impressCMS 1.3.5 arbitrary file deletion and XSS

2014.02.01
Credit: Pedro Ribeiro
Risk: Medium
Local: No
Remote: Yes
CWE: N/A


CVSS Base Score: 6.4/10
Impact Subscore: 4.9/10
Exploitability Subscore: 10/10
Exploit range: Remote
Attack complexity: Low
Authentication: No required
Confidentiality impact: None
Integrity impact: Partial
Availability impact: Partial

I have discovered two vulnerabilities in ImpressCMS. These have been fixed in the new 1.3.6 version, which you can get at https://sourceforge.net/projects/impresscms/files/ImpressCMS%20Official%20Releases/ImpressCMS%201.3%20Branch/ImpressCMS%201.3.6/ . One is an arbitrary file deletion and the other is two cross site scripting issues. Note that I was unable to exploit the XSS issues due to the inbuilt protection module, so I'm not sure if it qualifies for a CVE. The tickets containing the information are available here https://www.assembla.com/spaces/dW4voyNP0r4ldbeJe5cbLr/tickets?report%5Bestimate_show%5D=true&report%5Bid%5D=0&report%5Bmilestone_id_cond%5D=1&report%5Bmilestone_id_val%5D=4129593&report%5Btitle%5D=All+Tickets+for+%27ImpressCMS+1.3.6%27&report%5Btotal_estimate_show%5D=true&report%5Btotal_invested_hours_show%5D=true&report%5Bworking_hours_show%5D=true. Unfortunately I can't paste the full report in this email as the Android Gmail client will mangle it. Please see the text file at https://github.com/pedrib/PoC/blob/master/ImpressCMS/impresscms-1.3.5.txtfor more details. Thanks in advance, and thanks to the ImpressCMS team for being so responsive. Regards, Pedro Ribeiro Agile Information Security

References:

https://sourceforge.net/projects/impresscms/files/ImpressCMS%20Official%20Releases/ImpressCMS%201.3%20Branch/ImpressCMS%201.3.6/


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