7.5 High
CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
5 Medium
CVSS2
Access Vector
NETWORK
Access Complexity
LOW
Authentication
NONE
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
PARTIAL
AV:N/AC:L/Au:N/C:N/I:N/A:P
0.001 Low
EPSS
Percentile
46.0%
Internally libssl in OpenSSL calls X509_verify_cert() on the client side to
verify a certificate supplied by a server. That function may return a negative
return value to indicate an internal error (for example out of memory). Such a
negative return value is mishandled by OpenSSL and will cause an IO function
(such as SSL_connect() or SSL_do_handshake()) to not indicate success and a
subsequent call to SSL_get_error() to return the value
SSL_ERROR_WANT_RETRY_VERIFY. This return value is only supposed to be returned
by OpenSSL if the application has previously called
SSL_CTX_set_cert_verify_callback(). Since most applications do not do this the
SSL_ERROR_WANT_RETRY_VERIFY return value from SSL_get_error() will be totally
unexpected and applications may not behave correctly as a result. The exact
behaviour will depend on the application but it could result in crashes,
infinite loops or other similar incorrect responses.
This issue is made more serious in combination with a separate bug in OpenSSL
3.0 that will cause X509_verify_cert() to indicate an internal error when
processing a certificate chain. This will occur where a certificate does not
include the Subject Alternative Name extension but where a Certificate Authority
has enforced name constraints. This issue can occur even with valid chains.
By combining the two issues an attacker could induce incorrect, application
dependent behaviour.
OpenSSL 3.0.0 SSL/TLS clients are affected by this issue.
7.5 High
CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
5 Medium
CVSS2
Access Vector
NETWORK
Access Complexity
LOW
Authentication
NONE
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
PARTIAL
AV:N/AC:L/Au:N/C:N/I:N/A:P
0.001 Low
EPSS
Percentile
46.0%