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Posted to batik-dev@xmlgraphics.apache.org by "Lars Krapf (JIRA)" <ji...@apache.org> on 2015/12/07 18:45:11 UTC
[jira] [Updated] (BATIK-1139) SSRF through external DTD resolution
[ https://issues.apache.org/jira/browse/BATIK-1139?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Lars Krapf updated BATIK-1139:
------------------------------
Description:
The fix for XXE (BATIK-1018) seems to be incomplete.
External DTD resolution should also be disabled in order to avoid attacks like SSRF or port-scanning behind the firewall.
See attached file (ssrf.svg) for an example.
{code}
chaotic@m0lly:~$ nc -l 2323
GET / HTTP/1.1
User-Agent: Java/1.7.0_60-ea
Host: localhost:2323
Accept: text/html, image/gif, image/jpeg, *; q=.2, */*; q=.2
Connection: keep-alive
{code}
To fix it you could disable the external DTD resolution altogether, using the document factory configuration, i.e.
{code}
dbf.setFeature("http://apache.org/xml/features/nonvalidating/load-external-dtd", false);
{code}
See also https://www.owasp.org/index.php/XML_External_Entity_(XXE)_Processing for more information on XXE.
was:
The fix for XXE (BATIK-1018) seems to be incomplete.
External DTD resolution should also be disabled in order to avoid attacks like SSRF or port-scanning behind the firewall.
See attached file (ssrf.svg) for an example.
{code}
chaotic@m0lly:~$ nc -l 2323
GET / HTTP/1.1
User-Agent: Java/1.7.0_60-ea
Host: localhost:2323
Accept: text/html, image/gif, image/jpeg, *; q=.2, */*; q=.2
Connection: keep-alive
{code}
To fix it you could disable the external DTD resolution altogether, using the document factory configuration, i.e.
{code}
dbf.setFeature("http://apache.org/xml/features/nonvalidating/load-external-dtd", false);
{code}
See also [https://www.owasp.org/index.php/XML_External_Entity_(XXE)_Processing|OWASP] for more information on XXE.
> SSRF through external DTD resolution
> ------------------------------------
>
> Key: BATIK-1139
> URL: https://issues.apache.org/jira/browse/BATIK-1139
> Project: Batik
> Issue Type: Bug
> Components: SVG Rasterizer
> Affects Versions: 1.8
> Reporter: Lars Krapf
> Attachments: ssrf.svg
>
>
> The fix for XXE (BATIK-1018) seems to be incomplete.
> External DTD resolution should also be disabled in order to avoid attacks like SSRF or port-scanning behind the firewall.
> See attached file (ssrf.svg) for an example.
> {code}
> chaotic@m0lly:~$ nc -l 2323
> GET / HTTP/1.1
> User-Agent: Java/1.7.0_60-ea
> Host: localhost:2323
> Accept: text/html, image/gif, image/jpeg, *; q=.2, */*; q=.2
> Connection: keep-alive
> {code}
> To fix it you could disable the external DTD resolution altogether, using the document factory configuration, i.e.
> {code}
> dbf.setFeature("http://apache.org/xml/features/nonvalidating/load-external-dtd", false);
> {code}
> See also https://www.owasp.org/index.php/XML_External_Entity_(XXE)_Processing for more information on XXE.
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