The deref_parseCtrl function in servers/slapd/overlays/deref.c in OpenLDAP 2.4.13 through 2.4.40 allows remote attackers to cause a denial of service (NULL pointer dereference and crash) via an empty attribute list in a deref control in a search request.
{
"binaries": [
{
"binary_version": "2.4.31-1+nmu2ubuntu8.1",
"binary_name": "ldap-utils"
},
{
"binary_version": "2.4.31-1+nmu2ubuntu8.1",
"binary_name": "libldap-2.4-2"
},
{
"binary_version": "2.4.31-1+nmu2ubuntu8.1",
"binary_name": "libldap2-dev"
},
{
"binary_version": "2.4.31-1+nmu2ubuntu8.1",
"binary_name": "slapd"
},
{
"binary_version": "2.4.31-1+nmu2ubuntu8.1",
"binary_name": "slapd-smbk5pwd"
}
],
"availability": "No subscription required"
}