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Bug 1203712 (CVE-2015-2922)
| Summary: | CVE-2015-2922 kernel: denial of service (DoS) attack against IPv6 network stacks due to improper handling of Router Advertisements. | ||||||
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| Product: | [Other] Security Response | Reporter: | Vasyl Kaigorodov <vkaigoro> | ||||
| Component: | vulnerability | Assignee: | Red Hat Product Security <security-response-team> | ||||
| Status: | CLOSED ERRATA | QA Contact: | |||||
| Severity: | low | Docs Contact: | |||||
| Priority: | low | ||||||
| Version: | unspecified | CC: | aquini, bhu, carnil, ccoleman, dhoward, dmcphers, fhrbata, iboverma, jialiu, joelsmith, jokerman, jross, kernel-mgr, lmeyer, matt, mcressma, mmccomas, nmurray, plougher, ppandit, rvrbovsk, security-response-team, spider, williams, wmealing | ||||
| Target Milestone: | --- | Keywords: | Security | ||||
| Target Release: | --- | ||||||
| Hardware: | All | ||||||
| OS: | Linux | ||||||
| Whiteboard: | |||||||
| Fixed In Version: | Doc Type: | Bug Fix | |||||
| Doc Text: |
It was found that the Linux kernel's TCP/IP protocol suite implementation for IPv6 allowed the Hop Limit value to be set to a smaller value than the default one. An attacker on a local network could use this flaw to prevent systems on that network from sending or receiving network packets.
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Story Points: | --- | ||||
| Clone Of: | Environment: | ||||||
| Last Closed: | 2019-06-08 02:40:06 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: | 1208496, 1208491, 1208492, 1208493, 1208494, 1208498, 1209410, 1209411, 1210172, 1210173 | ||||||
| Bug Blocks: | |||||||
| Attachments: |
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Description
Vasyl Kaigorodov
2015-03-19 14:03:03 UTC
Created attachment 1003851 [details]
linux-3.18-ipv6-hop_limit.patch
In the attachment there is a patch for the Linux kernel that fixes this issue. Other suggested mitigations: * Disallowing Router Advertisements on a Switch level (RA filtering) * Dropping Router Advertisements that do not contain a network/route * Dropping Router Advertisements with short hop limits (hop limit < 40 or similar) Other interesting combinations is to send "route removal" packet (timeout = 0 ) in combination. Reported found that it isn't necessary, but most code paths will then delete the route if it finds it, even if it's not getting the "drop route" message from the host that advertised the route. Statement: This issue affects the versions of the Linux kernel as shipped with Red Hat Enterprise Linux 5, 6, 7 and Red Hat Enterprise MRG 2. Future kernel updates for Red Hat Enterprise Linux 5, 6, 7 and Red Hat Enterprise MRG 2 may address this issue. Red Hat Enterprise Linux 5 is now in Production 3 phase of the support and maintenance life cycle. This issue is not currently planned to be addressed in future updates. For additional information, refer to the Red Hat Enterprise Linux Life Cycle: https://access.redhat.com/support/policy/updates/errata/. Created kernel tracking bugs for this issue: Affects: fedora-all [bug 1208491] kernel-3.19.4-100.fc20 has been pushed to the Fedora 20 stable repository. If problems still persist, please make note of it in this bug report. kernel-3.19.4-200.fc21 has been pushed to the Fedora 21 stable repository. If problems still persist, please make note of it in this bug report. kernel-4.0.0-1.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 6 Via RHSA-2015:1221 https://rhn.redhat.com/errata/RHSA-2015-1221.html This issue has been addressed in the following products: MRG for RHEL-6 v.2 Via RHSA-2015:1564 https://rhn.redhat.com/errata/RHSA-2015-1564.html This issue has been addressed in the following products: Red Hat Enterprise Linux 7 Via RHSA-2015:1565 https://access.redhat.com/errata/RHSA-2015:1565 This issue has been addressed in the following products: Red Hat Enterprise Linux 7 Via RHSA-2015:1534 https://rhn.redhat.com/errata/RHSA-2015-1534.html |