CVE-2006-4339
CRITICALCVSS 9.1/10EPSS 3.95%
Last modified
CVE-2006-4339 is a critical-severity vulnerability rated 9.1/10 on the CVSS scale. A flaw was found in OpenSSL. When configured to use an RSA key with exponent 3, OpenSSL improperly removes PKCS-1 padding before generating a hash. EPSS estimates a 3.95% chance of exploitation in the next 30 days.
Description
A flaw was found in OpenSSL. When configured to use an RSA key with exponent 3, OpenSSL improperly removes PKCS-1 padding before generating a hash. This allows remote attackers to forge PKCS #1 v1.5 signatures. Consequently, OpenSSL may incorrectly verify X.509 and other certificates, leading to a bypass of trust and authentication mechanisms.
Metrics
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Openssl | Openssl | <= 0.9.7 |
| Openssl | Openssl | 0.9.1c |
| Openssl | Openssl | 0.9.2b |
| Openssl | Openssl | 0.9.3 |
| Openssl | Openssl | 0.9.3a |
| Openssl | Openssl | 0.9.4 |
| Openssl | Openssl | 0.9.5 |
| Openssl | Openssl | 0.9.5a |
| Openssl | Openssl | 0.9.6 |
| Openssl | Openssl | 0.9.6a |
| Openssl | Openssl | 0.9.6b |
| Openssl | Openssl | 0.9.6c |
| Openssl | Openssl | 0.9.6d |
| Openssl | Openssl | 0.9.6e |
| Openssl | Openssl | 0.9.6f |
| Openssl | Openssl | 0.9.6g |
| Openssl | Openssl | 0.9.6h |
| Openssl | Openssl | 0.9.6i |
| Openssl | Openssl | 0.9.6j |
| Openssl | Openssl | 0.9.6k |
| Openssl | Openssl | 0.9.6l |
| Openssl | Openssl | 0.9.6m |
| Openssl | Openssl | 0.9.7a |
| Openssl | Openssl | 0.9.7b |
| Openssl | Openssl | 0.9.7c |
| Openssl | Openssl | 0.9.7d |
| Openssl | Openssl | 0.9.7e |
| Openssl | Openssl | 0.9.7f |
| Openssl | Openssl | 0.9.7g |
| Openssl | Openssl | 0.9.7h |
| Openssl | Openssl | 0.9.7i |
| Openssl | Openssl | 0.9.7j |
| Openssl | Openssl | 0.9.8 |
| Openssl | Openssl | 0.9.8a |
| Openssl | Openssl | 0.9.8b |
References
- https://secunia.com/advisories/21709Patch, Vendor Advisory
- https://secunia.com/advisories/21767Vendor Advisory
- https://secunia.com/advisories/21776Vendor Advisory
- https://secunia.com/advisories/21778Vendor Advisory
- https://secunia.com/advisories/21785Vendor Advisory
- https://secunia.com/advisories/21791Vendor Advisory
- https://secunia.com/advisories/21812Vendor Advisory
- https://secunia.com/advisories/21823Vendor Advisory
- https://secunia.com/advisories/21846Vendor Advisory
- https://secunia.com/advisories/21852Vendor Advisory
- https://secunia.com/advisories/21870Vendor Advisory
- https://secunia.com/advisories/21873Vendor Advisory
- https://secunia.com/advisories/21906Vendor Advisory
- https://secunia.com/advisories/21927Vendor Advisory
- https://secunia.com/advisories/21930Vendor Advisory
- https://secunia.com/advisories/21982Vendor Advisory
- https://secunia.com/advisories/22036Vendor Advisory
- https://secunia.com/advisories/22161Vendor Advisory
- https://secunia.com/advisories/22226Vendor Advisory
- https://secunia.com/advisories/22232Vendor Advisory
- https://secunia.com/advisories/22259Vendor Advisory
- https://secunia.com/advisories/22260Vendor Advisory
- https://www.kb.cert.org/vuls/id/845620US Government Resource
- https://www.openssl.org/news/secadv_20060905.txtPatch, Vendor Advisory
- https://www.redhat.com/support/errata/RHSA-2006-0661.htmlVendor Advisory
- https://www.us-cert.gov/cas/techalerts/TA06-333A.htmlUS Government Resource
- https://secunia.com/advisories/21709Patch, Vendor Advisory
- https://secunia.com/advisories/21767Vendor Advisory
- https://secunia.com/advisories/21776Vendor Advisory
- https://secunia.com/advisories/21778Vendor Advisory
- https://secunia.com/advisories/21785Vendor Advisory
- https://secunia.com/advisories/21791Vendor Advisory
- https://secunia.com/advisories/21812Vendor Advisory
- https://secunia.com/advisories/21823Vendor Advisory
- https://secunia.com/advisories/21846Vendor Advisory
- https://secunia.com/advisories/21852Vendor Advisory
- https://secunia.com/advisories/21870Vendor Advisory
- https://secunia.com/advisories/21873Vendor Advisory
- https://secunia.com/advisories/21906Vendor Advisory
- https://secunia.com/advisories/21927Vendor Advisory
- https://secunia.com/advisories/21930Vendor Advisory
- https://secunia.com/advisories/21982Vendor Advisory
- https://secunia.com/advisories/22036Vendor Advisory
- https://secunia.com/advisories/22161Vendor Advisory
- https://secunia.com/advisories/22226Vendor Advisory
- https://secunia.com/advisories/22232Vendor Advisory
- https://secunia.com/advisories/22259Vendor Advisory
- https://secunia.com/advisories/22260Vendor Advisory
- https://www.kb.cert.org/vuls/id/845620US Government Resource
- https://www.openssl.org/news/secadv_20060905.txtPatch, Vendor Advisory
- https://www.redhat.com/support/errata/RHSA-2006-0661.htmlVendor Advisory
- https://www.us-cert.gov/cas/techalerts/TA06-333A.htmlUS Government Resource
Timeline
- Published
- Last Modified
- Status
- Modified
Frequently Asked Questions
What is CVE-2006-4339?
A flaw was found in OpenSSL. When configured to use an RSA key with exponent 3, OpenSSL improperly removes PKCS-1 padding before generating a hash. This allows remote attackers to forge PKCS #1 v1.5 signatures. Consequently, OpenSSL may incorrectly verify X.509 and other certificates, leading to a bypass of trust and authentication mechanisms.
How severe is CVE-2006-4339?
CVE-2006-4339 has a CVSS score of 9.1/10 (CRITICAL severity). The EPSS model estimates a 3.95% probability of exploitation in the next 30 days.
How do I fix CVE-2006-4339?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.
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