Bug 1757358 (CVE-2017-18552)

Summary:	CVE-2017-18552 kernel: OOB read and write in net/rds/af_rds.c
Product:	[Other] Security Response	Reporter:	Dhananjay Arunesh <darunesh>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED NOTABUG	QA Contact:
Severity:	medium	Docs Contact:
Priority:	medium
Version:	unspecified	CC:	acaringi, airlied, bdettelb, bhu, blc, brdeoliv, bskeggs, dhoward, dominik.mierzejewski, dvlasenk, esammons, fhrbata, hdegoede, hkrzesin, iboverma, ichavero, itamar, jarodwilson, jeremy, jforbes, jglisse, jlelli, john.j5live, jonathan, josef, jross, jschorr, jshortt, jstancek, jwboyer, kernel-maint, kernel-mgr, labbott, lgoncalv, linville, masami256, matt, mchehab, mcressma, mjg59, mlangsdo, nmurray, plougher, rt-maint, rvrbovsk, steved, williams, wmealing
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:		Doc Type:	If docs needed, set a value
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2020-05-06 10:56:16 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:	1757359
Bug Blocks:	1757360

Description Dhananjay Arunesh 2019-10-01 10:27:19 UTC

An issue was discovered in RDS protocol in the Linux kernel. There is an out of bounds write and read in the function rds_recv_track_latency which may allow an attacker with a local account to corrupt memory or escalate privileges.  

No Red Hat Enterprise Linux versions ship the affected code at this time.

Reference:
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=780e982905bef61d13496d9af5310bf4af3a64d3

Comment 1 Dhananjay Arunesh 2019-10-01 10:27:52 UTC

Created kernel tracking bugs for this issue:

Affects: fedora-all [bug 1757359]

Comment 2 Justin M. Forbes 2019-10-01 13:43:21 UTC

This was fixed in the 4.11 kernel and has never impacted any release of Fedora which is currently supported.

Comment 5 Wade Mealing 2020-02-17 04:40:16 UTC

Mitigation:


As the RDS module will be auto-loaded when required, its use can be disabled  by preventing the module from loading with the following instructions:

# echo "install rds /bin/true" >> /etc/modprobe.d/disable-rds.conf 
 
The system will need to be restarted if the RDS modules are loaded. In most circumstances, the RDS kernel modules will be unable to be unloaded while any network interfaces are active and the protocol is in use.

If the system requires this module to work correctly, this mitigation may not be suitable.

If you need further assistance, see KCS article https://access.redhat.com/solutions/41278 or contact Red Hat Global Support Services.