Bug 1661640 (CVE-2018-1000852) - CVE-2018-1000852 freerdp: out of bounds read in drdynvc_process_capability_request
Summary: CVE-2018-1000852 freerdp: out of bounds read in drdynvc_process_capability_re...
Keywords:
Status: CLOSED ERRATA
Alias: CVE-2018-1000852
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
low
low
Target Milestone: ---
Assignee: Red Hat Product Security
QA Contact:
URL:
Whiteboard:
Depends On: 1661641 1661642 1661643 1663085 1663086
Blocks: 1661644
TreeView+ depends on / blocked
 
Reported: 2018-12-21 20:31 UTC by Laura Pardo
Modified: 2019-09-29 15:04 UTC (History)
5 users (show)

Fixed In Version:
Clone Of:
Environment:
Last Closed: 2019-08-06 13:21:14 UTC
Embargoed:

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System ID Private Priority Status Summary Last Updated
Red Hat Product Errata RHSA-2019:2157 0 None None None 2019-08-06 12:22:36 UTC

Description Laura Pardo 2018-12-21 20:31:53 UTC 
FreeRDP 2.0.0-rc3 contains an out of bounds read vulnerability in drdynvc_process_capability_request function in channels/drdynvc/client/drdynvc_main.c file. To exploit this RDPClient must connect to the rdp server with the echo option. This can lead to a two-byte outbound reading from the client memory.


References:
https://github.com/FreeRDP/FreeRDP/issues/4866 

Upstream Patch:
https://github.com/FreeRDP/FreeRDP/pull/4871/commits/baee520e3dd9be6511c45a14c5f5e77784de1471
Comment 1 Laura Pardo 2018-12-21 20:32:24 UTC 
Created freerdp tracking bugs for this issue:

Affects: epel-6 [bug 1661641]
Affects: fedora-28 [bug 1661642]


Created freerdp1.2 tracking bugs for this issue:

Affects: fedora-all [bug 1661643]
Comment 2 Doran Moppert 2019-01-03 05:04:09 UTC 
The same memory disclosure seems to be present in freerdp-1.0.2, though it's contained entirely in the drdynvc_process_capability_request function.  There does not seem to be any Availability impact, as it's a small read beyond the end of a heap buffer.
Comment 5 errata-xmlrpc 2019-08-06 12:22:36 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 7

Via RHSA-2019:2157 https://access.redhat.com/errata/RHSA-2019:2157
Comment 6 Product Security DevOps Team 2019-08-06 13:21:14 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-2018-1000852
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