SB2020040166 - Red Hat Enterprise Linux 7 update for nss-softokn
Published: April 1, 2020
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 2 secuirty vulnerabilities.
1) Memory-cache side-channel attack (CVE-ID: CVE-2018-0495)
The vulnerability allows a local attacker to obtain potentially sensitive information.
The vulnerability exists due to a leakage of information through memory caches when the affected library uses a private key to create Elliptic Curve Digital Signature Algorithm (ECDSA) signatures. A local attacker can conduct a memory-cache side-channel attack on ECDSA signatures and recover sensitive information, such as ECDSA private keys, which could be used to conduct further attacks.
Note: The vulnerability is known as the "Return Of the Hidden Number Problem" or ROHNP.
2) Out-of-bounds write (CVE-ID: CVE-2019-11745)
The vulnerability allows a remote attacker to compromise vulnerable system.
The vulnerability exists due to a boundary error when processing untrusted input within the NSC_EncryptUpdate() function in /lib/softoken/pkcs11c.c, when performing padding operations in Mozilla NSS. A remote attacker can pass specially crafted data to the affected application, trigger out-of-bounds write and execute arbitrary code on the target system.
Remediation
Install update from vendor's website.