[UNIX] libremail Format String (DEBUG, pop.c)

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libremail Format String (DEBUG, pop.c)
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SUMMARY

<http://libremail.tuxfamily.org/> libremail is "a set of command line
mail tools, it includes several clients, and allows to filter mails".

A format string vulnerability has been found in libremail's POP handling
routines when the library has been set to run in DEBUG mode, the
vulnerability can be exploited by remote attackers to cause the library to
execute arbitrary code.

DETAILS

Vulnerable Systems:
* libremail version 1.1.0 and prior

There is a format string vulnerability in pop.c:

Vulnerable code:
[...]
void lire_pop ()
{
int posbuf;
// initialisation
posbuf = 0;

// lecture jusqu'en fin de ligne ou de buffer
do
recv (sockfd, buf_lect + posbuf, 1, 0);
while (buf_lect [posbuf++] != 'n' && posbuf < sz_buflect);

// terminer la chaine de caract res lue (on supprime rn)
if (posbuf > 1 && buf_lect [posbuf - 2] == 'r')
buf_lect [posbuf - 2] = '\0';

else
buf_lect [posbuf - 1] = '\0';

#ifdef DEBUG
putchar ('<');
printf (buf_lect);
#endif
}

It could be exploited by tricking a user into connecting to a malicious
POP server, or by sending a malicious mail (if the user reads it through a
POP server), however it requires that debug mode is activated (not default
setting).

Vendor Status:
The vendor has published updated sources:
<http://libremail.tuxfamily.org/en/dersources.htm>
http://libremail.tuxfamily.org/en/dersources.htm


ADDITIONAL INFORMATION

The original article can be found at:
<http://www.zone-h.org/en/advisories/read/id=8527/>
http://www.zone-h.org/en/advisories/read/id=8527/



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