SB2020090303 - Multiple vulnerabilities in FreeBSD

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Main Vulnerability Database SB2020090303

SB2020090303 - Multiple vulnerabilities in FreeBSD

Published: September 3, 2020 Updated: November 30, 2022

Security Bulletin ID SB2020090303
Severity
Medium
Patch available
YES
Number of vulnerabilities 5
Exploitation vector Adjecent network
Highest impact Code execution

Breakdown by Severity

Medium 20% Low 80%
  • Low
  • Medium
  • High
  • Critical

Description

This security bulletin contains information about 5 secuirty vulnerabilities.


1) Reachable Assertion (CVE-ID: N/A)

The vulnerability allows a local user to perform a denial of service (DoS) attack.

The vulnerability exists due to improper handling of exec(3) calls in Linux ABI layer (Linuxulator) when calling processes with multiple threads. A local user can run a specially crafted program to trigger an assertion failure and cause kernel panic.

2) Access of Uninitialized Pointer (CVE-ID: N/A)

The vulnerability allows a local user to perform a denial of service (DoS) attack.

The vulnerability exists due to an error in internal interface used by getfsstat(2) compatibility system. A local unprivileged user can run a program that calls getfsstat(2) with an invalid argument, which causes getfsstat(2) to free an uninitialized pointer and results in kernel panic.


3) Use-after-free (CVE-ID: CVE-2020-7463)

The vulnerability allows a local user to perform a denial of service (DoS) attack.

The vulnerability exists due to a use-after-free error when processing SCTP messages. A local user can send large user messages from multiple threads on the same socket., trigger a use-after-free error and crash the system.



4) Heap-based buffer overflow (CVE-ID: CVE-2020-7461)

The vulnerability allows a remote attacker to execute arbitrary code on the target system.

The vulnerability exists due to a boundary error when parsing option 119 data in DHCP packets in dhclient(8). A remote attacker on the local network can send specially crafted data to the DHCP client, trigger heap-based buffer overflow and execute arbitrary code on the target system.

Successful exploitation of this vulnerability may result in complete compromise of vulnerable system.


5) Use-after-free (CVE-ID: CVE-2020-7462)

The vulnerability allows a local user to perform a denial of service (DoS) attack.

The vulnerability exists due to a use-after-free error when processing IPv6 packets. A local user can send IPv6 Hop-by-Hop options over the loopback interface and trigger kernel panic.



Remediation

Install update from vendor's website.

References