PT-2009-43: Session predictability in Kayako Support Suite

Vulnerable Software

Kayako Support Suite
Version 3.60.04 stable and possibly earlier


Security Level

Security Level:          Low
Impact:                        Session predictability
Attack Vector:          Remote

CVSS v2:
Base Score:     4.3
Temporal Score: 3.2
Vector:         (AV:N/AC:M/Au:N/C:P/I:N/A:N/E:U/RL:O/RC:C)

CVE:   not assigned

Software Description

Kayako Support Suite is a HelpDesk system.

Vulnerability Description

Positive Technologies Research Team discovered several Session Fixation vulnerabilities in Kayako Support Suite.

To generate a session, insecure functions mt_rand() and uniqid() are used. Moreover, the function mt_srand() uses the function microtime() for seed, which allows an attacker to go over all possible variants of seed, set it and predict the value of the following sess_id or the file name when it is uploading.

The vulnerability details are not disclosed.


Update your software up to the latest version (3.70.01).

Bulletin Status

10/12/2009 - Vendor notified
10/13/2009 - Vendor response
02/09/2010 - The vendor confirmed the vulnerability and issued a workaround decision
03/12/2010 - Requested status update from vendor
04/08/2010 - Public disclosure


This vulnerability was discovered by Timur Yunusov (Positive Technologies Research Team)


Reports on the vulnerabilities previously discovered by Positive Technologies Research Team:

About Positive Technologies

Positive Technologies is among the key players in the IT security market in Russia.

The principal activities of the company include the development of integrated tools for information security monitoring (MaxPatrol); providing IT security consulting services and technical support; development of the Securitylab leading Russian information security portal.

Among the clients of Positive Technologies, there are more than 40 state enterprises, more than 50 banks and financial organizations,
20 telecommunication companies, more than 40 plant facilities, as well as IT, service and retail companies from Russia, the CIS countries, the Baltic States, China, Ecuador, Germany, Great Britain, Holland, Iran, Israel, Japan, Mexico, the Republic of South Africa, Thailand, Turkey, and the USA.

Positive Technologies is a team of highly skilled developers, advisers and experts with years of vast hands-on experience. The company specialists possess professional titles and certificates; they are the members of various international societies and are actively involved in the IT security field development.