Bug 40400 - man 1.5h1-10 has an exploitable overflow
man 1.5h1-10 has an exploitable overflow
Status: CLOSED ERRATA
Product: Red Hat Linux
Classification: Retired
Component: man (Show other bugs)
7.0
i386 Linux
medium Severity medium
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Assigned To: Bernhard Rosenkraenzer
Aaron Brown
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Depends On:
Blocks:
  Show dependency treegraph
 
Reported: 2001-05-13 13:35 EDT by Need Real Name
Modified: 2007-04-18 12:33 EDT (History)
0 users

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Doc Type: Bug Fix
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Last Closed: 2001-05-13 14:22:43 EDT
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Description Need Real Name 2001-05-13 13:35:11 EDT
Description of Problem:

man 1.5h1-10 (version released with rh7.0) has a heap based overflow
in man.c, get_section_list() function. The check 

      if (end == NULL || i + 1 == sizeof (tmp_section_list))
        break;
should be
      if (end == NULL || i + 1 == (sizeof (tmp_section_list) /
sizeof(tmp_section_list[0]))
        break;

There exists an exploit for gid man.

How Reproducible:

Make a section list with over 100 elements in it.

Steps to Reproduce:
1. man -S `perl -e 'print ":" x 101'` ls

Actual Results:

Segmentation fault

Expected Results:

No manual entry for ls

Additional Information:
	
A root exploit from gid man also exists.
Comment 1 Bernhard Rosenkraenzer 2001-05-13 14:22:38 EDT
Quick fix: Update to the versions from 7.1 or rawhide (preferred).
I'll take care of errataing this now.
Comment 2 Bernhard Rosenkraenzer 2001-05-21 14:38:10 EDT
The errata package just passed QA - closing this bug.
Comment 3 Bernhard Rosenkraenzer 2001-05-21 14:39:50 EDT
By the way, I could not find any information about a root exploit from gid man 
anywhere on the net.
If this is indeed true, please open a new bug report with information on this.

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