Bug 19351 - MANSECT and -S overflow
Summary: MANSECT and -S overflow
Status: CLOSED CURRENTRELEASE
Alias: None
Product: Red Hat Linux
Classification: Retired
Component: man
Version: 6.2
Hardware: All
OS: Linux
medium
high
Target Milestone: ---
Assignee: Bernhard Rosenkraenzer
QA Contact: Aaron Brown
URL:
Whiteboard:
Keywords:
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2000-10-18 23:54 UTC by Tim
Modified: 2008-08-01 16:22 UTC (History)
1 user (show)

(edit)
Clone Of:
(edit)
Last Closed: 2000-10-19 12:05:21 UTC


Attachments (Terms of Use)

Description Tim 2000-10-18 23:54:03 UTC
From my post to the mailing list security-audit:

...I found another more interesting bug in the way the MANSECT environment 
variable and the -S command line option are parsed. get_section_list() is 
called on the contents of both of these variables to split the ':'-
separated 
lists into arrays. The array that the split off pieces are put in is 
defined 
as: 
    static char *tmp_section_list[100]; 
The check tries to stop get_section_list() writing past the 100th element 
is flawed: 
    if (end == NULL || i+1 == sizeof(tmp_section_list)) 
On my system, sizeof(tmp_section_list) is 400; 100 4-byte pointers. 
Clearly, 
the test expression should be something like this: 
    sizeof(tmp_section_list)/sizeof(tmp_section_list[0]) 
I haven't had much time to play with it, but I know what by supplying more 
than 100 ':'-separated items, _something_ gets clobbered and strange 
things 
happen eg. invoking apropos and whatis when I didn't ask for them. I'm not 
an exploit writer, so I'm not sure how exploitable the bug is, but it 
looks 
like there would be a way if you could make use of the return values of 
strdup().

Comment 1 Bernhard Rosenkraenzer 2000-10-19 12:05:16 UTC
Looking into it

Comment 2 Bernhard Rosenkraenzer 2000-10-19 12:29:19 UTC
Ok, fixed in 1.5h1-14, passing it on to QA.


Note You need to log in before you can comment on or make changes to this bug.