CVE-2009-0021
ntp - cryptographic weakness
EPSS 2.2%
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.
How to fix CVE-2009-0021
To remediate CVE-2009-0021, upgrade the affected package to a fixed version below.
- Debian/ntp—upgrade to 1:4.2.4p4+dfsg-8 or later
- Debian/ntp—upgrade to 1:4.2.2.p4+dfsg-2etch1 or later
Is CVE-2009-0021 being exploited?
Low — EPSS is 2.2%, meaning exploitation activity has not been observed at scale.
Affected packages (2)
- from 0, < 1:4.2.4p4+dfsg-8
- from 0, < 1:4.2.2.p4+dfsg-2etch1