SB2021111040 - Red Hat Enterprise Linux 8 update for glibc
Published: November 10, 2021
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 3 secuirty vulnerabilities.
1) Double Free (CVE-ID: CVE-2021-27645)
The vulnerability allows a local user to perform a denial of service (DoS) attack.
The vulnerability exists due to a boundary error within the nameserver caching daemon (nscd) in the GNU C Library when processing a request for netgroup lookup. A local user can initiate a specially crafted request, trigger a double free error and perform a denial of service (DoS) attack.
2) Use-after-free (CVE-ID: CVE-2021-33574)
The vulnerability allows a remote attacker to compromise vulnerable system.
The vulnerability exists due to a use-after-free error in the mq_notify() function in the GNU C Library. A remote attacker can force the library to use the notification thread attributes object (passed through its struct
sigevent parameter) after it has been freed by the caller, leading to a
denial of service or possibly remote code execution.
Successful exploitation of the vulnerability may allow an attacker to compromise vulnerable system.
3) Integer overflow (CVE-ID: CVE-2021-35942)
The vulnerability allows a remote attacker to gain access to sensitive information or perform a DoS attack.
The vulnerability exists due to integer overflow in parse_param in posix/wordexp.c in the GNU C Library when called with an untrusted pattern. A remote attacker can pass specially crafted data to the application, trigger integer overflow and read arbitrary memory on the system of perform a denial of service (DoS) attack.
Successful exploitation of this vulnerability may result in complete compromise of vulnerable system.
Remediation
Install update from vendor's website.