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ksh-20120801-19.el7.x86_64 reproduces the issue as well


+++ This bug was initially created as a clone of Bug #1133582 +++

Description of problem:

The behavior regarding command substitution while stdout closed has changed between ksh-20120801 and ksh-20100621

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

ksh-20120801-10.el6_5.8.x86_64

How reproducible:

Always

Steps to Reproduce:
1.
# ksh -c 'a=`cd;pwd`;echo $a>/tmp/a' >&-;cat /tmp/a

2.
3.

Actual results:

no output

Expected results:

/root

Additional info:

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://rhn.redhat.com/errata/RHBA-2015-0300.html