Canonical informs Ubuntu users that it updated the systemd packages in the Ubuntu 16.10 (Yakkety Yak) and Ubuntu 17.04 (Zesty Zapus) operating systems to patch a recently discovered security issue.The new systemd vulnerability (CVE-2017-9445) appears to affect the systemd-resolved component, which could allow a remote attacker to crash the systemd daemon by causing a denial of service or run malicious programs on the vulnerable, unpatched machines by using a specially crafted DNS response.
"In systemd through 233, certain sizes passed to dns_packet_new in systemd-resolved can cause it to allocate a buffer that's too small. A malicious DNS server can exploit this via a response with a specially crafted TCP payload to trick systemd-resolved into allocating a buffer that's too small, and subsequently write arbitrary data beyond the end of it," reads Canonical's read more)
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