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Don't allow remote attacker to bypass security restrictions caused by

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flaw in certificate validation (CVE-2023-34410)

Resolves: bz#2212753
This commit is contained in:
Jan Grulich 2023-06-06 15:23:30 +02:00
parent 2757b48f73
commit c063415565
2 changed files with 39 additions and 1 deletions
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31
CVE-2023-34410-qtbase-5.15.patch Normal file
View File

@ -0,0 +1,31 @@
diff --git a/src/network/ssl/qsslsocket_schannel.cpp b/src/network/ssl/qsslsocket_schannel.cpp
index c956ce3c..86381886 100644
--- a/src/network/ssl/qsslsocket_schannel.cpp
+++ b/src/network/ssl/qsslsocket_schannel.cpp
@@ -1880,6 +1880,26 @@ bool QSslSocketBackendPrivate::verifyCertContext(CERT_CONTEXT *certContext)
if (configuration.peerVerifyDepth > 0 && DWORD(configuration.peerVerifyDepth) < verifyDepth)
verifyDepth = DWORD(configuration.peerVerifyDepth);
+ if (!rootCertOnDemandLoadingAllowed()
+ && !(chain->TrustStatus.dwErrorStatus & CERT_TRUST_IS_PARTIAL_CHAIN)
+ && (q->peerVerifyMode() == QSslSocket::VerifyPeer
+ || (isClient && q->peerVerifyMode() == QSslSocket::AutoVerifyPeer))) {
+ // When verifying a peer Windows "helpfully" builds a chain that
+ // may include roots from the system store. But we don't want that if
+ // the user has set their own CA certificates.
+ // Since Windows claims this is not a partial chain the root is included
+ // and we have to check that it is one of our configured CAs.
+ CERT_CHAIN_ELEMENT *element = chain->rgpElement[chain->cElement - 1];
+ QSslCertificate certificate = getCertificateFromChainElement(element);
+ if (!caCertificates.contains(certificate)) {
+ auto error = QSslError(QSslError::CertificateUntrusted, certificate);
+ sslErrors += error;
+ emit q->peerVerifyError(error);
+ if (q->state() != QAbstractSocket::ConnectedState)
+ return false;
+ }
+ }
+
for (DWORD i = 0; i < verifyDepth; i++) {
CERT_CHAIN_ELEMENT *element = chain->rgpElement[i];
QSslCertificate certificate = getCertificateFromChainElement(element);

9
qt5-qtbase.spec
View File

@ -41,7 +41,7 @@ BuildRequires: pkgconfig(libsystemd)
Name: qt5-qtbase
Summary: Qt5 - QtBase components
Version: 5.15.3
Release: 2%{?dist}
Release: 3%{?dist}
# See LGPL_EXCEPTIONS.txt, for exception details
License: LGPLv2 with exceptions or GPLv3 with exceptions
@ -127,6 +127,7 @@ Source100: kde-5.15-rollup-20220324.patch.gz
Patch110: CVE-2023-32762-qtbase-5.15.patch
Patch111: CVE-2023-32763-qtbase-5.15.patch
Patch112: CVE-2023-33285-qtbase-5.15.patch
Patch113: CVE-2023-34410-qtbase-5.15.patch
# Do not check any files in %%{_qt5_plugindir}/platformthemes/ for requires.
# Those themes are there for platform integration. If the required libraries are
@ -388,6 +389,7 @@ Qt5 libraries used for drawing widgets and OpenGL items.
%patch110 -p1
%patch111 -p1
%patch112 -p1
%patch113 -p1
# move some bundled libs to ensure they're not accidentally used
pushd src/3rdparty
@ -1062,6 +1064,11 @@ fi
%changelog
* Tue Jun 06 2023 Jan Grulich <jgrulich@redhat.com> - 5.15.3-3
- Don't allow remote attacker to bypass security restrictions caused by
flaw in certificate validation (CVE-2023-34410)
Resolves: bz#2212753
* Wed May 24 2023 Jan Grulich <jgrulich@redhat.com> - 5.15.3-2
- Fix specific overflow in qtextlayout
- Fix incorrect parsing of the strict-transport-security (HSTS) header