Bug 1764925 (CVE-2019-14865)
| Summary: | CVE-2019-14865 grub2: grub2-set-bootflag utility causes grubenv corruption rendering the system non-bootable | ||||||||
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| Product: | [Other] Security Response | Reporter: | Dhananjay Arunesh <darunesh> | ||||||
| Component: | vulnerability | Assignee: | Red Hat Product Security <security-response-team> | ||||||
| Status: | CLOSED ERRATA | QA Contact: | |||||||
| Severity: | medium | Docs Contact: | |||||||
| Priority: | medium | ||||||||
| Version: | unspecified | CC: | bootloader-eng-team, fmartine, hdegoede, huzaifas, javierm, jstodola, lkundrak, pjanda, pjones, security-response-team | ||||||
| Target Milestone: | --- | Keywords: | Security | ||||||
| Target Release: | --- | ||||||||
| Hardware: | All | ||||||||
| OS: | Linux | ||||||||
| Whiteboard: | |||||||||
| Fixed In Version: | Doc Type: | If docs needed, set a value | |||||||
| Doc Text: |
A flaw was found in the grub2-set-bootflag utility of grub2. A local attacker could run this utility under resource pressure (for example by setting RLIMIT), causing grub2 configuration files to be truncated and leaving the system unbootable on subsequent reboots.
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Story Points: | --- | ||||||
| Clone Of: | Environment: | ||||||||
| Last Closed: | 2020-02-04 14:09:46 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: | 1772866, 1776580, 1778887 | ||||||||
| Bug Blocks: | 1764926 | ||||||||
| Attachments: |
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Description
Dhananjay Arunesh
2019-10-24 04:50:22 UTC
Acknowledgments: Name: Tavis Ormandy Statement: grub-set-bootflag is a command line to set bootflags in GRUB's stored environment. This is a downstream utility which is shipped with Red Hat Enterprise Linux 8 and Fedora. A flaw was found in this application which would could allow a local attacker (someone having a local account on the system) to cause grub configuration files to be truncated. Whenever the machine was rebooted, grub would fail to read the configuration files and the system would be rendered unbootable. Mitigation: Remove the "grub-set-bootflag" from the system, by manually the deleting the binary file. Note: On subsequent updates of the "grub2-tools-minimal" rpm, the file will be re-installed. Created attachment 1639336 [details]
Patch-1
Created attachment 1639337 [details]
Patch-2
Created grub2 tracking bugs for this issue: Affects: fedora-all [bug 1776580] External References: https://seclists.org/oss-sec/2019/q4/101 This issue has been addressed in the following products: Red Hat Enterprise Linux 8 Via RHSA-2020:0335 https://access.redhat.com/errata/RHSA-2020:0335 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-2019-14865 |