Bug 1299442 (CVE-2015-8138)
| Summary: | CVE-2015-8138 ntp: missing check for zero originate timestamp | ||
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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: | high | Docs Contact: | |
| Priority: | high | ||
| Version: | unspecified | CC: | carnil, mlichvar, sardella, security-response-team, slawomir |
| Target Milestone: | --- | Keywords: | Security |
| Target Release: | --- | ||
| Hardware: | All | ||
| OS: | Linux | ||
| Whiteboard: | |||
| Fixed In Version: | Doc Type: | Bug Fix | |
| Doc Text: |
It was discovered that ntpd as a client did not correctly check the originate timestamp in received packets. A remote attacker could use this flaw to send a crafted packet to an ntpd client that would effectively disable synchronization with the server, or push arbitrary offset/delay measurements to modify the time on the client.
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Story Points: | --- |
| Clone Of: | Environment: | ||
| Last Closed: | 2016-01-25 13:51:33 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: | 1299457, 1299458, 1299459, 1299460, 1300277 | ||
| Bug Blocks: | 1297474 | ||
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Description
Martin Prpič
2016-01-18 11:53:33 UTC
External References: http://support.ntp.org/bin/view/Main/SecurityNotice#January_2016_NTP_4_2_8p6_Securit http://www.talosintel.com/reports/TALOS-2016-0077/ Created ntp tracking bugs for this issue: Affects: fedora-all [bug 1300277] Statement: This issue did not affect the versions of ntp as shipped with Red Hat Enterprise Linux 5 as they do not include the affected code, which was introduced in version 4.2.6 of NTP. The upstream fix for this issue is reported to be incomplete: http://bugs.ntp.org/show_bug.cgi?id=2945#c7 http://lists.ntp.org/pipermail/hackers/2016-January/007406.html (In reply to Martin Prpic from comment #8) > The upstream fix for this issue is reported to be incomplete: > > http://bugs.ntp.org/show_bug.cgi?id=2945#c7 > http://lists.ntp.org/pipermail/hackers/2016-January/007406.html Clarification: The patch proposed by upstream has been found not address the CVE-2015-8138 issue because it doesn't apply with a fix that was applied for a different issue. The problematic upstream merge is: https://github.com/ntp-project/ntp/commit/5e16a06fa7dea9fcbfc1b2fc3cba0d2629171e80#diff-3b84eda3a15fdd99dcf77a2d85423721L1331 Red Hat has not included the patch to fix the previous issue and used a slightly modified version of the upstream patch to fix CVE-2015-8138. This issue has been addressed in the following products: Red Hat Enterprise Linux 6 Red Hat Enterprise Linux 7 Via RHSA-2016:0063 https://rhn.redhat.com/errata/RHSA-2016-0063.html 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. |