Thursday, 2017-01-19

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raroraI was looking at Bandit issues, can anyone give me a little more detail about why B310 is an issue? It says "Audit url open for permitted schemes. Allowing use of file:/ or custom schemes is often unexpected."15:07
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sigmavirusrarora: do you mean, why B310 exists (rather than why it's problematic)?15:14
rarorasigmavirus: yes15:14
sigmavirusrarora: B310 exists to alert the developer to the fact that untrusted URLs can access local files15:14
raroraI looked at some of the documentation for the library but was still a little confused15:14
sigmavirusrarora: for example, if some gives you a URL to download data from (ostensibly to store locally) and they give you a file:// URL, you might be tricked into downloading /etc/shadow15:15
raroraOh, alright. My understanding was that you would be able to get untrusted files from the web, not that the URL would be able to access files on the machine15:15
sigmavirusAnd this check exists to warn you15:15
sigmavirusIf you're not handling untrusted URLs, then you can ignore B31015:15
sigmavirusrarora: file:// is local only15:15
sigmavirusYou can use urlopen to access a local file on your machine  as long as you can read it15:16
raroraSo if it is local only how would I be downloading something?15:16
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raroraI'm thinking of this from the perspective of me running Cinder on a machine, if a URL is file:/ I'm just a little confused about the security issue if the file is already somewhere on my machine?15:17
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rarorasigmavirus: ?15:32
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sigmavirusrarora: so a better OpenStack-y example is with glance15:33
sigmaviruslet's say you use glance v1 and tell it to copy-from file:///etc/shadow15:33
sigmavirusGlance (were it not careful) would copy that as image data15:33
sigmavirusThen the user could do "glance image-download <id>"15:33
sigmavirusand get that15:33
sigmavirusSo in some cases it can be used for data exfiltration15:34
sigmavirusWith Cinder, I don't think there's a way for you a user to download a volume15:34
raroraahh, I see now, okay thanks! sorry I was a bit dense :D15:34
rarorasigmavirus: yeah, I'll have to look into each case, but I don't think it will be an issue there15:35
sigmavirusrarora: no need to apologize at all!15:35
sigmavirusrarora: like I said, it's merely a warning that will get you to loko a little more closely ideally15:35
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sigmavirushyakuhei: meeting in ~14 min?16:46
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hyakuheisigmavirus yup :)16:56
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hyakuheiMeeting started over in #openstack-meeting-alt17:00
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openstackgerritPhilip Jones proposed openstack/bandit: Alter SQL injection plugin to consider .format strings  https://review.openstack.org/41769520:24
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