1-37.amzn2.2.4 | krb5-libs-1.15.1-37.amzn2.2.4.aarch64.rpm |
Amazon Linux | 2 | aarch64 | krb5-server | < 1.15.1-37.amzn2.2.4 | krb5-server-1.15.1-37.amzn2.2.4.aarch64.rpm |
Amazon Linux | 2 | aarch64 | krb5-server-ldap | < 1.15.1-37.amzn2.2.4 | krb5-server-ldap-1.15.1-37.amzn2.2.4.aarch64.rpm |
Amazon Linux | 2 | aarch64 | krb5-workstation | < 1.15.1-37.amzn2.2.4 | krb5-workstation-1.15.1-37.amzn2.2.4.aarch64.rpm |
Amazon Linux | 2 | aarch64 | krb5-pkinit | < 1.15.1-37.amzn2.2.4 | krb5-pkinit-1.15.1-37.amzn2.2.4.aarch64.rpm |
Amazon Linux | 2 | aarch64 | libkadm5 | < 1.15.1-37.amzn2.2.4 | libkadm5-1.15.1-37.amzn2.2.4.aarch64.rpm |
Amazon Linux | 2 | aarch64 | krb5-debuginfo | < 1.15.1-37.amzn2.2.4 | krb5-debuginfo-1.15.1-37.amzn2.2.4.aarch64.rpm |
Amazon Linux | 2 | i686 | krb5-devel | < 1.15.1-37.amzn2.2.4 | krb5-devel-1.15.1-37.amzn2.2.4.i686.rpm |
Amazon Linux | 2 | i686 | krb5-libs | < 1.15.1-37.amzn2.2.4 | krb5-libs-1.15.1-37.amzn2.2.4.i686.rpm |
CVSS2
Attack Vector
NETWORK
Attack Complexity
LOW
Authentication
SINGLE
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
PARTIAL
AV:N/AC:L/Au:S/C:N/I:N/A:P
CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
HIGH
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
AI Score
Confidence
High
EPSS
Percentile
73.3%