Secunia Research: Adobe Reader for Linux Insecure Temporary File Creation

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                     Secunia Research 29/06/2005

      - Adobe Reader for Linux Insecure Temporary File Creation -

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Table of Contents

Affected Software....................................................1
Severity.............................................................2
Vendor's Description of Software.....................................3
Description of Vulnerability.........................................4
Solution.............................................................5
Time Table...........................................................6
Credits..............................................................7
References...........................................................8
About Secunia........................................................9
Verification........................................................10

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1) Affected Software 

Adobe Reader 5.0.10 for Linux.

NOTE: Other versions may also be affected.

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2) Severity 

Rating: Less critical 
Impact: Exposure of sensitive information
Where:  Local System

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3) Vendor's Description of Software 

"Adobe Reader is free software that allows everyone from business
professionals to home users to easily and reliably view, print, and
search PDF files using a variety of platforms and devices."

Product Link:
http://www.adobe.com/products/acrobat/readermain.html

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4) Description of Vulnerability

Secunia has discovered a security issue in Adobe Reader for Linux,
which can be exploited by malicious, local users to gain knowledge
of sensitive information.

The problem is caused due to temporary files being created with 
permissions based on a user's umask in the "/tmp" folder under
certain circumstances when documents are opened.

Example:
[test1@ts1 tmp]$ pwd
/tmp
[test1@ts1 tmp]$ ll A*
-rw-rw-r--  1 test1  test1   2048000 Apr  5 12:10 Acro0waWth
-rw-rw-r--  1 test3  test3         0 Apr  7 11:59 AcrodftfSw
-rw-rw-r--  1 test1  test1       338 Apr 13 15:17 AcroDLk9ED
-rw-rw-r--  1 test2  test2   2048000 Apr 13 15:18 AcroDVxpj7
-rw-rw-r--  1 test2  test2   2048000 Apr  8 12:13 AcrojCjK46
-rw-rw-r--  1 test3  test3   2048000 Apr 14 12:51 AcrolXvRGr
-rw-rw-r--  1 test1  test1   2048000 Apr 12 13:20 AcroMRcjtB

Successful exploitation allows an unprivileged user to read arbitrary
users' documents.

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5) Solution 

Update to version 7.0 or later for Linux.

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6) Time Table 

11/05/2005 - Vendor notified.
11/05/2005 - Vendor response.
21/06/2005 - Vendor final response.
29/06/2005 - Public disclosure.

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7) Credits 

Discovered by Carsten Eiram, Secunia Research.

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8) References

The Common Vulnerabilities and Exposures (CVE) project has assigned 
candidate number CAN-2005-1912 for the vulnerability.

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9) About Secunia 

Secunia collects, validates, assesses, and writes advisories regarding 
all the latest software vulnerabilities disclosed to the public. These 
advisories are gathered in a publicly available database at the 
Secunia website: 

http://secunia.com/

Secunia offers services to our customers enabling them to receive all 
relevant vulnerability information to their specific system 
configuration. 

Secunia offers a FREE mailing list called Secunia Security Advisories: 

http://secunia.com/secunia_security_advisories/

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10) Verification 

Please verify this advisory by visiting the Secunia website:
http://secunia.com/secunia_research/2005-6/

Complete list of vulnerability reports published by Secunia Research:
http://secunia.com/secunia_research/

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