Improper Input Validation Affecting systemd package, versions <229-4ubuntu11
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Start learning- Snyk IDSNYK-UBUNTU1604-SYSTEMD-305067
- published13 Oct 2016
- disclosed13 Oct 2016
Introduced: 13 Oct 2016
CVE-2016-7796 (opens in a new tab)How to fix?
Upgrade Ubuntu:16.04 systemd to version 229-4ubuntu11 or higher.
NVD Description
Note: Versions mentioned in the description apply only to the upstream systemd package and not the systemd package as distributed by Ubuntu.
See How to fix? for Ubuntu:16.04 relevant fixed versions and status.
The manager_dispatch_notify_fd function in systemd allows local users to cause a denial of service (system hang) via a zero-length message received over a notify socket, which causes an error to be returned and the notification handler to be disabled.
References
- http://people.ubuntu.com/~ubuntu-security/cve/CVE-2016-7796
- https://security-tracker.debian.org/tracker/CVE-2016-7796
- https://github.com/systemd/systemd/issues/4234#issuecomment-250441246
- https://www.agwa.name/blog/post/how_to_crash_systemd_in_one_tweet
- http://lists.opensuse.org/opensuse-security-announce/2016-10/msg00015.html
- http://lists.opensuse.org/opensuse-security-announce/2016-10/msg00016.html
- http://www.openwall.com/lists/oss-security/2016/09/30/1
- https://bugzilla.redhat.com/show_bug.cgi?id=1381911
- http://rhn.redhat.com/errata/RHSA-2017-0003.html
- https://rhn.redhat.com/errata/RHBA-2015-2092.html
- http://www.securityfocus.com/bid/93250
- http://www.securitytracker.com/id/1037320