Bug 1735655 (CVE-2015-9289)

Summary: CVE-2015-9289 kernel: out of bound read in DVB connexant driver.
Product: [Other] Security Response Reporter: Dhananjay Arunesh <darunesh>
Component: vulnerabilityAssignee: Red Hat Product Security <security-response-team>
Status: CLOSED ERRATA QA Contact:
Severity: medium Docs Contact:
Priority: medium    
Version: unspecifiedCC: acaringi, airlied, apmukher, asavkov, bhu, blc, brdeoliv, bskeggs, dhoward, dvlasenk, esammons, fhrbata, hdegoede, hkrzesin, iboverma, ichavero, itamar, jarodwilson, jeremy, jforbes, jglisse, jlelli, john.j5live, jonathan, josef, jpoimboe, jross, jshortt, jstancek, jwboyer, kernel-maint, kernel-mgr, labbott, lgoncalv, linville, matt, mchehab, mcressma, mjg59, mlangsdo, mschmidt, nmurray, plougher, rhandlin, rt-maint, rvrbovsk, 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 vulnerability was found in the Linux kernel’s CX24116 tv-card driver, where an out of bounds read occurs when checking userspace params in drivers/media/dvb-frontends/cx24116.c. An attacker could use this flaw to leak kernel private information to userspace.
Story Points: ---
Clone Of: Environment:
Last Closed: 2020-03-31 22:35:14 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: 1735656, 1737277, 1737278, 1737279, 1737280, 1737281, 1753279    
Bug Blocks: 1735657    

Description Dhananjay Arunesh 2019-08-01 08:12:56 UTC
A vulnerability was found in Linux Kernel, an out-of-bounds read occurs when checking userspace params in drivers/media/dvb-frontends/cx24116.c. The maximum size for a DiSEqC command is 6, according to the userspace API. However, the code allows larger values such as 23.


This was originally classfied as a buffer-overflow but it is not.  It has been reclassified as a possible information leak.

Reference:
https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=1fa2337a315a2448c5434f41e00d56b01a22283c
https://github.com/torvalds/linux/commit/1fa2337a315a2448c5434f41e00d56b01a22283c
https://mirrors.edge.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.1.4

Comment 1 Dhananjay Arunesh 2019-08-01 08:13:28 UTC
Created kernel tracking bugs for this issue:

Affects: fedora-all [bug 1735656]

Comment 2 Justin M. Forbes 2019-08-01 12:46:10 UTC
This was fixed in stable kernel 4.1.4 and has never impacted any currently supported Fedora release.

Comment 5 Wade Mealing 2019-08-02 07:33:23 UTC
Statement: 

This flaw requires a Conexant CX24116 series TV-media card to be in the system for this driver to load.  This flaw is when an attacker attempts to use the card to communicate with a satellite tv control subsystem ( via Digital Satellite Equipment Control command) by issuing a specially crafted ioctl to the device.

Comment 6 Wade Mealing 2019-08-05 01:02:08 UTC
This flaw is rated as moderate because this attack vector could allow a local attacker to leak kernel-internal information to  userspace.

Comment 12 Wade Mealing 2019-12-09 05:36:46 UTC
Note to any customers following along:

I had originally misundertood this flaw, I apologise for any confusion.  The impact and description has been modified to reflect my new understanding of this issue.

Comment 13 errata-xmlrpc 2020-03-31 19:11:56 UTC
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 7

Via RHSA-2020:1016 https://access.redhat.com/errata/RHSA-2020:1016

Comment 14 errata-xmlrpc 2020-03-31 19:21:04 UTC
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 7

Via RHSA-2020:1070 https://access.redhat.com/errata/RHSA-2020:1070

Comment 15 Product Security DevOps Team 2020-03-31 22:35:14 UTC
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-2015-9289