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Vulnerability · Published Nov 6, 2020 · Assigned by mitre

CVE-2020-28196

High 7.5

In plain English

A high-severity security flaw in the krb5 package (Alpine). There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 4.4% (higher than 91% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)7.5High
Exploit odds (30 days)4.4%top 8.6% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known

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.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
Alpine:v3.20krb51.18.3-r0ALPINE-CVE-2020-28196
Alpine:v3.21krb51.18.3-r0ALPINE-CVE-2020-28196
Alpine:v3.22krb51.18.3-r0ALPINE-CVE-2020-28196
Alpine:v3.23krb51.18.3-r0ALPINE-CVE-2020-28196
Alpine:v3.24krb51.18.3-r0ALPINE-CVE-2020-28196
Debian:12krb51.18.3-1DEBIAN-CVE-2020-28196
Debian:13krb51.18.3-1DEBIAN-CVE-2020-28196
Debian:14krb51.18.3-1DEBIAN-CVE-2020-28196
Rocky Linux:8krb50:1.18.2-8.el8RLSA-2021:1593

Affected products (as reported)

VendorProductVersions
n/a n/a n/a

Weakness: CWE-674 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

References