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Bug 1230118 - Possible security escalation in spice-server
Summary: Possible security escalation in spice-server
Keywords:
Status: CLOSED DUPLICATE of bug 1233238
Alias: None
Product: Red Hat Enterprise Linux 7
Classification: Red Hat
Component: spice
Version: 7.3
Hardware: All
OS: Linux
medium
medium
Target Milestone: rc
: 7.3
Assignee: Default Assignee for SPICE Bugs
QA Contact: SPICE QE bug list
URL:
Whiteboard:
Depends On:
Blocks: CVE-2015-3247
TreeView+ depends on / blocked
 
Reported: 2015-06-10 09:40 UTC by Frediano Ziglio
Modified: 2015-09-07 15:59 UTC (History)
7 users (show)

Fixed In Version:
Doc Type: Bug Fix
Doc Text:
Clone Of:
Environment:
Last Closed: 2015-09-07 14:23:36 UTC
Target Upstream Version:
Embargoed:


Attachments (Terms of Use)
proposed patch (4.78 KB, patch)
2015-06-10 09:41 UTC, Frediano Ziglio
no flags Details | Diff

Description Frediano Ziglio 2015-06-10 09:40:13 UTC
Description of problem:
Function worker_update_monitors_config in spice-server contains a race condition which can be exploited as a heap corruption from the guest


Version-Release number of selected component (if applicable):
All

How reproducible:
Send a monitor configs with small monitors than increse monitor numbers from another cpu inside the guest

Steps to Reproduce:
Got no reproduction but is easy to prove the possible memory corruption.


Actual results:
Memory corruption.


Expected results:
No memory corruption.


Additional info:
Agreed by spice team this is a security risk.

Comment 1 Frediano Ziglio 2015-06-10 09:41:27 UTC
Created attachment 1037193 [details]
proposed patch

Comment 3 Uri Lublin 2015-06-10 15:42:05 UTC
Also, the patch protects memory access by calling get_virt the second
time to protect access to 'count' heads (instead of a single head before).

Comment 9 Christophe Fergeau 2015-07-23 19:34:10 UTC
I guess this bug could be marked as a duplicate of rhbz#1239128 ?

Comment 10 Stefan Cornelius 2015-09-07 14:23:36 UTC

*** This bug has been marked as a duplicate of bug 1233238 ***


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