Title: KDE KSSL NULL Character CA SSL Certificate Validation Security Bypass Vulnerability
Severity: CRITICAL
Description:
KDE is a graphical desktop environment for Linux and Unix computers.
The application is prone to a security-bypass vulnerability because it fails to properly validate the domain name in a signed CA certificate. Specifically, the application stops reading the domain name when it encounters a NULL character. However, an attacker can acquire a legitimate certificate for a subdomain that contains a NULL character. Such a subdomain may look like 'example.net\0example.com' where the attacker owns 'example.com' and wishes to impersonate 'example.net'.
Successfully exploiting this issue allows attackers to perform man-in-the-middle attacks or impersonate trusted servers, which will aid in further attacks.
KDE 3.5.4 is known to be vulnerable. Other versions may be affected as well.
NOTE: This issue may be related to the issue described in BID 35888 (Mozilla NSS NULL Character CA SSL Certificate Validation Security Bypass Vulnerability). We will update this BID when more information becomes available.
Affected Products:
- KDE KDE 3.5.4
- Pardus Linux 2008
- RedHat Fedora 10
- RedHat Fedora 11
- Ubuntu Ubuntu Linux 8.04 LTS amd64
- Ubuntu Ubuntu Linux 8.04 LTS i386
- Ubuntu Ubuntu Linux 8.04 LTS lpia
- Ubuntu Ubuntu Linux 8.04 LTS powerpc
- Ubuntu Ubuntu Linux 8.04 LTS sparc
- Ubuntu Ubuntu Linux 8.10 amd64
- Ubuntu Ubuntu Linux 8.10 i386
- Ubuntu Ubuntu Linux 8.10 lpia
- Ubuntu Ubuntu Linux 8.10 powerpc
- Ubuntu Ubuntu Linux 8.10 sparc
- Ubuntu Ubuntu Linux 9.04 amd64
- Ubuntu Ubuntu Linux 9.04 i386
- Ubuntu Ubuntu Linux 9.04 lpia
- Ubuntu Ubuntu Linux 9.04 powerpc
- Ubuntu Ubuntu Linux 9.04 sparc
References:
- CVE: CVE-2009-2702
- KDE: KDE Homepage
- Red Hat: CVE-2009-2702 kdelibs: kssl incorrect verification of SSL certificate with NU...
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