Pidgin MXIT Contact Mood Denial of Service Vulnerability(CVE-2016-2373)

### DESCRIPTIONA 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 user can send an invalid mood to trigger this vulnerability.### CVSSv3 SCORE5.9 CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H### TESTED VERSIONSPidgin 2.10.11### PRODUCT URLshttps://www.pidgin.im/### DETAILSIn the function mxitparsecmd_contact in mxit/protocol.c at line 1743 contact->mood will be read from data coming from the server when parsing a contact update packet.“`1743 contact->mood = atoi( rec->fields[5]->data );“`At line 1759, this mood will be passed to the function mxitupdatecontact():“`1759 mxit_update_contact( session, contact );“`This function is defined in mxit/roster.c at line 363. If mood is anything other than 0, then this value is subsequently used to as index into the mxit_moods array at line 432.“`432 purple_prpl_got_user_status( session->acc, contact->username, "mood", PURPLE_MOOD_NAME, mxit_moods[contact->mood-1].mood, NULL );“`This can result in an out-of-bounds read of this information, potentially resulting in a crash of the program if that memory location is not accessible.### TIMELINE* 2016-04-13 – Vendor Notification * 2016-06-21 – Public Disclosure