oss-security - Re: npm uses predictable temporary filenames when unpacking tarballs

Follow @Openwall on Twitter for new release announcements and other news

[<prev] [next>] [<thread-prev] [day] [month] [year] [list]

Date: Thu, 11 Jul 2013 12:05:14 -0600
From: Kurt Seifried <kseifried@...hat.com>
To: oss-security@...ts.openwall.com
CC: Daniel Kahn Gillmor <dkg@...thhorseman.net>, 715325@...s.debian.org
Subject: Re: npm uses predictable temporary filenames when
 unpacking tarballs

-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1

On 07/10/2013 02:04 PM, Daniel Kahn Gillmor wrote:
> On 07/10/2013 04:02 PM, Daniel Kahn Gillmor wrote:
>> hi oss-sec folks--
>> 
>> i recently learned that npm, the node.js language-specific
>> package manager, created predictable temporary directory names in
>> a world-writable filesystem (/tmp) by default when unpacking
>> archives.
>> 
>> It looks like this might leave open a classic symlink race such
>> that one user could control the location where another user
>> unpacked packages coming from an npm installation.
>> 
>> if the superuser was the one running npm, this might have led to
>> a non-privileged user who wins the race getting a privilege
>> escalation as well, depending on the contents of the fetched
>> package.
>> 
>> The issue appears to have been fixed upstream today, here:
>> 
>> https://github.com/isaacs/npm/commit/f4d31693
>> 
>> I first learned about the problem during a related a bug report 
>> http://bugs.debian.org/715325 (cc'ed here)
> 
> sorry, i should also have mentioned that the upstream bug report
> is:
> 
> https://github.com/isaacs/npm/issues/3635
> 
> --dkg
> 

Thanks for the link. Please use CVE-2013-4116 for this issue.

- -- 
Kurt Seifried Red Hat Security Response Team (SRT)
PGP: 0x5E267993 A90B F995 7350 148F 66BF 7554 160D 4553 5E26 7993
-----BEGIN PGP SIGNATURE-----
Version: GnuPG v1.4.13 (GNU/Linux)
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=1P+S
-----END PGP SIGNATURE-----

Please check out the Open Source Software Security Wiki, which is counterpart to this mailing list.

Confused about mailing lists and their use? Read about mailing lists on Wikipedia and check out these guidelines on proper formatting of your messages.