SB2021032540 - Multiple vulnerabilities in Red Hat Advanced Cluster Management for Kubernetes 2.1
Published: March 25, 2021
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 10 secuirty vulnerabilities.
1) Infinite loop (CVE-ID: CVE-2020-14040)
The vulnerability allows a remote non-authenticated attacker to perform a denial of service (DoS) attack.
The x/text package before 0.3.3 for Go has a vulnerability in encoding/unicode that could lead to the UTF-16 decoder entering an infinite loop, causing the program to crash or run out of memory. An attacker could provide a single byte to a UTF16 decoder instantiated with UseBOM or ExpectBOM to trigger an infinite loop if the String function on the Decoder is called, or the Decoder is passed to golang.org/x/text/transform.String.
2) Buffer overflow (CVE-ID: CVE-2020-8625)
The vulnerability allows a remote attacker to execute arbitrary code on the target system.
The vulnerability exists due to a boundary error within the SPNEGO implementation in the GSS-TSIG extension. A remote attacker can send a specially crafted DNS request to the server, trigger memory corruption and execute arbitrary code on the target system.
Successful exploitation of this vulnerability may result in complete compromise of vulnerable system.
3) Security restrictions bypass (CVE-ID: CVE-2020-14372)
The vulnerability allows a local privileged user to bypass implemented security restrictions.
The vulnerability exists due to GRUB enables usage of the acpi command even when Secure Boot is enabled by firmware. A local user with root privileges can put a small SSDT into /boot/efi folder and modify the grub.cfg file to load that SSDT during kernel boot. The SSDT then gets run by the kernel and it overwrites the kernel lock down configuration enabling the attacker to load unsigned kernel modules and kexec unsigned code.
4) Use-after-free (CVE-ID: CVE-2020-25632)
The vulnerability allows a local user to bypass implemented security restrictions.
The vulnerability exists due to a use-after-free error when handling module unloads. A local privileged user can unload a kernel module, trigger a use-after-free error and bypass Secure Boot protection mechanism.
5) Out-of-bounds write (CVE-ID: CVE-2020-25647)
The vulnerability allows a local user to escalate privileges on the system.
The vulnerability exists due to a boundary error when processing untrusted input from USB device in grub_usb_device_initialize(). An attacker with physical access to the system can trigger an out-of-bounds write error with a malicious USB drive, bypass Secure Boot protection and execute arbitrary code on the system with elevated privileges.
6) Stack-based buffer overflow (CVE-ID: CVE-2020-27749)
The vulnerability allows a local user to escalate privileges on the system.
The vulnerability exists due to a boundary error within the grub_parser_split_cmdline() function while expanding variable names present in the supplied command line in to their corresponding variable contents. A local privileged user can run a specially crafted program to trigger the stack-based buffer overflow and bypass Secure Boot protection.
7) Improper Authorization (CVE-ID: CVE-2020-27779)
The vulnerability allows a local user to bypass authorization checks.
The vulnerability exists within the cutmem command, which does not honor the Secure Boot locking. A local privileged user can remove address ranges from memory creating an opportunity to circumvent Secure Boot protections after proper triage about grub's memory layout.
8) Out-of-bounds write (CVE-ID: CVE-2021-20225)
The vulnerability allows a local user to escalate privileges on the system.
The vulnerability exists due to a boundary error within the option parser. A local privileged user can write past the end of a heap-allocated buffer by calling certain commands with a large number of specific short forms of options and execute arbitrary code with elevated privileges.
9) Improper Certificate Validation (CVE-ID: CVE-2021-20230)
The vulnerability allows a remote attacker to bypass implemented security restrictions.
The vulnerability exists due to improper client certificate validation, when redirect and verifyChain options are used. A remote attacker can bypass implemented security restrictions with a any valid certificated and gain access to sensitive information.
10) Out-of-bounds write (CVE-ID: CVE-2021-20233)
The vulnerability allows a local user to escalate privileges on the system.
The vulnerability exists due to a boundary error within the setparam_prefix() function in menu rendering code. A local privileged user can run a specially crafted program to trigger out-of-bounds write and escalate privileges on the system.
Remediation
Install update from vendor's website.