CVE-2020-28196

krb5: unbounded recursion via an ASN.1-encoded Kerberos message in lib/krb5/asn.1/asn1_encode.c may lead to DoS

Severity Score

7.5

*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

*KEV

Decision

*SSVC

Descriptions

MIT Kerberos 5 (aka krb5) before 1.17.2 and 1.18.x before 1.18.3 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.

MIT Kerberos versión 5 (también se conoce como krb5) versiones anteriores a 1.17.2 y versiones 1.18.x anteriores a 1.18.3, permite una recursividad ilimitada por medio de un mensaje Kerberos codificado en ASN.1 porque el soporte de la biblioteca lib/krb5 /asn.1/asn1_encode.c para longitudes indefinidas BER carece un límite de recursividad

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.

*Credits: N/A

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

None

Availability

High

Attack Vector

Network

Attack Complexity

Low

Authentication

None

Confidentiality

None

Integrity

None

Availability

Partial

* Common Vulnerability Scoring System

SSVC

Decision:-

Exploitation

Automatable

Tech. Impact

* Organization's Worst-case Scenario

Timeline

2020-11-03 CVE Reserved
2020-11-06 CVE Published
2024-08-04 CVE Updated
2024-09-10 EPSS Updated
---------- Exploited in Wild
---------- KEV Due Date
---------- First Exploit

CWE

CWE-674: Uncontrolled Recursion

CAPEC

References (16)

URL	Tag	Source
https://lists.apache.org/thread.html/r58af02e294bd07f487e2c64ffc0a29b837db5600e33b6e698b9d696b%40%3Cissues.bookkeeper.apache.org%3E	Mailing List
https://lists.apache.org/thread.html/rf4c02775860db415b4955778a131c2795223f61cb8c6a450893651e4%40%3Cissues.bookkeeper.apache.org%3E	Mailing List
https://lists.debian.org/debian-lts-announce/2020/11/msg00011.html	Mailing List
https://security.netapp.com/advisory/ntap-20201202-0001	Third Party Advisory
https://security.netapp.com/advisory/ntap-20210513-0002	Third Party Advisory

URL	Date	SRC

URL	Date	SRC
https://github.com/krb5/krb5/commit/57415dda6cf04e73ffc3723be518eddfae599bfd	2023-11-07
https://www.oracle.com//security-alerts/cpujul2021.html	2023-11-07
https://www.oracle.com/security-alerts/cpuApr2021.html	2023-11-07
https://www.oracle.com/security-alerts/cpuapr2022.html	2023-11-07

URL	Date	SRC
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/45KKOZQWIIIW5C45PJVGQ32AXBSYNBE7	2023-11-07
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/73IGOG6CZAVMVNS4GGRMOLOZ7B6QVA7F	2023-11-07
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/KPH2V3WSQTELROZK3GFCPQDOFLKIZ6H5	2023-11-07
https://security.gentoo.org/glsa/202011-17	2023-11-07
https://www.debian.org/security/2020/dsa-4795	2023-11-07
https://access.redhat.com/security/cve/CVE-2020-28196	2021-06-03
https://bugzilla.redhat.com/show_bug.cgi?id=1901041	2021-06-03

Affected Vendors, Products, and Versions

Vendor		Product				Version		Other		Status
Vendor	Product	Version	Other	Status	<-- -->	Vendor	Product	Version	Other	Status
Mit Search vendor "Mit"		Kerberos 5 Search vendor "Mit" for product "Kerberos 5"				< 1.17.2 Search vendor "Mit" for product "Kerberos 5" and version " < 1.17.2"		-		Affected
Mit Search vendor "Mit"		Kerberos 5 Search vendor "Mit" for product "Kerberos 5"				>= 1.18.0 < 1.18.3 Search vendor "Mit" for product "Kerberos 5" and version " >= 1.18.0 < 1.18.3"		-		Affected
Fedoraproject Search vendor "Fedoraproject"		Fedora Search vendor "Fedoraproject" for product "Fedora"				31 Search vendor "Fedoraproject" for product "Fedora" and version "31"		-		Affected
Netapp Search vendor "Netapp"		Active Iq Unified Manager Search vendor "Netapp" for product "Active Iq Unified Manager"				-		vmware_vsphere		Affected
Netapp Search vendor "Netapp"		Active Iq Unified Manager Search vendor "Netapp" for product "Active Iq Unified Manager"				-		windows		Affected
Netapp Search vendor "Netapp"		Cloud Backup Search vendor "Netapp" for product "Cloud Backup"				-		-		Affected
Netapp Search vendor "Netapp"		Oncommand Insight Search vendor "Netapp" for product "Oncommand Insight"				-		-		Affected
Netapp Search vendor "Netapp"		Oncommand Workflow Automation Search vendor "Netapp" for product "Oncommand Workflow Automation"				-		-		Affected
Netapp Search vendor "Netapp"		Snapcenter Search vendor "Netapp" for product "Snapcenter"				-		-		Affected
Oracle Search vendor "Oracle"		Communications Cloud Native Core Policy Search vendor "Oracle" for product "Communications Cloud Native Core Policy"				1.14.0 Search vendor "Oracle" for product "Communications Cloud Native Core Policy" and version "1.14.0"		-		Affected
Oracle Search vendor "Oracle"		Communications Offline Mediation Controller Search vendor "Oracle" for product "Communications Offline Mediation Controller"				12.0.0.3.0 Search vendor "Oracle" for product "Communications Offline Mediation Controller" and version "12.0.0.3.0"		-		Affected
Oracle Search vendor "Oracle"		Communications Pricing Design Center Search vendor "Oracle" for product "Communications Pricing Design Center"				12.0.0.3.0 Search vendor "Oracle" for product "Communications Pricing Design Center" and version "12.0.0.3.0"		-		Affected
Oracle Search vendor "Oracle"		Mysql Server Search vendor "Oracle" for product "Mysql Server"				<= 8.0.23 Search vendor "Oracle" for product "Mysql Server" and version " <= 8.0.23"		-		Affected