Ubuntu update for NSS

1) Out-of-bounds write

EUVDB-ID: #VU23050

Risk: High

CVSSv4.0: 8.1 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Amber]

CVE-ID: CVE-2019-11745

CWE-ID: CWE-787 - Out-of-bounds write

Exploit availability: No

Description

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.

Mitigation

Update the affected packages.

Ubuntu 19.10

libnss3 - 2:3.45-1ubuntu2.1

Ubuntu 19.04

libnss3 - 2:3.42-1ubuntu2.3

Ubuntu 18.04 LTS

libnss3 - 2:3.35-2ubuntu2.5

Ubuntu 16.04 LTS

libnss3 - 2:3.28.4-0ubuntu0.16.04.8

Vulnerable software versions

nss (Ubuntu package): 2:3.28.4-0ubuntu0.16.04.1 - 2:3.42-1ubuntu2.2

CPE2.3

• cpe:2.3:a:canonical:nss_ubuntu_package:2:3.28.4-0ubuntu0.16.04.1:*:*:*:*:ubuntu:*:*
• cpe:2.3:a:canonical:nss_ubuntu_package:2:3.28.4-0ubuntu0.16.04.2:*:*:*:*:ubuntu:*:*
• cpe:2.3:a:canonical:nss_ubuntu_package:2:3.28.4-0ubuntu0.16.04.3:*:*:*:*:ubuntu:*:*

External links

https://usn.ubuntu.com/4203-1/

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.