# CVE-2015-5309: Integer overflow in n/a

> Remote attackers can cause denial of service or execute arbitrary code via a crafted escape sequence in PuTTY, requiring user interaction to connect.

- **Severity:** Medium 4.3 (`AV:N/AC:M/Au:N/C:N/I:N/A:P`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** A user has to click or open something
- **Fix available:** Yes
- **Published:** 7 Dec 2015
- **Updated:** 6 Aug 2024
- **Also known as:** DEBIAN-CVE-2015-5309, DLA-347-1, DSA-3409-1, GHSA-xf6h-8pvx-cg8q, MGASA-2015-0442

## What is CVE-2015-5309?

CVE-2015-5309 is a medium-severity vulnerability in Opensuse Leap, published on 7 Dec 2015. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.

### Official description

Integer overflow in the terminal emulator in PuTTY before 0.66 allows remote attackers to cause a denial of service (memory corruption) or possibly execute arbitrary code via an ECH (erase characters) escape sequence with a large parameter value, which triggers a buffer underflow.

Weakness: CWE-189

## Which versions are affected by CVE-2015-5309?

It affects 3 products.


Products: Opensuse Leap, Opensuse Opensuse, Simon Tatham Putty.

## How do I fix CVE-2015-5309?

Upgrade to a fixed version.

## Is CVE-2015-5309 being exploited?

There is no known exploitation of CVE-2015-5309 in the wild and no public exploit code.

## Other vulnerabilities in Opensuse Leap

- [CVE-2015-4902](https://insights.sbomify.com/CVE-2015-4902/): Oracle Java SE Integrity Check (medium 5.3, exploited in the wild)
- [CVE-2017-14804](https://insights.sbomify.com/CVE-2017-14804/): package builds could use directory traversal to write outside of target area (critical 9.9)
- [CVE-2019-20787](https://insights.sbomify.com/CVE-2019-20787/): Teeworlds before 0.7.4 has an integer overflow when computing a tilemap size. (critical 9.8)
- [CVE-2019-8341](https://insights.sbomify.com/CVE-2019-8341/): Code injection in n/a (critical 9.8)
- [CVE-2019-6438](https://insights.sbomify.com/CVE-2019-6438/): Other in n/a (critical 9.8)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2015-5309 and fix it if it is affected.

What it is: CVE-2015-5309 is a medium-severity vulnerability in Opensuse Leap, published on 7 Dec 2015. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Exploitation: There is no known exploitation of CVE-2015-5309 in the wild and no public exploit code.

Affected product: Opensuse Leap. 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-2015-5309/ (Markdown: https://insights.sbomify.com/CVE-2015-5309/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2015-5309
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2015-5309
- OSV: https://osv.dev/vulnerability/CVE-2015-5309

---
From sbomify Insights: https://insights.sbomify.com/CVE-2015-5309/
Summaries are generated and may contain mistakes; the official description above is the record.