[原文]Integer overflow in the stralloc_readyplus function in qmail, when running on 64 bit platforms with a large amount of virtual memory, allows remote attackers to cause a denial of service and possibly execute arbitrary code via a large SMTP request.
A remote overflow exists in qmail when running on 64 bit platforms with 8 GB virtual memory or more. The 'stralloc_readyplus()' function fails to perform proper bounds checking resulting in an integer overflow. With a specially crafted request, a remote attacker can cause the SMTP service to crash resulting in a loss of availability.
Currently, there are no known upgrades, patches, or workarounds available to correct this issue.