Bug 1369108 (CVE-2016-6830, CVE-2016-6831)

Summary: CVE-2016-6830 CVE-2016-6831 chicken: Buffer overflow and a memory leak in the POSIX unit's procedures process-execute and process-spawn
Product: [Other] Security Response Reporter: Andrej Nemec <anemec>
Component: vulnerabilityAssignee: Red Hat Product Security <security-response-team>
Status: CLOSED CURRENTRELEASE QA Contact:
Severity: medium Docs Contact:
Priority: medium    
Version: unspecifiedCC: relrod
Target Milestone: ---Keywords: Security
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Hardware: All   
OS: Linux   
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Last Closed: 2016-08-24 10:21:46 UTC Type: ---
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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
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Bug Depends On: 1369109, 1369110    
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Description Andrej Nemec 2016-08-22 13:48:16 UTC 
A buffer overflow error was found in the POSIX unit's procedures
process-execute and process-spawn.  The code allocated a buffer
of size ARG_MAX for the argument array, and ENV_MAX for the
environment array, then copied the strings from the input lists
into that buffer *without* checking the length of the lists.

On modern Linuxen, ARG_MAX and ENV_MAX are both undefined, which
exacerbated the problem: CHICKEN would fall back to 256 for ARG_MAX
and 1024 for ENV_MAX when these were undefined.

Additionally, a memory leak existed in this code, which would be
triggered when an error is raised during argument and environment
processing (e.g., if one of the arguments wasn't a string).

References:

http://seclists.org/oss-sec/2016/q3/276
Comment 1 Andrej Nemec 2016-08-22 13:48:48 UTC 
Created chicken tracking bugs for this issue:

Affects: fedora-all [bug 1369109]
Affects: epel-all [bug 1369110]
Comment 2 Rick Elrod 2016-08-24 10:21:46 UTC 
Fix is in testing.