Bug 1300271 (CVE-2015-7979)
| Summary: | CVE-2015-7979 ntp: off-path denial of service on authenticated broadcast mode | ||
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| Product: | [Other] Security Response | Reporter: | Martin Prpič <mprpic> |
| Component: | vulnerability | Assignee: | Red Hat Product Security <security-response-team> |
| Status: | CLOSED ERRATA | QA Contact: | |
| Severity: | medium | Docs Contact: | |
| Priority: | medium | ||
| Version: | unspecified | CC: | mlichvar, sardella, slawomir |
| Target Milestone: | --- | Keywords: | Reopened, Security |
| Target Release: | --- | ||
| Hardware: | All | ||
| OS: | Linux | ||
| Whiteboard: | |||
| Fixed In Version: | ntp 4.2.8p6 | Doc Type: | Bug Fix |
| Doc Text: |
It was found that when NTP was configured in broadcast mode, a remote attacker could broadcast packets with bad authentication to all clients. The clients, upon receiving the malformed packets, would break the association with the broadcast server, causing them to become out of sync over a longer period of time.
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Story Points: | --- |
| Clone Of: | Environment: | ||
| Last Closed: | 2016-05-31 08:23:22 UTC | Type: | --- |
| Regression: | --- | Mount Type: | --- |
| Documentation: | --- | CRM: | |
| Verified Versions: | Category: | --- | |
| oVirt Team: | --- | RHEL 7.3 requirements from Atomic Host: | |
| Cloudforms Team: | --- | Target Upstream Version: | |
| Embargoed: | |||
| Bug Depends On: | 1300277, 1317795, 1332478, 1332479, 1332480, 1356965 | ||
| Bug Blocks: | 1297474, 1323912 | ||
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Description
Martin Prpič
2016-01-20 11:43:24 UTC
External References: http://support.ntp.org/bin/view/Main/SecurityNotice#January_2016_NTP_4_2_8p6_Securit http://www.talosintel.com/reports/TALOS-2016-0076/ Created ntp tracking bugs for this issue: Affects: fedora-all [bug 1300277] Mitigation: Do not use NTP's broadcast mode by not configuring the "broadcast" directive in the ntp.conf file. Statement: This issue affects the versions of ntp as shipped with Red Hat Enterprise Linux 5, 6, and 7. Red Hat Product Security has rated this issue as having Moderate security impact. A future update may address this issue in Red Hat Enterprise Linux 6 and 7. For additional information, refer to the Issue Severity Classification: https://access.redhat.com/security/updates/classification/. ntp-4.2.6p5-36.fc23 has been pushed to the Fedora 23 stable repository. If problems still persist, please make note of it in this bug report. ntp-4.2.6p5-36.fc22 has been pushed to the Fedora 22 stable repository. If problems still persist, please make note of it in this bug report. This issue has been addressed in the following products: Red Hat Enterprise Linux 7 Red Hat Enterprise Linux 6 Via RHSA-2016:1141 https://access.redhat.com/errata/RHSA-2016:1141 This issue has been addressed in the following products: Red Hat Enterprise Linux 6.7 Extended Update Support Via RHSA-2016:1552 https://rhn.redhat.com/errata/RHSA-2016-1552.html This issue has been addressed in the following products: Red Hat Enterprise Linux 7 Via RHSA-2016:2583 https://rhn.redhat.com/errata/RHSA-2016-2583.html |