Bug 1434327 (CVE-2017-7187)

Summary: CVE-2017-7187 kernel: scsi: Stack-based buffer overflow in sg_ioctl function
Product: [Other] Security Response Reporter: Andrej Nemec <anemec>
Component: vulnerabilityAssignee: Red Hat Product Security <security-response-team>
Status: CLOSED ERRATA QA Contact:
Severity: medium Docs Contact:
Priority: medium    
Version: unspecifiedCC: aquini, bhu, dhoward, fhrbata, gansalmon, hwkernel-mgr, iboverma, ichavero, itamar, jcm, jforbes, jkacur, jonathan, jross, jwboyer, kernel-maint, kernel-mgr, labbott, lgoncalv, madhu.chinakonda, matt, mchehab, mcressma, nmurray, pholasek, plougher, rt-maint, rvrbovsk, vdronov, 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:
The sg_ioctl function in drivers/scsi/sg.c in the Linux kernel allows local users to cause a denial of service (stack-based buffer overflow) or possibly have unspecified other impacts via a large command size in an SG_NEXT_CMD_LEN ioctl call, leading to out-of-bounds write access in the sg_write function.
Story Points: ---
Clone Of: Environment:
Last Closed: 2019-06-08 03:09:17 UTC Type: ---
Regression: --- Mount Type: ---
Documentation: --- CRM:
Verified Versions: Category: ---
oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
Bug Depends On: 1439043, 1439044, 1439045, 1439046, 1439047, 1439048, 1439049    
Bug Blocks: 1434328    

Description Andrej Nemec 2017-03-21 09:54:33 UTC
The sg_ioctl function in drivers/scsi/sg.c in the Linux kernel allows local users to cause a denial of service (stack-based buffer overflow) or possibly have unspecified other impact via a large command size in an SG_NEXT_CMD_LEN ioctl call, leading to out-of-bounds write access in the sg_write function.

Upstream patch:

https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=bf33f87dd04c371ea33feb821b60d63d754e3124

References:

https://gist.github.com/dvyukov/48ad14e84de45b0be92b7f0eda20ff1b

Comment 2 Wade Mealing 2017-04-05 05:55:52 UTC
Created kernel tracking bugs for this issue:

Affects: fedora-all [bug 1439045]

Comment 4 Wade Mealing 2017-04-05 06:20:34 UTC
Statement:

This issue does not affect the Linux kernel packages as shipped with Red Hat Enterprise Linux 5, 6, as the change that introduced the flaw is not present in the code of these products. 

This issue affects the Linux kernel packages as shipped with Red Hat Enterprise Linux 7 and MRG-2.  Future Linux kernel updates for the respective releases may address this issue.

Comment 6 errata-xmlrpc 2017-08-01 19:14:30 UTC
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 7

Via RHSA-2017:2077 https://access.redhat.com/errata/RHSA-2017:2077

Comment 7 errata-xmlrpc 2017-08-02 07:54:42 UTC
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 7

Via RHSA-2017:1842 https://access.redhat.com/errata/RHSA-2017:1842

Comment 8 errata-xmlrpc 2017-09-06 20:40:47 UTC
This issue has been addressed in the following products:

  Red Hat Enterprise MRG 2

Via RHSA-2017:2669 https://access.redhat.com/errata/RHSA-2017:2669