### 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...
### 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
