Bug 1475236 (CVE-2017-2838)

Summary: CVE-2017-2838 freerdp: Rdp Client License Read Product Info Denial of Service
Product: [Other] Security Response Reporter: Adam Mariš <amaris>
Component: vulnerabilityAssignee: Red Hat Product Security <security-response-team>
Status: CLOSED WONTFIX QA Contact:
Severity: low Docs Contact:
Priority: low    
Version: unspecifiedCC: mads, negativo17, oholy, pahan, pokorra.mailinglists
Target Milestone: ---Keywords: Security
Target Release: ---   
Hardware: All   
OS: Linux   
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Last Closed: 2017-08-07 13:59:06 UTC Type: ---
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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
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Bug Depends On: 1475245, 1475246, 1475247    
Bug Blocks: 1475243    

Description Adam Mariš 2017-07-26 09:16:54 UTC 
An exploitable denial of service vulnerability exists within the handling of challenge packets in FreeRDP 2.0.0-beta1+android11. A specially crafted challenge packet can cause the program termination leading to a denial of service condition. An attacker can compromise the server or use man in the middle to trigger this vulnerability.

The vulnerability is located in the license read product info handling. A malicious crafted packet may cause the application to crash. The vulnerable code reads in an unsigned integer from the server message which then incremented by four as part of a length check. However, the size of the unsigned integer is never validated and thus the addition of four could cause an overflow and result in the client crashing.

External References:

https://www.talosintelligence.com/vulnerability_reports/TALOS-2017-0340
http://blog.talosintelligence.com/2017/07/vulnerbility-spotlight-freerdp-multiple.html
Comment 1 Adam Mariš 2017-07-26 09:31:30 UTC 
Created freerdp tracking bugs for this issue:

Affects: epel-6 [bug 1475247]
Affects: fedora-all [bug 1475246]


Created freerdp1.2 tracking bugs for this issue:

Affects: fedora-all [bug 1475245]
Comment 2 Stefan Cornelius 2017-07-27 14:27:47 UTC 
Patch:
https://github.com/FreeRDP/FreeRDP/pull/4055/commits/8292b4558f0684065ce1f58db7783cc426099223
Comment 3 Stefan Cornelius 2017-08-07 13:59:14 UTC 
Statement:

Red Hat Product Security has rated this issue as having Low security impact. This issue is not currently planned to be addressed in future updates. For additional information, refer to the Issue Severity Classification: https://access.redhat.com/security/updates/classification/.