SB2021120809 - Multiple vulnerabilities in BusyBox

Main Vulnerability Database SB2021120809

SB2021120809 - Multiple vulnerabilities in BusyBox

Published: December 8, 2021 Updated: November 28, 2022

Security Bulletin ID SB2021120809

Severity

Medium

Patch available

YES

Number of vulnerabilities 14

Exploitation vector Remote access

Highest impact Data manipulation

Breakdown by Severity

Low
Medium
High
Critical

Description

This security bulletin contains information about 14 secuirty vulnerabilities.

1) Out-of-bounds read (CVE-ID: CVE-2021-42374)

The vulnerability allows a remote attacker to gain access to potentially sensitive information.

The vulnerability exists due to a boundary condition in "unlzma". A remote attacker can trigger out-of-bounds read error and read contents of memory on the system or perform a denial of service (DoS) attack.

2) Use-after-free (CVE-ID: CVE-2021-42380)

The vulnerability allows a remote user to compromise vulnerable system.

The vulnerability exists due to a use-after-free error in the "next_input_file" function. A remote administrator can execute arbitrary code on the target system.

3) Use-after-free (CVE-ID: CVE-2021-42379)

The vulnerability allows a remote user to compromise vulnerable system.

The vulnerability exists due to a use-after-free error in the "next_input_file" function. A remote administrator can execute arbitrary code on the target system.

4) Use-after-free (CVE-ID: CVE-2021-42384)

The vulnerability allows a remote user to compromise vulnerable system.

The vulnerability exists due to a use-after-free error in the "handle_special" function. A remote administrator can execute arbitrary code on the target system.

5) Use-after-free (CVE-ID: CVE-2021-42382)

The vulnerability allows a remote user to compromise vulnerable system.

The vulnerability exists due to a use-after-free error in the "getvar_s" function. A remote administrator can execute arbitrary code on the target system.

6) Use-after-free (CVE-ID: CVE-2021-42385)

The vulnerability allows a remote user to compromise vulnerable system.

The vulnerability exists due to a use-after-free error in the "evaluate" function. A remote administrator can execute arbitrary code on the target system.

7) Use-after-free (CVE-ID: CVE-2021-42378)

The vulnerability allows a remote user to compromise vulnerable system.

The vulnerability exists due to a use-after-free error in the "getvar_i" function. A remote administrator can execute arbitrary code on the target system.

8) Use-after-free (CVE-ID: CVE-2021-42386)

The vulnerability allows a remote user to compromise vulnerable system.

The vulnerability exists due to a use-after-free error in the "nvalloc" function. A remote administrator can execute arbitrary code on the target system.

9) Use-after-free (CVE-ID: CVE-2021-42381)

The vulnerability allows a remote user to compromise vulnerable system.

The vulnerability exists due to a use-after-free error in the "hash_init" function. A remote administrator can execute arbitrary code on the target system.

10) NULL pointer dereference (CVE-ID: CVE-2021-42376)

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

The vulnerability exists due to a NULL pointer dereference error in Busybox's hush applet when processing a crafted shell command with a \x03 delimiter character. A local user can pass specially crafted string to the affected applet and crash the application.

11) Use-after-free (CVE-ID: CVE-2021-42383)

The vulnerability allows a remote user to compromise vulnerable system.

The vulnerability exists due to a use-after-free error within the awk applet. A remote privileged user can pass a specially crafted input to the application, trigger a use-after-free error and execute arbitrary code.

Successful exploitation of the vulnerability may allow an attacker to compromise vulnerable system.

12) Input validation error (CVE-ID: CVE-2021-42375)

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

The vulnerability exists due to insufficient validation of user-supplied input within the ash applet. A remote user can pass specially crafted input to the application and perform a denial of service (DoS) attack.

13) NULL pointer dereference (CVE-ID: CVE-2021-42373)

The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to a NULL pointer dereference error within the man applet when a section name is supplied but no page argument is given. A remote attacker can pass specially crafted data to the application and perform a denial of service (DoS) attack.

14) Release of invalid pointer or reference (CVE-ID: CVE-2021-42377)

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

The vulnerability exists due to improper input validation within the hush applet. A remote attacker can pass a specially crafted input to the application and potentially execute arbitrary shell commands.

Remediation

Install update from vendor's website.

References