Date: Thu, 23 Aug 2018 15:33:33 +0200 From: Leonardo Taccari <iamleot@...il.com> To: oss-security@...ts.openwall.com Subject: Re: Re: More Ghostscript Issues: Should we disable PS coders in policy.xml by default? Hello Bob, Bob Friesenhahn writes: > You are missing something. While they are unlikely to be triggered by > default (but still could be triggered by an attacker with sufficient > control), testing shows that > > convert -verbose PS2:file.ps outfile.png > convert -verbose file.ps2 outfile.png > convert -verbose PS3:file.ps outfile.png > convert -verbose file.ps3 outfile.png > > does in fact invoke Ghostscript. Whoops, I stand corrected, sorry for the incorrect information! (at least when invoking them with the `PS2:' or `PS3:' prefixes, anyway, yes, both PS2 and PS3 policy rules are worth to be added as well). (Regarding the `file.ps2' and `file.ps3' examples without `PS2:' or `PS3:' prefixes according `convert -debug Policy -log "%e"' it seems that they ends up as: Domain: Coder; rights=Read; pattern="PS" ... ...so should be blocked by the workaround described in VU#332928. But please correct me if I'm wrong.) JFTR, not related to PS2 and PS3 but also a possible ghostcript consumer: EPT seems to ends up as `pattern="PS"' too (unlike PS2 and PS3). Thank you!
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