SB2021031716 - Red Hat Enterprise Linux 7.6 update for nss and nss-softokn
Published: March 17, 2021
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 4 secuirty vulnerabilities.
1) Use-after-free (CVE-ID: CVE-2019-11756)
The vulnerability allows a remote attacker to compromise vulnerable system.
The vulnerability exists due to a use-after-free error when processing SFTKSession object. A remote attacker can create a specially crafted web page, trick the victim into opening it, trigger a use-after-free error and crash the application or execute arbitrary code on the target system.
Successful exploitation of the vulnerability may allow an attacker to compromise vulnerable system.
2) Heap-based buffer overflow (CVE-ID: CVE-2019-17006)
The vulnerability allows a remote attacker to execute arbitrary code on the target system.
The vulnerability exists due to a boundary error in Mozilla NSS library when processing input text length while using certain cryptographic primitives. A remote attacker can pass specially crafted data to the application, 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.
3) Input validation error (CVE-ID: CVE-2019-17007)
The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.
The vulnerability exists due to insufficient validation of user-supplied input within the collect_certs() function in /lib/pkcs7/certread.c in Mozilla NSS library. A remote attacker can supply a specially crafted certificate to the application and perform a denial of service attack.
4) Out-of-bounds read (CVE-ID: CVE-2020-12403)
The vulnerability allows a remote attacker to gain access to potentially sensitive information.
The vulnerability exists due to a boundary condition when processing data encrypted with CHACHA20-POLY1305 ciphersuite. A remote attacker can trick the victim to connect to a malicious server and gain access to sensitive information.
Remediation
Install update from vendor's website.