Ubuntu update for nss

1) Allocation of Resources Without Limits or Throttling

EUVDB-ID: #VU47910

Risk: Medium

CVSSv3.1: 6.5 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2020-25648

CWE-ID: CWE-770 - Allocation of Resources Without Limits or Throttling

Exploit availability: No

Description

The vulnerability allows a remote non-authenticated attacker to perform a denial of service (DoS) attack.

A flaw was found in the way NSS handled CCS (ChangeCipherSpec) messages in TLS 1.3. This flaw allows a remote attacker to send multiple CCS messages, causing a denial of service for servers compiled with the NSS library. The highest threat from this vulnerability is to system availability. This flaw affects NSS versions before 3.58.

Mitigation

Update the affected package nss to the latest version.

Vulnerable software versions

Ubuntu: 18.04 - 20.04

libnss3 (Ubuntu package): before 2:3.35-2ubuntu2.14

CPE2.3

• cpe:2.3:o:canonical:ubuntu:18.04:*:*:*:*:*:*:
• cpe:2.3:o:canonical:ubuntu:20.04:*:*:*:*:*:*:
• cpe:2.3:o:canonical:libnss3_ubuntu_package:*:*:*:*:*:ubuntu:*:

External links

http://ubuntu.com/security/notices/USN-5410-1

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.