CVE-2020-18770 Denial of service in n/a
Medium 5.5
Published
Updated
Check this codebase for CVE-2020-18770 and fix it if it is affected.
What it is: CVE-2020-18770 is a medium-severity denial of service vulnerability in n/a, published on 22 Aug 2023. It can only be exploited from the same machine or local network, and only if a user opens a file or follows a link.
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2020-18770 exists.
Affected product: n/a. No package-level version data is available, so check the vendor advisory linked from the reference page.
Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.
Reference: https://insights.sbomify.com/CVE-2020-18770/ (Markdown: https://insights.sbomify.com/CVE-2020-18770/index.md)
A flaw in zziplib allows attackers to cause a denial of service via a crafted ZIP file, affecting applications using the library.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Local or same network only
- Victim action needed
- A user has to click or open something
- Fix
- Available
What is CVE-2020-18770?
CVE-2020-18770 is a medium-severity denial of service vulnerability in n/a, published on 22 Aug 2023. It can only be exploited from the same machine or local network, and only if a user opens a file or follows a link.
Official description
An issue was discovered in function zzip_disk_entry_to_file_header in mmapped.c in zziplib 0.13.69, which will lead to a denial-of-service.
Weakness: CWE-400
Which versions are affected by CVE-2020-18770?
It affects 1 product.
Linux distribution packages (29)
zziplib AlmaLinux:8 | All versions | 0.13.68-13.el8_10 |
zziplib-devel AlmaLinux:8 | All versions | 0.13.68-13.el8_10 |
zziplib-utils AlmaLinux:8 | All versions | 0.13.68-13.el8_10 |
zziplib AlmaLinux:9 | All versions | 0.13.71-11.el9_4 |
zziplib-devel AlmaLinux:9 | All versions | 0.13.71-11.el9_4 |
zziplib-utils AlmaLinux:9 | All versions | 0.13.71-11.el9_4 |
zziplib Red Hat:enterprise_linux:8::appstream | All versions | 0:0.13.68-13.el8_10 |
zziplib-debuginfo Red Hat:enterprise_linux:8::appstream | All versions | 0:0.13.68-13.el8_10 |
zziplib-debugsource Red Hat:enterprise_linux:8::appstream | All versions | 0:0.13.68-13.el8_10 |
zziplib-utils Red Hat:enterprise_linux:8::appstream | All versions | 0:0.13.68-13.el8_10 |
zziplib-utils-debuginfo Red Hat:enterprise_linux:8::appstream | All versions | 0:0.13.68-13.el8_10 |
zziplib-debuginfo Red Hat:enterprise_linux:8::crb | All versions | 0:0.13.68-13.el8_10 |
zziplib-debugsource Red Hat:enterprise_linux:8::crb | All versions | 0:0.13.68-13.el8_10 |
zziplib-devel Red Hat:enterprise_linux:8::crb | All versions | 0:0.13.68-13.el8_10 |
zziplib-utils-debuginfo Red Hat:enterprise_linux:8::crb | All versions | 0:0.13.68-13.el8_10 |
zziplib Red Hat:enterprise_linux:9::appstream | All versions | 0:0.13.71-11.el9_4 |
zziplib-debuginfo Red Hat:enterprise_linux:9::appstream | All versions | 0:0.13.71-11.el9_4 |
zziplib-debugsource Red Hat:enterprise_linux:9::appstream | All versions | 0:0.13.71-11.el9_4 |
zziplib-utils Red Hat:enterprise_linux:9::appstream | All versions | 0:0.13.71-11.el9_4 |
zziplib-utils-debuginfo Red Hat:enterprise_linux:9::appstream | All versions | 0:0.13.71-11.el9_4 |
zziplib-debuginfo Red Hat:enterprise_linux:9::crb | All versions | 0:0.13.71-11.el9_4 |
zziplib-debugsource Red Hat:enterprise_linux:9::crb | All versions | 0:0.13.71-11.el9_4 |
zziplib-devel Red Hat:enterprise_linux:9::crb | All versions | 0:0.13.71-11.el9_4 |
zziplib-utils-debuginfo Red Hat:enterprise_linux:9::crb | All versions | 0:0.13.71-11.el9_4 |
zziplib Rocky Linux:8 | All versions | 0:0.13.68-13.el8_10 |
zziplib Rocky Linux:9 | All versions | 0:0.13.71-11.el9_4 |
zziplib SUSE:Linux Enterprise Software Development Kit 12 SP5 | All versions | 0.13.67-10.36.1 |
zziplib SUSE:Linux Enterprise Workstation Extension 12 SP5 | All versions | 0.13.67-10.36.1 |
zziplib openSUSE:Tumbleweed | All versions | 0.13.72-3.1 |
Products include Gdraheim Zziplib.
How do I fix CVE-2020-18770?
Upgrade to a fixed version.
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-2020-18770 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2020-18770 exists.
Other vulnerabilities in n/a
Sources
Also known as ALSA-2024:2377, ALSA-2024:3127, AZL-43720, AZL-44868, CLSA-2025-1755885569, DEBIAN-CVE-2020-18770 and 10 more.