Current OpenSSL-1.0.1, 1.0.2 as well as state-machine-rewrite branches reject Client Hello messages bigger than 2^14+4 bytes.
RFC 5246 specifies maximum size of just the extensions field to be
2^16-1:
struct {
ProtocolVersion client_version;
Random random;
SessionID session_id;
CipherSuite cipher_suites<2..2^16-2>;
CompressionMethod compression_methods<1..2^8-1>;
select (extensions_present) {
case false:
struct {};
case true:
Extension extensions<0..2^16-1>;
};
} ClientHello;
reproducer:
openssl req -x509 -newkey rsa -keyout localhost.key -out localhost.crt\
-nodes -batch
~/dev/openssl/apps/openssl s_server -key localhost.key -cert\
localhost.crt -www
pip install --pre tlslite-ng
git clone https://github.com/tomato42/tlsfuzzer.git
cd tlsfuzzer
PYTHONPATH=. python scripts/test-record-layer-fragmentation.py
--
Regards,
Hubert Kario
Quality Engineer, QE BaseOS Security team
Web: www.cz.redhat.com
Red Hat Czech s.r.o., Purkyňova 99/71, 612 45, Brno, Czech Republic
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