Bug 1610555 (CVE-2018-15471)

Summary: CVE-2018-15471 kernel: net: xen: Linux netback driver OOB access in hash handling (XSA-270)
Product: [Other] Security Response Reporter: Laura Pardo <lpardo>
Component: vulnerabilityAssignee: Red Hat Product Security <security-response-team>
Status: CLOSED NOTABUG QA Contact:
Severity: high Docs Contact:
Priority: high    
Version: unspecifiedCC: ailan, airlied, aquini, bhu, blc, bskeggs, dhoward, drjones, esammons, ewk, fhrbata, hdegoede, hkrzesin, hwkernel-mgr, iboverma, ichavero, imammedo, itamar, jarodwilson, jforbes, jglisse, jkacur, john.j5live, jonathan, josef, jross, jstancek, jwboyer, kernel-maint, kernel-mgr, knoel, labbott, lgoncalv, linville, lwang, matt, m.a.young, mchehab, mcressma, mjg59, mlangsdo, mrezanin, nmurray, pbonzini, plougher, rkrcmar, robinlee.sysu, rt-maint, rvrbovsk, security-response-team, skozina, steved, vdronov, vkuznets, williams, wmealing, xen-maint
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 in the netback module allowed frontends to control mapping of requests to request queues. An attacker can change this mapping by requesting invalid mapping requests allowing the (usually privileged) backend to access out-of-bounds memory access for reading and writing.
 Story Points: ---
Clone Of: Environment:
Last Closed: 2018-08-30 09:06:26 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: 1618413, 1618414    
Bug Blocks: 1610556    

Description Laura Pardo 2018-07-31 22:05:59 UTC 
Linux's netback driver allows frontends to control mapping of requests to request queues. When processing a request to set or change this mapping, some input validation was missing or flawed. A malicious or buggy frontend may cause the (usually privileged) backend to make out of bounds memory accesses, potentially resulting in one or more of privilege escalation, Denial of Service (DoS), or information leaks.

Red Hat Enterprise Linux 5 is the only supported version of Red Hat Enterprise Linux that ships with Xen support, and does not include the relevant build time configuration that would enable this code to be included.

Additional information:

Xen security advisory - https://xenbits.xen.org/xsa/advisory-270.html
Comment 3 Laura Pardo 2018-08-16 14:59:41 UTC 
Created kernel tracking bugs for this issue:

Affects: fedora-all [bug 1618414]


Created xen tracking bugs for this issue:

Affects: fedora-all [bug 1618413]