Incorrect Check of Function Return Value Affecting systemd-resolved package, versions <0:219-19.el7
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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Test your applications- Snyk IDSNYK-RHEL7-SYSTEMDRESOLVED-4964876
- published26 Jul 2021
- disclosed28 Sept 2016
Introduced: 28 Sep 2016
CVE-2016-7796 (opens in a new tab)How to fix?
Upgrade RHEL:7 systemd-resolved to version 0:219-19.el7 or higher.
This issue was patched in RHBA-2015:2092.
NVD Description
Note: Versions mentioned in the description apply only to the upstream systemd-resolved package and not the systemd-resolved package as distributed by RHEL.
See How to fix? for RHEL:7 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://www.securityfocus.com/bid/93250
- https://bugzilla.redhat.com/show_bug.cgi?id=1381911
- https://github.com/systemd/systemd/issues/4234#issuecomment-250441246
- https://access.redhat.com/security/cve/CVE-2016-7796
- https://www.agwa.name/blog/post/how_to_crash_systemd_in_one_tweet
- http://www.openwall.com/lists/oss-security/2016/09/30/1
- http://rhn.redhat.com/errata/RHSA-2017-0003.html
- https://rhn.redhat.com/errata/RHBA-2015-2092.html
- https://access.redhat.com/errata/RHBA-2015:2092
- http://www.securitytracker.com/id/1037320
- http://lists.opensuse.org/opensuse-security-announce/2016-10/msg00015.html
- http://lists.opensuse.org/opensuse-security-announce/2016-10/msg00016.html