Vulnerability Description
NTP 4.2.4 before 4.2.4p5 and 4.2.5 before 4.2.5p150 does not properly check the return value from the OpenSSL EVP_VerifyFinal function, which allows remote attackers to bypass validation of the certificate chain via a malformed SSL/TLS signature for DSA and ECDSA keys, a similar vulnerability to CVE-2008-5077.
CVSS Score
MEDIUM
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Ntp | Ntp | <= 4.2.4p4 |
Related Weaknesses (CWE)
References
- http://lists.apple.com/archives/security-announce/2009/May/msg00002.html
- http://lists.opensuse.org/opensuse-security-announce/2009-03/msg00000.html
- http://lists.opensuse.org/opensuse-security-announce/2009-04/msg00003.html
- http://secunia.com/advisories/33406Vendor Advisory
- http://secunia.com/advisories/33558Vendor Advisory
- http://secunia.com/advisories/33648Vendor Advisory
- http://secunia.com/advisories/34642Vendor Advisory
- http://secunia.com/advisories/35074Vendor Advisory
- http://slackware.com/security/viewer.php?l=slackware-security&y=2009&m=slackware
- http://support.apple.com/kb/HT3549
- http://www.ocert.org/advisories/ocert-2008-016.html
- http://www.redhat.com/support/errata/RHSA-2009-0046.html
- http://www.securityfocus.com/archive/1/499827/100/0/threaded
- http://www.securitytracker.com/id?1021533
- http://www.us-cert.gov/cas/techalerts/TA09-133A.htmlUS Government Resource
FAQ
What is CVE-2009-0021?
CVE-2009-0021 is a vulnerability with a CVSS score of 5.0 (MEDIUM). NTP 4.2.4 before 4.2.4p5 and 4.2.5 before 4.2.5p150 does not properly check the return value from the OpenSSL EVP_VerifyFinal function, which allows remote attackers to bypass validation of the certif...
How severe is CVE-2009-0021?
CVE-2009-0021 has been rated MEDIUM with a CVSS base score of 5.0/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2009-0021?
Check the references section above for vendor advisories and patch information. Affected products include: Ntp Ntp.