CVE-2020-28196 Denial of service in n/a
An attacker can cause a denial of service in MIT Kerberos 5 by sending a specially crafted ASN.1-encoded message that triggers unbounded recursion.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2020-28196?
CVE-2020-28196 is a high-severity denial of service vulnerability in Fedoraproject Fedora, published on 6 Nov 2020. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
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.
Weakness: CWE-674
Which versions are affected by CVE-2020-28196?
It affects 11 products.
Linux distribution packages (40)
krb5 Red Hat:enterprise_linux:8::baseos | All versions | 0:1.18.2-8.el8 |
krb5-debuginfo Red Hat:enterprise_linux:8::baseos | All versions | 0:1.18.2-8.el8 |
krb5-debugsource Red Hat:enterprise_linux:8::baseos | All versions | 0:1.18.2-8.el8 |
krb5-devel Red Hat:enterprise_linux:8::baseos | All versions | 0:1.18.2-8.el8 |
krb5-devel-debuginfo Red Hat:enterprise_linux:8::baseos | All versions | 0:1.18.2-8.el8 |
krb5-libs Red Hat:enterprise_linux:8::baseos | All versions | 0:1.18.2-8.el8 |
krb5-libs-debuginfo Red Hat:enterprise_linux:8::baseos | All versions | 0:1.18.2-8.el8 |
krb5-pkinit Red Hat:enterprise_linux:8::baseos | All versions | 0:1.18.2-8.el8 |
krb5-pkinit-debuginfo Red Hat:enterprise_linux:8::baseos | All versions | 0:1.18.2-8.el8 |
krb5-server Red Hat:enterprise_linux:8::baseos | All versions | 0:1.18.2-8.el8 |
krb5-server-debuginfo Red Hat:enterprise_linux:8::baseos | All versions | 0:1.18.2-8.el8 |
krb5-server-ldap Red Hat:enterprise_linux:8::baseos | All versions | 0:1.18.2-8.el8 |
krb5-server-ldap-debuginfo Red Hat:enterprise_linux:8::baseos | All versions | 0:1.18.2-8.el8 |
krb5-workstation Red Hat:enterprise_linux:8::baseos | All versions | 0:1.18.2-8.el8 |
krb5-workstation-debuginfo Red Hat:enterprise_linux:8::baseos | All versions | 0:1.18.2-8.el8 |
libkadm5 Red Hat:enterprise_linux:8::baseos | All versions | 0:1.18.2-8.el8 |
libkadm5-debuginfo Red Hat:enterprise_linux:8::baseos | All versions | 0:1.18.2-8.el8 |
krb5 Rocky Linux:8 | All versions | 0:1.18.2-8.el8 |
krb5 SUSE:Enterprise Storage 5 | All versions | 1.12.5-40.40.2 |
krb5 SUSE:HPE Helion OpenStack 8 | All versions | 1.12.5-40.40.2 |
krb5 SUSE:Linux Enterprise High Performance Computing 15-ESPOS | All versions | 1.15.2-6.12.2 |
krb5 SUSE:Linux Enterprise High Performance Computing 15-LTSS | All versions | 1.15.2-6.12.2 |
krb5 SUSE:Linux Enterprise Module for Basesystem 15 SP1 | All versions | 1.16.3-3.15.1 |
krb5 SUSE:Linux Enterprise Module for Basesystem 15 SP2 | All versions | 1.16.3-3.15.1 |
krb5 SUSE:Linux Enterprise Module for Server Applications 15 SP1 | All versions | 1.16.3-3.15.1 |
krb5 SUSE:Linux Enterprise Module for Server Applications 15 SP2 | All versions | 1.16.3-3.15.1 |
krb5 SUSE:Linux Enterprise Server 12 SP2-BCL | All versions | 1.12.5-40.40.2 |
krb5 SUSE:Linux Enterprise Server 12 SP2-LTSS | All versions | 1.12.5-40.40.2 |
krb5 SUSE:Linux Enterprise Server 12 SP3-BCL | All versions | 1.12.5-40.40.2 |
krb5 SUSE:Linux Enterprise Server 12 SP3-LTSS | All versions | 1.12.5-40.40.2 |
krb5 SUSE:Linux Enterprise Server 12 SP4-LTSS | All versions | 1.12.5-40.40.2 |
krb5 SUSE:Linux Enterprise Server 12 SP5 | All versions | 1.12.5-40.40.2 |
krb5 SUSE:Linux Enterprise Server 15-LTSS | All versions | 1.15.2-6.12.2 |
krb5 SUSE:Linux Enterprise Server for SAP Applications 12 SP2 | All versions | 1.12.5-40.40.2 |
krb5 SUSE:Linux Enterprise Server for SAP Applications 12 SP3 | All versions | 1.12.5-40.40.2 |
krb5 SUSE:Linux Enterprise Server for SAP Applications 12 SP4 | All versions | 1.12.5-40.40.2 |
krb5 SUSE:Linux Enterprise Server for SAP Applications 12 SP5 | All versions | 1.12.5-40.40.2 |
krb5 SUSE:Linux Enterprise Server for SAP Applications 15 | All versions | 1.15.2-6.12.2 |
krb5 SUSE:Linux Enterprise Software Development Kit 12 SP5 | All versions | 1.12.5-40.40.2 |
krb5 SUSE:OpenStack Cloud 7 | All versions | 1.12.5-40.40.2 |
Products include Fedoraproject Fedora, Mit Kerberos 5, Netapp Active Iq Unified Manager, Netapp Cloud Backup, Netapp Oncommand Insight, Netapp Oncommand Workflow Automation and 5 more.
How do I fix CVE-2020-28196?
Upgrade to a fixed version.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2020-28196 being exploited?
There is no known exploitation of CVE-2020-28196 in the wild and no public exploit code.
Other vulnerabilities in Fedoraproject Fedora
Sources
Also known as ALPINE-CVE-2020-28196, CLEANSTART-2024-LQ59066, DEBIAN-CVE-2020-28196, DLA-2437-1, DSA-4795-1, GHSA-2wgw-3mv7-47xf and 11 more.