SB2019120514 - Multiple vulnerabilities in OpenBSD

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Main Vulnerability Database SB2019120514

SB2019120514 - Multiple vulnerabilities in OpenBSD

Published: December 5, 2019

Security Bulletin ID SB2019120514
Severity
Medium
Patch available
NO
Number of vulnerabilities 4
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 4 secuirty vulnerabilities.


1) Resource management error (CVE-ID: CVE-2019-19522)

The vulnerability allows a local user to escalate privileges on the system.

The vulnerability exists due to an error in authentication process, where S/Key or YubiKey authentication is enabled. A local user can gain root privileges by leveraging membership in the auth group. This occurs because root's file can be written to /etc/skey or /var/db/yubikey, and need not be owned by root.


2) Resource management error (CVE-ID: CVE-2019-19520)

The vulnerability allows a local user to escalate privileges on the system.

The vulnerability exists within the xlock in OpenBSD 6.6, due to xenocara/lib/mesa/src/loader/loader.c mishandles dlopen. A local user can provide a specially crafted LIBGL_DRIVERS_PATH environment variable and gain privileges of the auth group.


3) Improper Authentication (CVE-ID: CVE-2019-19521)

The vulnerability allows a remote attacker to bypass authentication process.

The vulnerability exists due to an error in gen/auth_subr.c and gen/authenticate.c in libc, login/login.c and xenocara/app/xenodm/greeter/verify.c when handling authentication requests via the -schallenge username. A remote attacker can bypass authentication process for daemons that use vulnerable authentication scheme (e.g. smtpd, ldapd, or radiusd).

Successful exploitation of the vulnerability may allow an attacker to gain unauthorized access to the system.


4) Resource management error (CVE-ID: CVE-2019-19519)

The vulnerability allows a local user to escalate privileges on the system.

The vulnerability exists due to a logic error in the main function in su/su.c. A local user can use the su -L option to achieve any login class.


Remediation

Cybersecurity Help is not aware of any official remediation provided by the vendor.

References