Title: Blosxom Writeback Plug-in HTML Injection Vulnerability
Severity: MODERATE
Description:
Blosxom is a web based application used to create web logs. It is available for Mac OS X and other platforms as a CGI script. Many plug-ins are available for Blosxom including 'writeback', which is used to post comments on a site.
Blosxom is prone to an HTML injection vulnerability. This issue presents itself when Blosxom is used in combination with the 'writeback' plug-in. It is reported that the filtering function does not filter script tags properly. This can allow an attacker to inject HTML and script code when posting comments on a vulnerable site. The attacker can bypass filtering by adding carriage returns before the closing bracket in the script tags.
The attacker-supplied HTML and script code would be able to access properties of the site, potentially allowing for theft of cookie-based authentication credentials. An attacker could also exploit this issue to control how the site is rendered to the user.
Blosxom version 2.0 is affected by this issue, however, other versions could be vulnerable as well.
Affected Products:
- Blosxom Blosxom 2.0.0
References:
- Blosxom: Blosxom Homepage
- Ivan Grynov: Re: [blosxom] XSS in writeback
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