SB2018111705 - OpenSUSE Linux update for openssh

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Main Vulnerability Database SB2018111705

SB2018111705 - OpenSUSE Linux update for openssh

Published: November 17, 2018 Updated: March 9, 2023

Security Bulletin ID SB2018111705
Severity
Medium
Patch available
YES
Number of vulnerabilities 2
Exploitation vector Remote access
Highest impact Information disclosure

Breakdown by Severity

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

Description

This security bulletin contains information about 2 secuirty vulnerabilities.


1) User enumeration (CVE-ID: CVE-2018-15473)

The vulnerability allows a remote attacker to enumerate all accounts on the system.

The vulnerability exists due to a logical error in auth2-gss.c, auth2-hostbased.c, and auth2-pubkey.c files when processing authentication requests. A remote attacker can send a specially crafted chain of packets and monitor behavior of openssh server to determine presence of a valid username. The server will drop connection upon receiving a malformed authentication packets if the username is valid.


2) Information disclosure (CVE-ID: CVE-2018-15919)

The vulnerability allows a remote attacker to obtain potentially sensitive information.

The vulnerability exists due to insufficient validation of an authentication request packet when the Guide Star Server II (GSS2) component is used. A remote attacker can send an authentication request packet and access sensitive information, such as valid usernames.


Remediation

Install update from vendor's website.

References