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Newtelligence dasBlog 2.3 Open Redirect

Newtelligence dasBlog 2.3 Open Redirect
Posted Oct 20, 2014
Authored by Jing Wang

Newtelligence dasBlog versions 2.1 through 2.3 suffer from an open redirection vulnerability.

tags | exploit
advisories | CVE-2014-7292
SHA-256 | acebdebb88e6ab98df4acc6febaad346406e10e0b78ca1a47d536a53a745058c

Newtelligence dasBlog 2.3 Open Redirect

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Exploit Title: Newtelligence dasBlog Open Redirect Vulnerability
Product: dasBlog
Vendor: Newtelligence
Vulnerable Versions: 2.3 (2.3.9074.18820) 2.2 (2.2.8279.16125)
2.1(2.1.8102.813)
Tested Version: 2.3 (2.3.9074.18820)
Advisory Publication: OCT 15, 2014
Latest Update: OCT 15, 2014
Vulnerability Type: Open Redirect [CWE-601]
CVE Reference: CVE-2014-7292
Risk Level: Low
CVSSv2 Base Score: 2.6 (AV:N/AC:H/Au:N/C:N/I:P/A:N)
Credit: Wang Jing [Mathematics, Nanyang Technological University, Singapore]




Advisory Details:

Newtelligence dasBlog ct.ashx is vulnerable to Open Redirect attacks.


dasBlog supports a feature called Click-Through which basically tracks all
links clicked inside your blog posts. It's a nice feature that allows the
blogger to stay informed what kind of content readers like. If
Click-Through is turned on, all URLs inside blog entries will be replaced
with <URL to your blog>/ct.ashx?id=<Blog entry ID>&url=<URL-encoded
original URL> which of course breaks WebSnapr previews.


Web.config code:
<add verb="*" path="ct.ashx"
type="newtelligence.DasBlog.Web.Services.ClickThroughHandler,
newtelligence.DasBlog.Web.Services"/>


(1) The vulnerability occurs at "ct.ashx?" page, with "&url" parameter.



Solutions:
2014-10-15 Public disclosure with self-written patch.




References:
http://www.tetraph.com/blog/cves/cve-2014-7292-newtelligence-dasblog-open-redirect-vulnerability/
https://searchcode.com/codesearch/view/8710666/
https://www.microsoft.com/web/gallery/dasblog.aspx
https://dasblog.codeplex.com/releases/view/86033
http://cwe.mitre.org
http://cve.mitre.org/


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