CVE-2020-18442 Denial of service in n/a

Low 3.3 Published 18 Jun 2021 Updated 4 Aug 2024

Remote attackers can cause a denial of service in zziplib via an infinite loop in the unzzip_cat_file function.

Exploited in the wild: Not known
Login needed: Any signed-in user
Attackable: Local or same network only
Victim action needed: Not needed
Fix: Available

What is CVE-2020-18442?

CVE-2020-18442 is a low-severity denial of service vulnerability in Debian Debian Linux, published on 18 Jun 2021. It can only be exploited from the same machine or local network, with no action from the victim.

Official description

Infinite Loop in zziplib v0.13.69 allows remote attackers to cause a denial of service via the return value "zzip_file_read" in the function "unzzip_cat_file".

Weakness: CWE-835

Which versions are affected by CVE-2020-18442?

It affects 3 products.

Linux distribution packages (15)

`zziplib` AlmaLinux:8	All versions	`0.13.68-9.el8`
`zziplib-devel` AlmaLinux:8	All versions	`0.13.68-9.el8`
`zziplib-utils` AlmaLinux:8	All versions	`0.13.68-9.el8`
`zziplib` Red Hat:enterprise_linux:8::appstream	All versions	`0:0.13.68-9.el8`
`zziplib-debuginfo` Red Hat:enterprise_linux:8::appstream	All versions	`0:0.13.68-9.el8`
`zziplib-debugsource` Red Hat:enterprise_linux:8::appstream	All versions	`0:0.13.68-9.el8`
`zziplib-utils` Red Hat:enterprise_linux:8::appstream	All versions	`0:0.13.68-9.el8`
`zziplib-utils-debuginfo` Red Hat:enterprise_linux:8::appstream	All versions	`0:0.13.68-9.el8`
`zziplib-debuginfo` Red Hat:enterprise_linux:8::crb	All versions	`0:0.13.68-9.el8`
`zziplib-debugsource` Red Hat:enterprise_linux:8::crb	All versions	`0:0.13.68-9.el8`
`zziplib-devel` Red Hat:enterprise_linux:8::crb	All versions	`0:0.13.68-9.el8`
`zziplib-utils-debuginfo` Red Hat:enterprise_linux:8::crb	All versions	`0:0.13.68-9.el8`
`zziplib` Rocky Linux:8	All versions	`0:0.13.68-9.el8`
`zziplib` SUSE:Linux Enterprise Software Development Kit 12 SP5	All versions	`0.13.67-10.33.1`
`zziplib` SUSE:Linux Enterprise Workstation Extension 12 SP5	All versions	`0.13.67-10.33.1`

Products include Debian Debian Linux, Fedoraproject Fedora, Gdraheim Zziplib.

How do I fix CVE-2020-18442?

Apply the vendor's patch.

Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.

Is CVE-2020-18442 being exploited?

There is no known exploitation of CVE-2020-18442 in the wild and no public exploit code.

All Debian Debian Linux vulnerabilities

Sources

Also known as ALSA-2021:4316, DEBIAN-CVE-2020-18442, DLA-2859-1, GHSA-g2w2-2g9v-p7fp, MGASA-2021-0359, OESA-2021-1247 and 4 more.