CVE-2018-7548 Null dereference in n/a
Critical 9.8
Published
Updated
Check this codebase for CVE-2018-7548 and fix it if it is affected.
What it is: CVE-2018-7548 is a critical vulnerability in Canonical Ubuntu Linux, published on 27 Feb 2018. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2018-7548 in the wild and no public exploit code.
Affected product: Canonical Ubuntu Linux. 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-2018-7548/ (Markdown: https://insights.sbomify.com/CVE-2018-7548/index.md)
A NULL pointer dereference in zsh allows attackers to cause a denial of service via crafted parameter expansion.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2018-7548?
CVE-2018-7548 is a critical vulnerability in Canonical Ubuntu Linux, published on 27 Feb 2018. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
In subst.c in zsh through 5.4.2, there is a NULL pointer dereference when using ${(PA)...} on an empty array result.
Weakness: CWE-476
Which versions are affected by CVE-2018-7548?
It affects 2 products.
Products include Canonical Ubuntu Linux, Zsh Zsh.
How do I fix CVE-2018-7548?
Upgrade to a fixed version.
Is CVE-2018-7548 being exploited?
There is no known exploitation of CVE-2018-7548 in the wild and no public exploit code.
Other vulnerabilities in Canonical Ubuntu Linux
Sources
Also known as DEBIAN-CVE-2018-7548, GHSA-52h6-vcv4-gr3c.