Auth bypass in Ntp
CVE-2009-0021
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.
Vulnerability class: Broken Authentication
EPSS: 0.031 (86.4th percentile) — read the EPSS interpretation.
Affected products
- Ntp — versions 4.2.0, 4.2.2, 4.2.4p1
- N/a — versions n/a
Weakness classification (CWE)
Public proof-of-concept exploits
References
- secalert@redhat.com (x_refsource_CONFIRM)
- secalert@redhat.com (mailing-list, x_refsource_BUGTRAQ)
- secalert@redhat.com (vdb-entry, x_refsource_SECTRACK)
- secalert@redhat.com (mailing-list, x_refsource_MLIST)
- secalert@redhat.com (x_refsource_SECUNIA, Vendor Advisory, third-party-advisory)
- secalert@redhat.com (x_refsource_REDHAT, vendor-advisory)
- secalert@redhat.com (x_refsource_SECUNIA, Vendor Advisory, third-party-advisory)
- secalert@redhat.com (vendor-advisory, x_refsource_APPLE)
- secalert@redhat.com (x_refsource_SECUNIA, Vendor Advisory, third-party-advisory)
- secalert@redhat.com (vendor-advisory, x_refsource_SUSE)
Frequently asked questions
- What is CVE-2009-0021?
- CVE-2009-0021 is a vulnerability in Ntp, classified under Improper Authentication. Published 2009-01-07.
- Is CVE-2009-0021 known to be exploited?
- 2 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.