LDAP NULL pointer dereference

Open Source Vulnerabilities CVE-2018-1000121

A NULL pointer dereference exists in curl 7.21.0 to and including curl 7.58.0 in the LDAP code that allows an attacker to cause a denial of service

Open Source Vulnerabilities CURL-CVE-2018-1000121

curl might dereference a near-NULL address when getting an LDAP URL. The function `ldap_get_attribute_ber()` is called to get attributes, but it turns out that it can return `LDAP_SUCCESS` and still return a `NULL` pointer in the result pointer when getting a particularly crafted response. This was a surprise to us and to the code. libcurl-using applications that allow LDAP URLs, or that allow redirects to LDAP URLs could be made to crash by a malicious server.