The idnsGrokReply function in Squid before 3.1.16 does not properly
free memory, which allows remote attackers to cause a denial of
service (daemon abort) via a DNS reply containing a CNAME record that
references another CNAME record that contains an empty A record.
Note:References are provided for the convenience of the reader to help distinguish between vulnerabilities. The list is not intended to be complete.
MLIST:[oss-security] 20111031 CVE Request -- Squid v3.1.16 -- Invalid free by processing CNAME DNS record pointing to another CNAME record pointing to an empty A-record
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