SB2019081438 - OpenSUSE Linux update for libheimdal

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Main Vulnerability Database SB2019081438

SB2019081438 - OpenSUSE Linux update for libheimdal

Published: August 14, 2019

Security Bulletin ID SB2019081438
Severity
Medium
Patch available
YES
Number of vulnerabilities 2
Exploitation vector Remote access
Highest impact Code execution

Breakdown by Severity

Medium 50% Low 50%
  • Low
  • Medium
  • High
  • Critical

Description

This security bulletin contains information about 2 secuirty vulnerabilities.


1) Improper Authentication (CVE-ID: CVE-2018-16860)

The vulnerability allows a remote authenticated user to compromise vulnerable domain.

The vulnerability exists due to an error within the process of obtaining kerberos ticket for a service from the Kerberos Key Distribution Center (KDC) that involves S4U2Self and S4U2Proxy extensions. A remote authenticated user can impersonate another service on the network and obtain elevated privileges within the domain.

Successful exploitation of the vulnerability may allow an attacker to compromise vulnerable Active Directory implementation.


2) Key management errors (CVE-ID: CVE-2019-12098)

The vulnerability allows a remote attacker to perform a Man-in-the-Middle (MitM) attack.

The vulnerability exists due to Heimdal fails to verify anonymous PKINIT PA-PKINIT-KX key exchange within the krb5_init_creds_step() function in lib/krb5/init_creds_pw.c. A remote attacker can perform a MitM attack against the Heimdal client.


Remediation

Install update from vendor's website.

References