Tuesday, June 10, 2014

Opera Coast SSL Man-in-the-Middle Vulnerability

# Vulnerability: Opera Coast SSL Man-in-the-Middle Vulenerability
# Software Link: https://itunes.apple.com/pl/app/opera-coast-web-browser/id674024845
# Vulnerable versions: 3.01 and earlier
# CVE: not yet assigned
# Author: Lukasz Pilorz
# http://browser-shredders.blogspot.com

1. Vulnerability

Opera Coast browser for iOS was vulnerable to man-in-the-middle attacks against SSL-protected web pages. The validation of the webpage certificate was performed for the domain of the main document only, skipping resources embedded from other domains.

2. Proof of Concept


3. Fix
This specific issue was fixed in version 3.02.

Other potentially unfixed vectors may be related to the fact that for some cases of invalid SSL certificates for the main domain the user is alerted of an error, but the page content is still loaded in background (potentially accessing cookies or performing cache poisoning attacks). These vectors were not retested in detail.

4. Timeline

22.01.2014 - initial contact regarding SSL MITM in Coast (not this specific issue), received detailed response explaining why Opera does not consider it to be a bug
29.01.2014 - public disclosure on OWASP Poland meeting
11.03.2014 - second report with this specific issue presented (with paypal.com proof-of-concept), received immediate response confirming the bug
24.04.2014 - partially fixed version released
26.05.2014 - version 3.02 with final fix released

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