# CVE-2016-0702: Information disclosure in n/a

> Local attackers can recover RSA private keys by exploiting cache timing side-channels during modular exponentiation on Intel Sandy Bridge CPUs.

- **Severity:** Medium 5.1 (`CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Local or same network only
- **Victim action needed:** Not needed
- **Fix available:** Yes
- **Published:** 3 Mar 2016
- **Updated:** 5 Aug 2024
- **Also known as:** DEBIAN-CVE-2016-0702, GHSA-q7xg-gmg7-59f4, UBUNTU-CVE-2016-0702

## What is CVE-2016-0702?

CVE-2016-0702 is a medium-severity vulnerability in Canonical Ubuntu Linux, published on 3 Mar 2016. It can only be exploited from the same machine or local network, with no action from the victim.

### Official description

The MOD_EXP_CTIME_COPY_FROM_PREBUF function in crypto/bn/bn_exp.c in OpenSSL 1.0.1 before 1.0.1s and 1.0.2 before 1.0.2g does not properly consider cache-bank access times during modular exponentiation, which makes it easier for local users to discover RSA keys by running a crafted application on the same Intel Sandy Bridge CPU core as a victim and leveraging cache-bank conflicts, aka a "CacheBleed" attack.

Weakness: CWE-200 (Exposure of Sensitive Information to an Unauthorized Actor)

## Which versions are affected by CVE-2016-0702?

It affects 4 products.


Products: Canonical Ubuntu Linux, Debian Debian Linux, Nodejs Node.js, Openssl Openssl.

## How do I fix CVE-2016-0702?

Upgrade to a fixed version.

## Is CVE-2016-0702 being exploited?

There is no known exploitation of CVE-2016-0702 in the wild and no public exploit code.

Public exploit code:

- https://github.com/Trinadh465/OpenSSL-1_0_1g_CVE-2016-0702 (github_poc): https://github.com/Trinadh465/OpenSSL-1_0_1g_CVE-2016-0702

## Other vulnerabilities in Canonical Ubuntu Linux

- [CVE-2020-11651](https://insights.sbomify.com/CVE-2020-11651/): SaltStack Salt Authentication Bypass (critical 9.8, exploited in the wild)
- [CVE-2020-7247](https://insights.sbomify.com/CVE-2020-7247/): OpenSMTPD Remote Code Execution (critical 9.8, exploited in the wild)
- [CVE-2019-16928](https://insights.sbomify.com/CVE-2019-16928/): Exim Out-of-bounds Write (critical 9.8, exploited in the wild)
- [CVE-2018-6789](https://insights.sbomify.com/CVE-2018-6789/): Exim Buffer Overflow (critical 9.8, exploited in the wild)
- [CVE-2015-2590](https://insights.sbomify.com/CVE-2015-2590/): Oracle Java SE and Java SE Embedded Remote Code Execution (critical 9.8, exploited in the wild)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2016-0702 and fix it if it is affected.

What it is: CVE-2016-0702 is a medium-severity vulnerability in Canonical Ubuntu Linux, published on 3 Mar 2016. It can only be exploited from the same machine or local network, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2016-0702 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-2016-0702/ (Markdown: https://insights.sbomify.com/CVE-2016-0702/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2016-0702
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2016-0702
- OSV: https://osv.dev/vulnerability/CVE-2016-0702

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From sbomify Insights: https://insights.sbomify.com/CVE-2016-0702/
Summaries are generated and may contain mistakes; the official description above is the record.