GCVE-110-MAGEIA-2018-31

Pali Rohar discovered that DBD::mysql constructed an error message in a fixed-length buffer, leading to a crash (_FORTIFY_SOURCE failure) and, potentially, to denial of service (CVE-2016-1246). A vulnerability was discovered in perl-DBD-MySQL that can lead to an out-of-bounds read when using server side prepared statements with an unaligned number of placeholders in WHERE condition and output fields in SELECT expression (CVE-2016-1249). There is a vulnerability of type use-after-free affecting DBD::mysql before 4.041 when used with mysql_server_prepare=1 (CVE-2016-1251). The DBD::mysql module through 4.043 for Perl allows remote attackers to cause a denial of service (use-after-free and application crash) or possibly have unspecified other impact by triggering (1) certain error responses from a MySQL server or (2) a loss of a network connection to a MySQL server. The use-after-free defect was introduced by relying on incorrect Oracle mysql_stmt_close documentation and code examples (CVE-2017-10788). The DBD::mysql module through 4.043 for Perl uses the mysql_ssl=1 setting to mean that SSL is optional (even though this setting's documentation has a "your communication with the server will be encrypted" statement), which allows man-in-the-middle attackers to spoof servers via a cleartext-downgrade attack (CVE-2017-10789). Note that the CVE-2016-1246, CVE-2017-1249, and CVE-2016-1251 issues only affected Mageia 5. Also note that server-side prepared statements are disabled by default.