The int_x509_param_set_hosts function in lib/libcrypto/x509/x509_vpm.c in LibreSSL 2.7.0 before 2.7.1 does not support a certain special case of a zero name length, which causes silent omission of hostname verification, and consequently allows man-in-the-middle attackers to spoof servers and obtain sensitive information via a crafted certificate. NOTE: the LibreSSL documentation indicates that this special case is supported, but the BoringSSL documentation does not.
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Suse | — | Upgrade libresslUpgrade libcrypto43-32bitUpgrade libtls17-debuginfo-32bitUpgrade libressl-develUpgrade libtls17-32bitUpgrade libssl45Upgrade libcrypto43-debuginfo-32bitUpgrade libssl45-32bitUpgrade libssl45-debuginfoUpgrade libtls17Upgrade libressl-devel-docUpgrade libressl-debuginfoUpgrade libressl-debugsourceUpgrade libtls17-debuginfoUpgrade libressl-devel-32bitUpgrade libcrypto43-debuginfoUpgrade libssl45-debuginfo-32bitUpgrade libcrypto43 | Sep 4, 2018 | Mar 24, 2018 |
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