Bug 1729931 (CVE-2019-10638)
| Summary: | CVE-2019-10638 Kernel: net: weak IP ID generation leads to remote device tracking | ||
|---|---|---|---|
| Product: | [Other] Security Response | Reporter: | Marian Rehak <mrehak> |
| Component: | vulnerability | Assignee: | Red Hat Product Security <security-response-team> |
| Status: | CLOSED ERRATA | QA Contact: | |
| Severity: | low | Docs Contact: | |
| Priority: | low | ||
| Version: | unspecified | CC: | acaringi, airlied, bhu, blc, brdeoliv, bskeggs, dhoward, dvlasenk, esammons, fhrbata, hdegoede, hkrzesin, iboverma, ichavero, itamar, jarodwilson, jeremy, jforbes, jglisse, jlelli, john.j5live, jonathan, josef, jross, jshortt, jstancek, jwboyer, kernel-maint, kernel-mgr, labbott, lgoncalv, linville, matt, mchehab, mcressma, mjg59, mlangsdo, nmurray, pdwyer, plougher, ppandit, rt-maint, rvrbovsk, steved, williams |
| Target Milestone: | --- | Keywords: | Security |
| Target Release: | --- | ||
| Hardware: | All | ||
| OS: | Linux | ||
| Whiteboard: | |||
| Fixed In Version: | Doc Type: | Bug Fix | |
| Doc Text: |
A flaw was found in the way the Linux kernel derived the IP ID field from a partial kernel space address returned by a net_hash_mix() function. A remote user could observe a weak IP ID generation in this field to track Linux devices.
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Story Points: | --- |
| Clone Of: | Environment: | ||
| Last Closed: | 2019-11-06 00:53:07 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: | 1718503, 1729932, 1733067, 1733068, 1733069, 1733070, 1733071 | ||
| Bug Blocks: | 1729937 | ||
Created kernel tracking bugs for this issue: Affects: fedora-all [bug 1729932] External References: https://arxiv.org/pdf/1906.10478.pdf Statement: This issue does not affect the versions of Linux kernel as shipped with Red Hat Enterprise Linux 5 and Red Hat Enterprise Linux 6. This issue affects the version of Linux kernel as shipped with Red Hat Enterprise Linux 7, 8 and Red Hat Enterprise MRG 2. Future kernel updates for Red Hat Enterprise Linux 7, 8 and Red Hat Enterprise MRG 2 may address this issue. This issue has been addressed in the following products: Red Hat Enterprise Linux 8 Via RHSA-2019:3309 https://access.redhat.com/errata/RHSA-2019:3309 This issue has been addressed in the following products: Red Hat Enterprise Linux 8 Via RHSA-2019:3517 https://access.redhat.com/errata/RHSA-2019:3517 This bug is now closed. Further updates for individual products will be reflected on the CVE page(s): https://access.redhat.com/security/cve/cve-2019-10638 This issue has been addressed in the following products: Red Hat Enterprise Linux 7 Via RHSA-2020:1016 https://access.redhat.com/errata/RHSA-2020:1016 This issue has been addressed in the following products: Red Hat Enterprise Linux 7 Via RHSA-2020:1070 https://access.redhat.com/errata/RHSA-2020:1070 |
When IP packet fragmentation is ON, IP Identification(ID) field of the IP header is used, during packet reassembly on the destination host, to identify fragments which belong to the same packet. IP ID field is required to be unique and same across all fragments of an IP packet. IP packet fragments are identified by a tuple with following fields (source address|destination address|protocol|IP-ID) The Linux kernel derived this IP ID field from partial kernel space address returned by net_hash_mix() function, which is then used with a hash function to compute the IP ID field. A remote user could observe this IP ID field to deduce the hash key used to derive its value. This could enable a remote user to track particular Linux devices. Upstream fix: ------------- -> https://git.kernel.org/linus/df453700e8d81b1bdafdf684365ee2b9431fb702 Issue introduced by: -------------------- -> https://git.kernel.org/linus/b6a7719aedd7e5c0f2df7641aa47386111682df4 -> https://git.kernel.org/linus/5a352dd0a3aac03b443c94828dfd7144261c8636