# CVE-2011-1923: Weak cryptography in n/a

> Man-in-the-middle attackers can obtain shared secret keys due to improper validation of Diffie-Hellman public parameters in PolarSSL.

- **Severity:** Medium 4.0 (`AV:N/AC:H/Au:N/C:P/I:P/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 20 Jun 2012
- **Updated:** 6 Aug 2024
- **Also known as:** GHSA-rwm6-hmj6-r6h5

## What is CVE-2011-1923?

CVE-2011-1923 is a medium-severity vulnerability in n/a, published on 20 Jun 2012. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

The Diffie-Hellman key-exchange implementation in dhm.c in PolarSSL before 0.14.2 does not properly validate a public parameter, which makes it easier for man-in-the-middle attackers to obtain the shared secret key by modifying network traffic, a related issue to CVE-2011-5095.

Weakness: CWE-310

## Which versions are affected by CVE-2011-1923?

It affects 1 product.


Products: Polarssl Polarssl.

## How do I fix CVE-2011-1923?

No fix has been published for CVE-2011-1923 yet. Limit exposure of the affected software until one is available.

## Is CVE-2011-1923 being exploited?

There is no known exploitation of CVE-2011-1923 in the wild and no public exploit code.

## Other vulnerabilities in n/a

- [CVE-2011-4574](https://insights.sbomify.com/CVE-2011-4574/): Weak cryptography in PolarSSL (critical 9.8)
- [CVE-2014-8628](https://insights.sbomify.com/CVE-2014-8628/): Denial of service in n/a (high 7.8)
- [CVE-2013-5914](https://insights.sbomify.com/CVE-2013-5914/): Buffer overflow in the ssl_read_record function in ssl_tls.c in PolarSSL before 1.1.8, when using TLS 1.1, might allow remote attackers to e (medium 6.8)
- [CVE-2014-8627](https://insights.sbomify.com/CVE-2014-8627/): Security feature bypass in n/a (medium 5.0)
- [CVE-2013-5915](https://insights.sbomify.com/CVE-2013-5915/): Information disclosure in n/a (medium 4.3)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2011-1923 and fix it if it is affected.

What it is: CVE-2011-1923 is a medium-severity vulnerability in n/a, published on 20 Jun 2012. 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-2011-1923 in the wild and no public exploit code.

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-2011-1923/ (Markdown: https://insights.sbomify.com/CVE-2011-1923/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2011-1923
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2011-1923
- OSV: https://osv.dev/vulnerability/CVE-2011-1923

---
From sbomify Insights: https://insights.sbomify.com/CVE-2011-1923/
Summaries are generated and may contain mistakes; the official description above is the record.