7.5 High
CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
7.6 High
AI Score
Confidence
High
5 Medium
CVSS2
Access Vector
NETWORK
Access Complexity
LOW
Authentication
NONE
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
PARTIAL
AV:N/AC:L/Au:N/C:N/I:N/A:P
0.005 Low
EPSS
Percentile
76.5%
Issue Overview:
A flaw was found in krb5. MIT Kerberos 5 allows unbounded recursion via an ASN.1-encoded Kerberos message because the lib/krb5/asn.1/asn1_encode.c support for BER indefinite lengths lacks a recursion limit. (CVE-2020-28196)
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.amzn2.2.3.aarch64
krb5-libs-1.15.1-37.amzn2.2.3.aarch64
krb5-server-1.15.1-37.amzn2.2.3.aarch64
krb5-server-ldap-1.15.1-37.amzn2.2.3.aarch64
krb5-workstation-1.15.1-37.amzn2.2.3.aarch64
krb5-pkinit-1.15.1-37.amzn2.2.3.aarch64
libkadm5-1.15.1-37.amzn2.2.3.aarch64
krb5-debuginfo-1.15.1-37.amzn2.2.3.aarch64
i686:
krb5-devel-1.15.1-37.amzn2.2.3.i686
krb5-libs-1.15.1-37.amzn2.2.3.i686
krb5-server-1.15.1-37.amzn2.2.3.i686
krb5-server-ldap-1.15.1-37.amzn2.2.3.i686
krb5-workstation-1.15.1-37.amzn2.2.3.i686
krb5-pkinit-1.15.1-37.amzn2.2.3.i686
libkadm5-1.15.1-37.amzn2.2.3.i686
krb5-debuginfo-1.15.1-37.amzn2.2.3.i686
src:
krb5-1.15.1-37.amzn2.2.3.src
x86_64:
krb5-devel-1.15.1-37.amzn2.2.3.x86_64
krb5-libs-1.15.1-37.amzn2.2.3.x86_64
krb5-server-1.15.1-37.amzn2.2.3.x86_64
krb5-server-ldap-1.15.1-37.amzn2.2.3.x86_64
krb5-workstation-1.15.1-37.amzn2.2.3.x86_64
krb5-pkinit-1.15.1-37.amzn2.2.3.x86_64
libkadm5-1.15.1-37.amzn2.2.3.x86_64
krb5-debuginfo-1.15.1-37.amzn2.2.3.x86_64
Red Hat: CVE-2020-28196
Mitre: CVE-2020-28196
OS | Version | Architecture | Package | Version | Filename |
---|---|---|---|---|---|
Amazon Linux | 2 | aarch64 | krb5-devel | < 1.15.1-37.amzn2.2.3 | krb5-devel-1.15.1-37.amzn2.2.3.aarch64.rpm |
Amazon Linux | 2 | aarch64 | krb5-libs | < 1.15.1-37.amzn2.2.3 | krb5-libs-1.15.1-37.amzn2.2.3.aarch64.rpm |
Amazon Linux | 2 | aarch64 | krb5-server | < 1.15.1-37.amzn2.2.3 | krb5-server-1.15.1-37.amzn2.2.3.aarch64.rpm |
Amazon Linux | 2 | aarch64 | krb5-server-ldap | < 1.15.1-37.amzn2.2.3 | krb5-server-ldap-1.15.1-37.amzn2.2.3.aarch64.rpm |
Amazon Linux | 2 | aarch64 | krb5-workstation | < 1.15.1-37.amzn2.2.3 | krb5-workstation-1.15.1-37.amzn2.2.3.aarch64.rpm |
Amazon Linux | 2 | aarch64 | krb5-pkinit | < 1.15.1-37.amzn2.2.3 | krb5-pkinit-1.15.1-37.amzn2.2.3.aarch64.rpm |
Amazon Linux | 2 | aarch64 | libkadm5 | < 1.15.1-37.amzn2.2.3 | libkadm5-1.15.1-37.amzn2.2.3.aarch64.rpm |
Amazon Linux | 2 | aarch64 | krb5-debuginfo | < 1.15.1-37.amzn2.2.3 | krb5-debuginfo-1.15.1-37.amzn2.2.3.aarch64.rpm |
Amazon Linux | 2 | i686 | krb5-devel | < 1.15.1-37.amzn2.2.3 | krb5-devel-1.15.1-37.amzn2.2.3.i686.rpm |
Amazon Linux | 2 | i686 | krb5-libs | < 1.15.1-37.amzn2.2.3 | krb5-libs-1.15.1-37.amzn2.2.3.i686.rpm |
7.5 High
CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
7.6 High
AI Score
Confidence
High
5 Medium
CVSS2
Access Vector
NETWORK
Access Complexity
LOW
Authentication
NONE
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
PARTIAL
AV:N/AC:L/Au:N/C:N/I:N/A:P
0.005 Low
EPSS
Percentile
76.5%