Bug 1552048 (CVE-2018-1068)
| Summary: | CVE-2018-1068 kernel: Out-of-bounds write via userland offsets in ebt_entry struct in netfilter/ebtables.c | ||
|---|---|---|---|
| Product: | [Other] Security Response | Reporter: | Pedro Sampaio <psampaio> |
| Component: | vulnerability | Assignee: | Red Hat Product Security <security-response-team> |
| Status: | CLOSED ERRATA | QA Contact: | |
| Severity: | high | Docs Contact: | |
| Priority: | high | ||
| Version: | unspecified | CC: | airlied, ajax, aquini, bhu, blc, bskeggs, carnil, dhoward, ewk, fhrbata, hdegoede, hkrzesin, hwkernel-mgr, iboverma, ichavero, itamar, jarodwilson, jforbes, jglisse, jkacur, john.j5live, jonathan, josef, jross, jwboyer, kernel-maint, kernel-mgr, labbott, lgoncalv, linville, matt, mchehab, mcressma, mjg59, mlangsdo, mmilgram, nmurray, plougher, ppandit, rt-maint, rvrbovsk, security-response-team, skozina, slawomir, steved, vdronov, williams, yozone |
| Target Milestone: | --- | Keywords: | Security |
| Target Release: | --- | ||
| Hardware: | All | ||
| OS: | Linux | ||
| Whiteboard: | |||
| Fixed In Version: | kernel-3.10.0-862.1.1.el7 | Doc Type: | If docs needed, set a value |
| Doc Text: |
A flaw was found in the Linux kernel's implementation of 32-bit syscall interface for bridging. This allowed a privileged user to arbitrarily write to a limited range of kernel memory.
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Story Points: | --- |
| Clone Of: | Environment: | ||
| Last Closed: | 2019-06-10 10:16:27 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: | 1552364, 1552365, 1552366, 1552367, 1552368, 1552369, 1552370, 1557238, 1557239, 1695814, 1725182 | ||
| Bug Blocks: | 1551689 | ||
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Description
Pedro Sampaio
2018-03-06 12:06:52 UTC
Notes:
The related permission check in the kernel code is as follows:
[ net/bridge/netfilter/ebtables.c ]
static int compat_do_ebt_set_ctl(struct sock *sk, ...
{
...
if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
return -EPERM;
This mean that this flaw can be exploited not only by a system's privileged user (a real "root" user), but also by an attacker who is a privileged user (a "root" user) in a user+network namespace, for example, on some container hosting. So, the impact of this flaw is rated as Important.
Created kernel tracking bugs for this issue: Affects: fedora-all [bug 1557238] kernel-4.15.10-200.fc26 has been pushed to the Fedora 26 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 7 Via RHSA-2018:1318 https://access.redhat.com/errata/RHSA-2018:1318 This issue has been addressed in the following products: Red Hat Enterprise Linux 7 Via RHSA-2018:1355 https://access.redhat.com/errata/RHSA-2018:1355 This issue has been addressed in the following products: Red Hat Enterprise Linux 7 Via RHSA-2018:2948 https://access.redhat.com/errata/RHSA-2018:2948 This issue has been addressed in the following products: Red Hat Enterprise Linux 7.4 Extended Update Support Via RHSA-2019:1170 https://access.redhat.com/errata/RHSA-2019:1170 This issue has been addressed in the following products: Red Hat Enterprise MRG 2 Via RHSA-2019:1190 https://access.redhat.com/errata/RHSA-2019:1190 This issue has been addressed in the following products: Red Hat Enterprise Linux 7.3 Telco Extended Update Support Red Hat Enterprise Linux 7.3 Advanced Update Support Red Hat Enterprise Linux 7.3 Update Services for SAP Solutions Via RHSA-2019:4159 https://access.redhat.com/errata/RHSA-2019:4159 |