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vulnerability CVE-2012-6093

Qt: incorrect error report of QSslSocket

Synthesis of the vulnerability

When Qt is used with an OpenSSL version which is different from the version it was compiled with, and when a SSL certificate is invalid, the QSslSocket::sslErrors() function returns an incorrect error code/message, which can deceive the user.
Impacted products: Fedora, openSUSE, Unix (platform).
Severity: 2/4.
Creation date: 04/01/2013.
Identifiers: BID-57162, CVE-2012-6093, FEDORA-2013-0199, FEDORA-2013-0270, FEDORA-2013-0277, openSUSE-SU-2013:0204-1, openSUSE-SU-2013:0211-1, openSUSE-SU-2013:0256-1, VIGILANCE-VUL-12285.

Description of the vulnerability

The QSslSocket class of Qt implements the support of SSL/TLS. The OpenSSL library is used to provide the low level features.

The QSslSocket::sslErrors() function indicates errors which occur during a SSL session. This function directly uses the "error" field from the OpenSSL X509_STORE_CTX structure. However, between OpenSSL version 0.9 and 1.0, the layout of the X509_STORE_CTX structure was changed, and the "error" field is not located at the same place. Its value is thus incoherent.

When Qt is used with an OpenSSL version which is different from the version it was compiled with, and when a SSL certificate is invalid, the QSslSocket::sslErrors() function therefore returns an incorrect error code/message, which can deceive the user.
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