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...
Status: NEW
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: impact=low,public=20180919,reported=2...
Keywords: Security
Depends On: 1661641 1661643 1663085 1661642 1663086
Blocks: 1661644
TreeView+ depends on / blocked
 
Reported: 2018-12-21 20:31 UTC by Laura Pardo
Modified: 2019-06-14 09:14 UTC (History)
5 users (show)

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Last Closed:


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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.


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