Cryptographic issues in ProFTPD - CVE-2009-3639
Published: August 17, 2017 / Updated: June 23, 2025
Vulnerability identifier: #VU111812
CSH Severity: Medium
CVSS v4: 6.9 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:L/SC:N/SI:N/SA:N]
CVE-ID: CVE-2009-3639
CWE-ID: CWE-310
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote non-authenticated attacker to manipulate or delete data.
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 ' ' 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.
Affected software
ProFTPD
Fedora
proftpd
Fedora
proftpd
How to mitigate CVE-2009-3639
Install update from vendor's website.
ProFTPD - update to 1.3.3
proftpd - update to 1.3.2b-1.el5
proftpd - update to 1.3.2b-1.el5
External References
- http://bugs.proftpd.org/show_bug.cgi?id=3275
- http://marc.info/?l=oss-security&m=125630966510672&w=2
- http://marc.info/?l=oss-security&m=125632960508211&w=2
- http://secunia.com/advisories/37131
- http://secunia.com/advisories/37219
- http://www.debian.org/security/2009/dsa-1925
- http://www.mandriva.com/security/advisories?name=MDVSA-2009:288
- http://www.securityfocus.com/bid/36804
- https://bugzilla.redhat.com/show_bug.cgi?id=530719
- https://exchange.xforce.ibmcloud.com/vulnerabilities/53936
- https://www.redhat.com/archives/fedora-package-announce/2009-November/msg00642.html
- https://www.redhat.com/archives/fedora-package-announce/2009-November/msg00649.html