Date: Mon, 08 Sep 2014 10:21:10 -0600 From: Kurt Seifried <kseifried@...hat.com> To: cve-assign@...re.org CC: oss-security@...ts.openwall.com Subject: Re: Python robotframework - tmp vuln On 08/09/14 09:22 AM, cve-assign@...re.org wrote: >> This is the first of many > > The MITRE CVE team obviously has no objection to your use of the > oss-security list for raising new discussion topics such as the > likelihood that a '../tmp/ substring represents a security problem. > The comments below are only about obtaining CVE assignments from > MITRE. > >> the reason I'm not assigning CVE's for these is this is a side project > > A CVE isn't going to be possible without further analysis explaining > why a vulnerability exists in the specific case. There can't be an > expectation that someone at MITRE is already familiar with the > product, or will read and understand the complete source code as part > of processing an oss-security message. > > Items that seem to be missing from the original message include: > > 1, Is the "merge('../tmp/passing.xml', '../tmp/failing.xml')" > debugging code, or is this code realistically used because a > different piece of software has created passing.xml and failing.xml > files? It's part of __main__ so it gets executed. > 2. If there is a realistic situation in which the > "merge('../tmp/passing.xml', '../tmp/failing.xml')" executes, would > the cwd realistically be a first-level directory such as the /root > or /tmp directory? yes if you run from within /root or /tmp, the "run from /root" would be the obvious worry as it would indicate the root user is being used. > 3. For purposes of risk analysis, is unconstrained use of a ../tmp/ > pathname always equivalent to unconstrained use of a /tmp/ pathname? If it ends up using /tmp/ then I would say that's a problem. is it always a problem? I can't say. > A possible CVE assignment decision might be: > > A. If a different product came with a test suite containing: > > test_program > /tmp/merged.xml > > then it could have a CVE because /tmp/merged.xml might be a symlink to > an important file. > > B. If the test suite were changed to: > > test_program > ../tmp/merged.xml > > with no constraints, then it could still have a CVE, because some > people run test suites as root with a cwd of the /root directory. > > C. If ../tmp/ is used in "debugging code" that is intended to be run > by a developer who understands the appropriate cwd, and this > "debugging code" is not a "test suite" for users, then there is no CVE > assignment. Admittedly, there might be cases where the distinction > between "debugging code" and "test suite" is completely ambiguous. > > -- Kurt Seifried -- Red Hat -- Product Security -- Cloud PGP A90B F995 7350 148F 66BF 7554 160D 4553 5E26 7993 Download attachment "signature.asc" of type "application/pgp-signature" (820 bytes)
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