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Vulnerability Details : CVE-2009-3639

The mod_tls module in ProFTPD before 1.3.2b, and 1.3.3 before 1.3.3rc2, when the dNSNameRequired TLS option is enabled, does not properly handle a '\0' character in a domain name in the Subject Alternative Name field of an X.509 client certificate, which allows remote attackers to bypass intended client-hostname restrictions via a crafted certificate issued by a legitimate Certification Authority, a related issue to CVE-2009-2408.
Publish Date : 2009-10-28 Last Update Date : 2017-08-17
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- CVSS Scores & Vulnerability Types

CVSS Score
Confidentiality Impact None (There is no impact to the confidentiality of the system.)
Integrity Impact Partial (Modification of some system files or information is possible, but the attacker does not have control over what can be modified, or the scope of what the attacker can affect is limited.)
Availability Impact Partial (There is reduced performance or interruptions in resource availability.)
Access Complexity Medium (The access conditions are somewhat specialized. Some preconditions must be satistified to exploit)
Authentication Not required (Authentication is not required to exploit the vulnerability.)
Gained Access None
Vulnerability Type(s) Bypass a restriction or similar
CWE ID 310

- Related OVAL Definitions

Title Definition Id Class Family
DSA-1925 proftpd-dfsg -- insufficient input validation oval:org.mitre.oval:def:7684 unix
DSA-1925-1 proftpd-dfsg -- insufficient input validation oval:org.mitre.oval:def:13366 unix
OVAL (Open Vulnerability and Assessment Language) definitions define exactly what should be done to verify a vulnerability or a missing patch. Check out the OVAL definitions if you want to learn what you should do to verify a vulnerability.

- Products Affected By CVE-2009-3639

# Product Type Vendor Product Version Update Edition Language
1 Application Proftpd Proftpd * A * * Version Details Vulnerabilities
2 Application Proftpd Proftpd 1.3.1 * * * Version Details Vulnerabilities
3 Application Proftpd Proftpd 1.3.2 * * * Version Details Vulnerabilities
4 Application Proftpd Proftpd 1.3.2 RC1 * * Version Details Vulnerabilities
5 Application Proftpd Proftpd 1.3.2 RC2 * * Version Details Vulnerabilities
6 Application Proftpd Proftpd 1.3.2 RC4 * * Version Details Vulnerabilities
7 Application Proftpd Proftpd 1.3.3 RC1 * * Version Details Vulnerabilities

- Number Of Affected Versions By Product

Vendor Product Vulnerable Versions
Proftpd Proftpd 7

- References For CVE-2009-3639 CONFIRM
FEDORA FEDORA-2009-11649
MLIST [oss-security] 20091023 proftpd - mod_tls - Improper SSL/TLS certificate subjectAltName verification
FEDORA FEDORA-2009-11666
BID 36804 ProFTPD mod_tls Module NULL Character CA SSL Certificate Validation Security Bypass Vulnerability Release Date:2009-12-28 CONFIRM
MLIST [oss-security] 20091023 Re: proftpd - mod_tls - Improper SSL/TLS certificate subjectAltName verification
XF proftpd-modtls-security-bypass(53936)

- Metasploit Modules Related To CVE-2009-3639

There are not any metasploit modules related to this CVE entry (Please visit for more information)

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