Pidgin MXIT Table Command Denial of Service Vulnerability(CVE-2016-2366)

2017-10-19T00:00:00
ID SSV:96738
Type seebug
Reporter Root
Modified 2017-10-19T00:00:00

Description

DESCRIPTION

A denial of service vulnerability exists in the handling of the MXIT protocol in Pidgin. Specially crafted MXIT data sent via the server could potentially result in an out-of-bounds read. A malicious server or an attacker who intercepts the network traffic can send invalid data to trigger this vulnerability and cause a crash.

CVSSv3 SCORE

5.9 CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H

TESTED VERSIONS

Pidgin 2.10.11

PRODUCT URLs

https://www.pidgin.im/

DETAILS

In the function command_table in mxit/formcmds.c at lines 531 and 535, the number of rows and columns for the table are received from the server. 531 nr_columns = atoi(tmp); .. 535 nr_rows = atoi(tmp);

These two values are then used in loops at line 547 and 548 and to access an array at line 549. 547 for (i = 0; i < nr_rows; i++) { for (j = 0; j < nr_columns; j++) { 549 purple_debug_info(MXIT_PLUGIN_ID, " Row %i Column %i = %s\n", i, j, coldata[i*nr_columns + j]); } }

An attacker can cause access to unmapped memory addresses, resulting in a denial of service.

TIMELINE

  • 2016-04-13 - Vendor Notification
  • 2016-06-21 - Public Disclosure