CA certificate check bypass with X509_V_FLAG_X509_STRICT

The X509_V_FLAG_X509_STRICT flag enables additional security checks of the certificates present in a certificate chain. It is not set by default. Starting from OpenSSL version 1.1.1h a check to disallow certificates in the chain that have explicitly encoded elliptic curve parameters was added as an additional strict check. An error in the implementation of this check meant that the result of a previous check to confirm that certificates in the chain are valid CA certificates was overwritten. This effectively bypasses the check that non-CA certificates must not be able to issue other certificates. If a "purpose" has been configured then there is a subsequent opportunity for checks that the certificate is a valid CA. All of the named "purpose" values implemented in libcrypto perform this check. Therefore, where a purpose is set the certificate chain will still be rejected even when the strict flag has been used. A purpose is set by default in libssl client and server certificate verification routines, but it can be overridden or removed by an application. In order to be affected, an application must explicitly set the X509_V_FLAG_X509_STRICT verification flag and either not set a purpose for the certificate verification or, in the case of TLS client or server applications, override the default purpose. OpenSSL versions 1.1.1h and newer are affected by this issue. Users of these versions should upgrade to OpenSSL 1.1.1k. OpenSSL 1.0.2 is not impacted by this issue. Fixed in OpenSSL 1.1.1k (Affected 1.1.1h-1.1.1j).

ICMP information such as (1) netmask and (2) timestamp is allowed from arbitrary hosts.

SQL injection vulnerability in directory.php in Super Link Exchange Script 1.0 might allow remote attackers to execute arbitrary SQL queries via the cat parameter.

Ezboo webstats, possibly 3.0.3, allows remote attackers to bypass authentication and gain access via a direct request to (1) update.php and (2) config.php.

formmail.php in Jetbox CMS 2.1 allows remote attackers to send arbitrary e-mails (spam) via modified recipient, _SETTINGS[allowed_email_hosts][], and subject parameters.

PHP remote file inclusion vulnerability in index.php in Achievo 1.1.0 allows remote attackers to execute arbitrary PHP code via a URL in the config_atkroot parameter.

Heap-based buffer overflow in libmpdemux/aviheader.c in MPlayer 1.0rc1 and earlier allows remote attackers to cause a denial of service (application crash) or possibly execute arbitrary code via a .avi file with certain large "indx truck size" and nEntriesInuse values, and a certain wLongsPerEntry value.

Cross-site scripting (XSS) vulnerability in index.php in FTP Admin 0.1.0 allows remote attackers to inject arbitrary web script or HTML via the error parameter in an error page action.

security flaw

Buffer overflow in Sendmail 5.79 to 8.12.7 allows remote attackers to execute arbitrary code via certain formatted address fields, related to sender and recipient header comments as processed by the crackaddr function of headers.c.