CVE-2017-9445

Published: 27 June 2017

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.

Notes

I believe this was introduced in v223 by
https://github.com/systemd/systemd/commit/a0166609f782da91710dea9183d1bf138538db37
systemd-resolved is not used by default in Xenial. It is
spawned if a user execs the systemd-resolve utility, but that shouldn't
impact the system.

Priority

High

CVSS 3 base score: 7.5

Status

References

• https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2017-9445
• https://ubuntu.com/security/notices/USN-3341-1
• NVD
• Launchpad
• Debian

Bugs

• https://launchpad.net/bugs/1695546