CVE-2016-7796

Public Exploit

Description

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.

Category

5.5
CVSS
Severity: Medium
CVSS 3.0 •
CVSS 2.0 •
EPSS 0.34%
Vendor Advisory opensuse.org Vendor Advisory redhat.com Vendor Advisory opensuse.org Vendor Advisory redhat.com Vendor Advisory github.com
Affected: n/a n/a
Published at:
Updated at:

References

Link Tags
http://www.openwall.com/lists/oss-security/2016/09/30/1 third party advisory mailing list
https://www.agwa.name/blog/post/how_to_crash_systemd_in_one_tweet exploit third party advisory technical description
https://github.com/systemd/systemd/issues/4234#issuecomment-250441246 exploit patch vendor advisory
http://lists.opensuse.org/opensuse-security-announce/2016-10/msg00015.html third party advisory vendor advisory
https://bugzilla.redhat.com/show_bug.cgi?id=1381911 issue tracking vdb entry third party advisory
http://rhn.redhat.com/errata/RHSA-2017-0003.html vendor advisory
http://lists.opensuse.org/opensuse-security-announce/2016-10/msg00016.html third party advisory vendor advisory
http://www.securitytracker.com/id/1037320 vdb entry
http://www.securityfocus.com/bid/93250 vdb entry third party advisory
https://rhn.redhat.com/errata/RHBA-2015-2092.html third party advisory vendor advisory

Frequently Asked Questions

What is the severity of CVE-2016-7796?
CVE-2016-7796 has been scored as a medium severity vulnerability.
How to fix CVE-2016-7796?
To fix CVE-2016-7796, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2016-7796 being actively exploited in the wild?
It is possible that CVE-2016-7796 is being exploited or will be exploited in a near future based on public information. According to its EPSS score, there is a ~0% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
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