Ubuntu update for ncurses

1) Out-of-bounds write

EUVDB-ID: #VU82358

Risk: Low

CVSSv4.0: 1.1 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2020-19189

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

Exploit availability: No

Description

The vulnerability allows a local user to perform a denial of service (DoS) attack.

The vulnerability exists due to a boundary error within the postprocess_terminfo() function in tinfo/parse_entry. A local user can run a specially crafted command to trigger an out-of-bounds write and perform a denial of service (DoS) attack.

Mitigation

Update the affected package ncurses to the latest version.

Vulnerable software versions

Ubuntu: 14.04 - 18.04

libx32tinfo5 (Ubuntu package): before Ubuntu Pro

libx32ncursesw5 (Ubuntu package): before Ubuntu Pro

lib64ncurses5 (Ubuntu package): before Ubuntu Pro

lib64tinfo5 (Ubuntu package): before Ubuntu Pro

lib32ncurses5 (Ubuntu package): before Ubuntu Pro

lib32tinfo5 (Ubuntu package): before Ubuntu Pro

lib32ncursesw5 (Ubuntu package): before Ubuntu Pro

libx32ncurses5 (Ubuntu package): before Ubuntu Pro

libncurses5 (Ubuntu package): before Ubuntu Pro

ncurses-bin (Ubuntu package): before Ubuntu Pro

libtinfo5 (Ubuntu package): before Ubuntu Pro

libncursesw5 (Ubuntu package): before Ubuntu Pro

CPE2.3

• cpe:2.3:o:canonical:ubuntu:14.04:*:*:*:*:*:*:*
• cpe:2.3:o:canonical:ubuntu:16.04:*:*:*:*:*:*:*
• cpe:2.3:o:canonical:ubuntu:18.04:*:*:*:*:*:*:*
• cpe:2.3:a:canonical:libx32tinfo5_ubuntu_package:*:*:*:*:*:ubuntu:*:*
• cpe:2.3:a:canonical:libx32ncursesw5_ubuntu_package:*:*:*:*:*:ubuntu:*:*
• cpe:2.3:a:canonical:lib64ncurses5_ubuntu_package:*:*:*:*:*:ubuntu:*:*
• cpe:2.3:a:canonical:lib64tinfo5_ubuntu_package:*:*:*:*:*:ubuntu:*:*
• cpe:2.3:a:canonical:lib32ncurses5_ubuntu_package:*:*:*:*:*:ubuntu:*:*
• cpe:2.3:a:canonical:lib32tinfo5_ubuntu_package:*:*:*:*:*:ubuntu:*:*
• cpe:2.3:a:canonical:lib32ncursesw5_ubuntu_package:*:*:*:*:*:ubuntu:*:*
• cpe:2.3:a:canonical:libx32ncurses5_ubuntu_package:*:*:*:*:*:ubuntu:*:*
• cpe:2.3:a:canonical:libncurses5_ubuntu_package:*:*:*:*:*:ubuntu:*:*
• cpe:2.3:a:canonical:ncurses-bin_ubuntu_package:*:*:*:*:*:ubuntu:*:*
• cpe:2.3:a:canonical:libtinfo5_ubuntu_package:*:*:*:*:*:ubuntu:*:*
• cpe:2.3:a:canonical:libncursesw5_ubuntu_package:*:*:*:*:*:ubuntu:*:*

External links

https://ubuntu.com/security/notices/USN-6451-1

Q & A

Can this vulnerability be exploited remotely?

No. This vulnerability can be exploited locally. The attacker should have authentication credentials and successfully authenticate on the system.

Is there known malware, which exploits this vulnerability?

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