Bug 1822077 (CVE-2020-12826)
| Summary: | CVE-2020-12826 kernel: possible to send arbitrary signals to a privileged (suidroot) parent process | ||
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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: | acaringi, airlied, bhu, blc, bmasney, brdeoliv, bskeggs, carnil, dhoward, dvlasenk, esammons, fhrbata, hdegoede, hkrzesin, iboverma, ichavero, itamar, jarodwilson, jeremy, jforbes, jglisse, jlelli, john.j5live, jonathan, josef, jross, jshortt, jstancek, jwboyer, kcarcia, kernel-maint, kernel-mgr, lgoncalv, linville, masami256, matt, mchehab, mcressma, mjg59, mlangsdo, nmurray, ptalbert, qzhao, rt-maint, rvrbovsk, security-response-team, steved, williams, wmealing, yozone |
| 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 Linux kernel loose validation of child/parent process identification handling while filtering signal handlers. A local attacker is able to abuse this flaw to bypass checks to send any signal to a privileged process.
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Story Points: | --- |
| Clone Of: | Environment: | ||
| Last Closed: | 2020-09-29 22:00:31 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: | 1834649, 1834650, 1834651, 1834652, 1834653, 1834654 | ||
| Bug Blocks: | 1818051 | ||
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Comment 2
Wade Mealing
2020-05-12 02:05:32 UTC
Acknowledgments: Name: Adam Zabrocki This flaw is rated as moderate, this may trigger a fault or possibly dos but there isnt a known memory corruption/privesc Created kernel tracking bugs for this issue: Affects: fedora-all [bug 1834649] External References: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=d1e7fd6462ca9fc76650fbe6ca800e35b24267da https://lists.openwall.net/linux-kernel/2020/03/24/1803 https://www.openwall.com/lists/kernel-hardening/2020/03/25/1 This was fixed for Fedora with the 5.5.18 stable kernel updates. This seems to be a duplicate of https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-12826 . FWIW, issued via cveform.mitre.org a question on that to MITRE as well. In reply to comment #12: > This seems to be a duplicate of > https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-12826 . > > FWIW, issued via cveform.mitre.org a question on that to MITRE as well. thank you. CVE-2020-10741 was rejected in favor of CVE-2020-12826. I added CVE-2020-12826 as a CVE alias for this bug. *** PLEASE NOTE *** CVE-2020-10741 was rejected as per https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-10741 and CVE-2020-12826 should be used instead. based on that CVE-2020-10741 has been removed from this bug. *** PLEASE NOTE *** Mitigation: Mitigation for this issue is either not available or the currently available options don't meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability. This issue has been addressed in the following products: Red Hat Enterprise Linux 7 Via RHSA-2020:4062 https://access.redhat.com/errata/RHSA-2020:4062 This issue has been addressed in the following products: Red Hat Enterprise Linux 7 Via RHSA-2020:4060 https://access.redhat.com/errata/RHSA-2020:4060 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-2020-12826 This issue has been addressed in the following products: Red Hat Enterprise Linux 8 Via RHSA-2020:4431 https://access.redhat.com/errata/RHSA-2020:4431 This issue has been addressed in the following products: Red Hat Enterprise Linux 8 Via RHSA-2020:4609 https://access.redhat.com/errata/RHSA-2020:4609 |