CVE-2009-4028

Severity: medium (CVSS 6.8 v2.0)
Exploited in the wild: not listed in CISA KEV
EPSS: 1.8% probability of exploitation in the next 30 days
Public exploit or detection template: yes
Published: 2009-11-30 · updated 2026-06-16
Weakness: CWE-20

Description

The vio_verify_callback function in viosslfactories.c in MySQL 5.0.x before 5.0.88 and 5.1.x before 5.1.41, when OpenSSL is used, accepts a value of zero for the depth of X.509 certificates, which allows man-in-the-middle attackers to spoof arbitrary SSL-based MySQL servers via a crafted certificate, as demonstrated by a certificate presented by a server linked against the yaSSL library.

Affected products

Mysql: through 5.0.87; 5.0.0, 5.0.1, 5.0.2, 5.0.3, 5.0.4, 5.0.5 (+23)
MySQL Server: 5.0.0-alpha, 5.0.3-beta, 5.0.6, 5.0.7, 5.0.8, 5.0.11 (+68)

References

http://bugs.mysql.com/47320
http://dev.mysql.com/doc/refman/5.0/en/news-5-0-88.html
http://dev.mysql.com/doc/refman/5.1/en/news-5-1-41.html
http://lists.mysql.com/commits/87446
http://lists.opensuse.org/opensuse-security-announce/2010-05/msg00001.html
http://marc.info/?l=oss-security&m=125881733826437&w=2
http://www.openwall.com/lists/oss-security/2009/11/19/3
http://www.openwall.com/lists/oss-security/2009/11/23/16
http://www.redhat.com/support/errata/RHSA-2010-0109.html
http://www.vupen.com/english/advisories/2010/1107
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A10940
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A8510

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