Description
OpenLiteSpeed through 1.9.4 contains an authentication bypass vulnerability that allows unauthenticated remote attackers to evade virtual host client certificate requirements over HTTP/3. Because QuicStream inherits a verifyContext() implementation that always returns true, attackers can present a non-mTLS host's SNI with a protected Host header to access protected content.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| litespeedtech | openlitespeed | ≤ 1.9.4 | — |
References
- https://github.com/litespeedtech/openlitespeed/blob/v1.9.4/src/http/httpsession.cpp#L1665-L1672 technical-description
- https://github.com/litespeedtech/openlitespeed/blob/v1.9.4/src/sslpp/hiocrypto.h#L49-L50 technical-description
- https://github.com/litespeedtech/openlitespeed/blob/v1.9.4/src/quic/quicstream.h#L33-L37 technical-description
- https://abraxaslabs.tech/research/openlitespeed-h3-mtls-verifycontext third-party-advisory
- https://github.com/litespeedtech/openlitespeed product
- VulnCheck Advisory: OpenLiteSpeed through 1.9.4 mTLS Bypass via HTTP/3 SNI and Host Mismatch third-party-advisory