# CVE-2017-9103: Memory corruption in n/a

> An attacker can cause crashes, memory leaks, or buffer overruns in applications using adns for specific DNS queries due to improper stack value handling.

- **Severity:** Critical 9.8 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** Yes
- **Published:** 18 Jun 2020
- **Updated:** 5 Aug 2024
- **Also known as:** DEBIAN-CVE-2017-9103, GHSA-q936-xr3r-7gqr, UBUNTU-CVE-2017-9103

## What is CVE-2017-9103?

CVE-2017-9103 is a critical memory corruption vulnerability in Fedoraproject Fedora, published on 18 Jun 2020. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

An issue was discovered in adns before 1.5.2. pap_mailbox822 does not properly check st from adns__findlabel_next. Without this, an uninitialised stack value can be used as the first label length. Depending on the circumstances, an attacker might be able to trick adns into crashing the calling program, leaking aspects of the contents of some of its memory, causing it to allocate lots of memory, or perhaps overrunning a buffer. This is only possible with applications which make non-raw queries for SOA or RP records.

Weakness: CWE-119 (Improper Restriction of Operations within the Bounds of a Memory Buffer)

## Which versions are affected by CVE-2017-9103?

It affects 3 products.


Products: Fedoraproject Fedora, Gnu Adns, Opensuse Leap.

## How do I fix CVE-2017-9103?

Upgrade to a fixed version.

## Is CVE-2017-9103 being exploited?

There is no known exploitation of CVE-2017-9103 in the wild and no public exploit code.

## Other vulnerabilities in Fedoraproject Fedora

- [CVE-2024-4577](https://insights.sbomify.com/CVE-2024-4577/): PHP-CGI OS Command Injection (critical 9.8, exploited in the wild)
- [CVE-2021-39226](https://insights.sbomify.com/CVE-2021-39226/): Grafana Authentication Bypass (critical 9.8, exploited in the wild)
- [CVE-2019-5544](https://insights.sbomify.com/CVE-2019-5544/): VMware ESXi and Horizon DaaS OpenSLP Heap-Based Buffer Overflow (critical 9.8, exploited in the wild)
- [CVE-2024-4947](https://insights.sbomify.com/CVE-2024-4947/): Google Chromium V8 Type Confusion (critical 9.6, exploited in the wild)
- [CVE-2024-4671](https://insights.sbomify.com/CVE-2024-4671/): Google Chromium Visuals Use-After-Free (critical 9.6, exploited in the wild)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2017-9103 and fix it if it is affected.

What it is: CVE-2017-9103 is a critical memory corruption vulnerability in Fedoraproject Fedora, published on 18 Jun 2020. 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-2017-9103 in the wild and no public exploit code.

Affected product: Fedoraproject Fedora. 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-2017-9103/ (Markdown: https://insights.sbomify.com/CVE-2017-9103/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2017-9103
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2017-9103
- OSV: https://osv.dev/vulnerability/CVE-2017-9103

---
From sbomify Insights: https://insights.sbomify.com/CVE-2017-9103/
Summaries are generated and may contain mistakes; the official description above is the record.