Vulnerability Note VU#118748
POCO C++ Libraries NetSSL library fails to properly validate wildcard certificates
Original Release date: 24 Apr 2014 | Last revised: 24 Apr 2014

Overview
The POCO C++ Libraries NetSSL library fails to properly validate wildcard certificates, allowing an attacker to trick the victim application into trusting a malicious certificate.

Description
CWE-350: Reliance on Reverse DNS Resolution for a Security-Critical Action
Guenter Obiltschnig of Applied Informatics GmbH reports:

The Poco::Net::X509Certificate::verify() method in the POCO C++ Libraries NetSSL library fails to properly validate a wildcard certificate if DNS reverse mapping is broken. In case of a wildcard certificate, the class relies on DNS to obtain aliases for the host name, which are then used for matching against the wildcard domain name(s) in the certificate.

Stable release versions 1.4.6p2 and older are affected, as well as development release version 1.50 to 1.5.2.

Impact
After a successful DNS spoofing attack, the attacker may be able to trick a SSL/TLS client into successfully validating a certificate from a malicious server. However, this requires that the certificate first passes the certificate chain validation.

Solution
Apply an Update

Vendors and developers which incorporate the POCO C++ NetSSL library into their software should update to version 1.4.6p4 or later.

Vendor Information (Learn More)

VendorStatusDate NotifiedDate UpdatedApplied Informatics GmbHAffected-17 Apr 2014If you are a vendor and your product is affected, let
us know.

CVSS Metrics (Learn More)

Group
Score
Vector

Base
6.4
AV:N/AC:L/Au:N/C:P/I:P/A:N

Temporal
4.7
E:U/RL:OF/RC:C

Environmental
1.2
CDP:ND/TD:L/CR:ND/IR:ND/AR:ND

References

http://pocoproject.org/
http://pocoproject.org/download/index.html
https://github.com/pocoproject/

Credit

Thanks to Tuomas Siren and Alexander Berezhnoy for originally discovering the vulnerability.
This document was written by Todd Lewellen.

Other Information

CVE IDs:
CVE-2014-0350

Date Public:
24 Apr 2014

Date First Published:
24 Apr 2014

Date Last Updated:
24 Apr 2014

Document Revision:
6

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