Bug 1516922 (CVE-2017-15118)

Summary: CVE-2017-15118 Qemu: stack buffer overflow in NBD server triggered via long export name
Product: [Other] Security Response Reporter: Adam Mariš <amaris>
Component: vulnerabilityAssignee: Red Hat Product Security <security-response-team>
Status: CLOSED ERRATA QA Contact:
Severity: high Docs Contact:
Priority: high    
Version: unspecifiedCC: ailan, amit, apevec, areis, berrange, bmcclain, cfergeau, chayang, chrisw, coli, drjones, dwmw2, imammedo, itamar, jen, jjoyce, jschluet, juzhang, knoel, lhh, lkundrak, lpeer, markmc, mburns, mkenneth, mrezanin, mst, ngu, pbonzini, ppandit, rbryant, rjones, sclewis, security-response-team, slinaber, srevivo, tdecacqu, virt-maint, virt-maint, vkuznets, xen-maint, ykaul
Target Milestone: ---Keywords: Security
Target Release: ---   
Hardware: All   
OS: Linux   
Whiteboard:
Fixed In Version: qemu 2.11 Doc Type: Bug Fix
Doc Text:
A stack-based buffer overflow vulnerability was found in NBD server implementation in qemu allowing a client to request an export name of size up to 4096 bytes, which in fact should be limited to 256 bytes, allowing causing an out-of-bounds stack write in the qemu process. If NBD server requires TLS, the attacker cannot trigger the buffer overflow without first successfully negotiating TLS.
 Story Points: ---
Clone Of: Environment:
Last Closed: 2021-10-27 10:53:50 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: 1516545, 1517756, 1518235, 1518236, 1518548, 1525813    
Bug Blocks: 1516923    
Attachments:
Description Flags
Proposed patch none

Description Adam Mariš 2017-11-23 15:03:14 UTC 
A stack-based buffer overflow vulnerability was found in NBD server implementation in qemu allowing client to request an export name of size up to 4096 bytes, which in fact should be limited to 256 bytes, allowing to cause out-of-bounds stack write in qemu process.

If NBD server requires TLS, the attacker cannot trigger the buffer overflow without first successfully negotiating TLS.

Upstream patch:
---------------
  -> https://lists.gnu.org/archive/html/qemu-devel/2017-11/msg05045.html

Reference:
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  -> http://www.openwall.com/lists/oss-security/2017/11/28/8
Comment 1 Adam Mariš 2017-11-23 15:03:17 UTC 
Acknowledgments:

Name: Eric Blake (Red Hat)
Comment 2 Adam Mariš 2017-11-23 15:27:45 UTC 
Created attachment 1358264 [details]
Proposed patch
Comment 3 Adam Mariš 2017-11-23 15:29:13 UTC 
Issue was introduced by commit:

https://git.qemu.org/?p=qemu.git;a=commit;h=f37708f6b8 (qemu 2.10)
Comment 6 Prasad Pandit 2017-11-28 13:23:24 UTC 
Created qemu tracking bugs for this issue:

Affects: epel-7 [bug 1518236]
Affects: fedora-all [bug 1518235]
Comment 9 errata-xmlrpc 2018-04-10 18:58:08 UTC 
This issue has been addressed in the following products:

  Red Hat Virtualization 4 for RHEL-7

Via RHSA-2018:1104 https://access.redhat.com/errata/RHSA-2018:1104