Yawcam 0.6.0 Directory Traversal

Credit: David Panter
Risk: Medium
Local: No
Remote: Yes

CVSS Base Score: 5/10
Impact Subscore: 2.9/10
Exploitability Subscore: 10/10
Exploit range: Remote
Attack complexity: Low
Authentication: No required
Confidentiality impact: Partial
Integrity impact: None
Availability impact: None

Directory traversal vulnerability in Yawcam webcam server ========================================================= Overview -------- Affected Versions: Yawcam 0.2.6 through 0.6.0 Patched Versions: Yawcam 0.6.1 Vendor: Yawcam Vendor URL: http://www.yawcam.com CVE: CVE-2017-17662 Credit: David Panter, Global Relay CSOC Status: Public Public disclosure URL: http://www.yawcam.com/news.php Summary ------- By sending a specially crafted HTTP GET request a remote attacker can read arbitrary files on the target computer under the privileges of the Yawcam software or service. Product Description ------------------- Yawcam is a free webcam software with an integrated HTTP server and wide variety of features. Severity Rating: High Vulnerability description ------------------------- The Yamcam HTTP server contains a directory traversal vulnerability that allows attacker to read arbitrary files through a sequence in the form '.x./' or '....\x/' where x is a pattern composed of one or more (zero or more for the second pattern) of either \ or ..\ for example '.\./', '....\/' or '...\./'. For files with no extension a single dot needs to be appended to ensure the HTTP server does not alter the request. POC --- By sending the following string to the Yawcam HTTP server we can read the hosts file from the target machine "GET /.\./.\./.\./.\./.\./.\./.\./windows/system32/drivers/etc/hosts." Timeline -------- 2017-12-12 Vulnerability discovered 2017-12-13 Vendor contacted 2017-12-13 CVE ID assigned 2017-12-15 Vendor reply 2017-12-18 Fixed version released 2017-12-18 Vendor disclosed vulnerability

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