SB2021111637 - Fedora 33 update for busybox
Published: November 16, 2021
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 14 secuirty vulnerabilities.
1) 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.
2) 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.
3) 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.
4) 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.
5) 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.
6) 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.
7) 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.
8) 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.
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) 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.
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) 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.
13) 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.
14) 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.
Remediation
Install update from vendor's website.