Bug 1879981 (CVE-2020-25643)
| Summary: | CVE-2020-25643 kernel: improper input validation in ppp_cp_parse_cr function leads to memory corruption and read overflow | ||
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| Product: | [Other] Security Response | Reporter: | Guilherme de Almeida Suckevicz <gsuckevi> |
| 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, 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, mchehab, mcressma, mjg59, mlangsdo, nmurray, ptalbert, qzhao, rt-maint, rvrbovsk, security-response-team, steved, williams |
| Target Milestone: | --- | Keywords: | Security |
| Target Release: | --- | ||
| Hardware: | All | ||
| OS: | Linux | ||
| Whiteboard: | |||
| Fixed In Version: | Linux kernel 5.9-rc7 | Doc Type: | If docs needed, set a value |
| Doc Text: |
A flaw was found in the HDLC_PPP module of the Linux kernel. Memory corruption and a read overflow is caused by improper input validation in the ppp_cp_parse_cr function which can cause the system to crash or cause a denial of service. The highest threat from this vulnerability is to data confidentiality and integrity as well as system availability.
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Story Points: | --- |
| Clone Of: | Environment: | ||
| Last Closed: | 2020-12-15 22:19:01 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: | 1882078, 1882079, 1882080, 1882081, 1882082, 1883886 | ||
| Bug Blocks: | 1878235 | ||
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Description
Guilherme de Almeida Suckevicz
2020-09-17 14:01:23 UTC
Mitigation: To mitigate this issue, prevent modules hdlc_ppp, syncppp from being loaded. Please see https://access.redhat.com/solutions/41278 for how to blacklist a kernel module to prevent it from loading automatically. Created kernel tracking bugs for this issue: Affects: fedora-all [bug 1883886] This was fixed for Fedora with the 5.8.12 stable kernel updates. External References: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=66d42ed8b25b64eb63111a2b8582c5afc8bf1105 Acknowledgments: Name: ChenNan Of Chaitin (Security Research Lab) Statement: This flaw is rated as a having Moderate impact, because the bug can be triggered only if PPP protocol enabled. This issue has been addressed in the following products: Red Hat Enterprise Linux 7 Via RHSA-2020:5437 https://access.redhat.com/errata/RHSA-2020:5437 This issue has been addressed in the following products: Red Hat Enterprise Linux 7 Via RHSA-2020:5441 https://access.redhat.com/errata/RHSA-2020:5441 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-2020-25643 This issue has been addressed in the following products: Red Hat Enterprise Linux 8 Via RHSA-2021:1578 https://access.redhat.com/errata/RHSA-2021:1578 This issue has been addressed in the following products: Red Hat Enterprise Linux 8 Via RHSA-2021:1739 https://access.redhat.com/errata/RHSA-2021:1739 |