Bug 475474 (CVE-2008-5374)

Summary: CVE-2008-5374 bash: Insecure temporary file use in aliasconv.sh, aliasconv.bash, cshtobash (symlink attack)
Product: [Other] Security Response Reporter: Jan Lieskovsky <jlieskov>
Component: vulnerabilityAssignee: Red Hat Product Security <security-response-team>
Status: CLOSED ERRATA QA Contact:
Severity: low Docs Contact:
Priority: low    
Version: unspecifiedCC: fnadge, mhusnain, mjc, psplicha, rrakus, twaugh
Target Milestone: ---Keywords: Security
Target Release: ---   
Hardware: All   
OS: Linux   
URL: http://uvw.ru/report.sid.txt
Whiteboard:
Fixed In Version: Doc Type: Bug Fix
Doc Text:
Story Points: ---
Clone Of: Environment:
Last Closed: 2011-07-21 14:28:36 UTC Type: ---
Regression: --- Mount Type: ---
Documentation: --- CRM:
Verified Versions: Category: ---
oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
Embargoed:
Bug Depends On: 657500, 700157    
Bug Blocks:    

Description Jan Lieskovsky 2008-12-09 12:28:25 UTC 
Common Vulnerabilities and Exposures assigned an identifier CVE-2008-5374 to
the following vulnerability:

bash-doc 3.2 allows local users to overwrite arbitrary files via a
symlink attack on a /tmp/cb#####.? temporary file, related to the (1)
aliasconv.sh, (2) aliasconv.bash, and (3) cshtobash scripts.

References:
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2008-5374
http://lists.debian.org/debian-devel/2008/08/msg00347.html
http://uvw.ru/report.sid.txt

Affected files:
/usr/share/doc/bash-3.1/misc/aliasconv.bash
/usr/share/doc/bash-3.1/misc/aliasconv.sh
/usr/share/doc/bash-3.1/misc/cshtobash

Sample affected code:

 10 trap 'rm -f /tmp/cb$$.?' 0 1 2 3 6 15
 11 
 12 T=$'\t'
 13 
 14 cat << \EOF >/tmp/cb$$.1


 36 $BASH /tmp/cb$$.1 | sed -e 's/\$cwd/\$PWD/g' \
 37                      -e 's/\$term/\$TERM/g' \

Problem: A malicious user could pre-create symbolic link with target to
any system file. Subsequent running of above scripts would truncate its
content.

If these files does not needed to be shipped within the bash
package, remove them, or apply fix via 'mktemp'.
Comment 1 Jan Lieskovsky 2008-12-09 12:30:01 UTC 
This issue affects all versions of the bash package, as shipped with
Red Hat Enterprise Linux 2.1, 3, 4 or 5.

This issue affects all versions of the bash package, as shipped with
Fedora releases 8, 9 and 10.
Comment 2 Jan Lieskovsky 2008-12-09 12:38:42 UTC 
Statement:

This issue has been addressed in Red Hat Enterprise Linux 4 via RHSA-2011:0261 advisory. This issue has been addressed in Red Hat Enterprise Linux 5 via RHSA-2011:1073 advisory.
Comment 10 errata-xmlrpc 2011-02-16 14:29:58 UTC 
This issue has been addressed in following products:

  Red Hat Enterprise Linux 4

Via RHSA-2011:0261 https://rhn.redhat.com/errata/RHSA-2011-0261.html
Comment 15 errata-xmlrpc 2011-07-21 10:37:10 UTC 
This issue has been addressed in following products:

  Red Hat Enterprise Linux 5

Via RHSA-2011:1073 https://rhn.redhat.com/errata/RHSA-2011-1073.html
Comment 16 errata-xmlrpc 2011-07-21 12:10:22 UTC 
This issue has been addressed in following products:

  Red Hat Enterprise Linux 5

Via RHSA-2011:1073 https://rhn.redhat.com/errata/RHSA-2011-1073.html