oss-security - CVE Request - Quassel IRC SQL injection

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Date: Wed, 9 Oct 2013 18:48:01 +0200
From: Bas Pape <baspape@...il.com>
To: oss-security@...ts.openwall.com
Subject: CVE Request - Quassel IRC SQL injection

Hi all,

Please assign a CVE to the following issue:
Quassel IRC is vulnerable to SQL injection on all current versions
(0.9.0 being the latest at the time of writing), if used with Qt 4.8.5
(the vulnerability is caused by a change in its postgres driver[1,2])
and PostgreSQL 8.2 or later with standard_conforming_strings enabled
(which is the default in those versions). The vulnerability allows
anyone to trick the core into executing SQL queries, which includes
cascade deleting the entire database. It is tracked upstream in bug
#1244 [3]. It was firstly noticed by due to minor issues with
migration to postgres and problems with certain messages, a simple
test with an unmodified installation of postgres and quassel showed
that it was indeed possible to drop tables.

No upstream fix is available at this time, although the below patch
does fix the current issue.

Regards,
Bas Pape (Tucos)

[1] https://qt.gitorious.org/qt/qtbase/commit/e3c5351d06ce8a12f035cd0627356bc64d8c334a
[2] https://bugreports.qt-project.org/browse/QTBUG-30076
[3] http://bugs.quassel-irc.org/issues/1244

commit 7c64ed0d05718d907770d11a38436aa4ed65f2bb
Author: Bas Pape <baspape@...il.com>
Date:   Mon Oct 7 19:51:52 2013 +0200

    Detect the need for standard_conforming_strings.

diff --git a/src/core/postgresqlstorage.cpp b/src/core/postgresqlstorage.cpp
index 3965704..70bf894 100644
--- a/src/core/postgresqlstorage.cpp
+++ b/src/core/postgresqlstorage.cpp
@@ -101,6 +101,15 @@ void PostgreSqlStorage::initDbSession(QSqlDatabase &db)
     // this blows... but unfortunately Qt's PG driver forces us to this...
     db.exec("set standard_conforming_strings = off");
     db.exec("set escape_string_warning = off");
+
+    // Fortunately things can always blow more. Refer to the commit message for
+    // the juicy details, tread lightly.
+    // First standard_conforming_strings are turned off, because
that's what used
+    // to be necessary, here the actual behaviour is tested.
+    QSqlQuery query = db.exec("SELECT '\\\\' x");
+    if (query.first())
+        if (query.value(0).toString() == "\\")
+            db.exec("set standard_conforming_strings = on");
 }

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