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Bug 1427872 - (CVE-2017-1000048) CVE-2017-1000048 nodejs-qs: Prototype override protection bypass
CVE-2017-1000048 nodejs-qs: Prototype override protection bypass
Status: NEW
Product: Security Response
Classification: Other
Component: vulnerability (Show other bugs)
unspecified
All Linux
medium Severity medium
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Assigned To: Red Hat Product Security
impact=moderate,public=20170301,repor...
: Security
Depends On: 1427874 1427875 1427876 1470072 1485934 1485935
Blocks: 1427873
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Reported: 2017-03-01 07:49 EST by Andrej Nemec
Modified: 2018-06-29 18:18 EDT (History)
30 users (show)

See Also:
Fixed In Version: nodejs-qs 6.4.0, nodejs-qs 6.3.2, nodejs-qs 6.2.3, nodejs-qs 6.1.2, nodejs-qs 6.0.4
Doc Type: If docs needed, set a value
Doc Text:
It was found that ljharb's qs module for Node.js did not properly parse query strings. An attacker could send a specially crafted query that overwrites the resulting object's prototype properties (such as toString() or hasOwnProperty()), resulting in a denial of service when the overwritten function would be executed.
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RHEL 7.3 requirements from Atomic Host:
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External Trackers
Tracker ID Priority Status Summary Last Updated
Red Hat Product Errata RHSA-2017:2672 normal SHIPPED_LIVE Moderate: rh-nodejs6-nodejs-qs security update 2017-09-07 14:30:23 EDT

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Description Andrej Nemec 2017-03-01 07:49:13 EST 
By default qs protects against attacks that attempt to overwrite an object's existing prototype properties, such as toString(), hasOwnProperty(),etc.

Overwriting these properties can impact application logic, potentially allowing attackers to work around security controls, modify data, make the application unstable and more.

In versions of the package affected by this vulnerability, it is possible to circumvent this protection and overwrite prototype properties and functions by prefixing the name of the parameter with [ or ]. e.g. qs.parse("]=toString") will return {toString = true}, as a result, calling toString() on the object will throw an exception.

References:

https://snyk.io/vuln/npm:qs:20170213

Upstream patches:

https://github.com/ljharb/qs/commit/beade029171b8cef9cee0d03ebe577e2dd84976d
https://github.com/ljharb/qs/commit/12152db9
Comment 1 Andrej Nemec 2017-03-01 07:52:35 EST 
Created nodejs-qs tracking bugs for this issue:

Affects: epel-6 [bug 1427875]
Affects: epel-7 [bug 1427876]
Affects: fedora-all [bug 1427874]
Comment 4 Cedric Buissart 2017-08-28 07:57:11 EDT 
rh-nodejs4-nodejs-qs is based on nodejs-qs-1.2.2, which does not have support for the allowPrototypes options, and is thus not affected by this.
Comment 5 Cedric Buissart 2017-08-28 08:59:12 EDT 
External References:

https://snyk.io/vuln/npm:qs:20170213
Comment 9 errata-xmlrpc 2017-09-07 10:30:57 EDT 
This issue has been addressed in the following products:

  Red Hat Software Collections for Red Hat Enterprise Linux 6
  Red Hat Software Collections for Red Hat Enterprise Linux 6.7 EUS
  Red Hat Software Collections for Red Hat Enterprise Linux 7
  Red Hat Software Collections for Red Hat Enterprise Linux 7.3 EUS

Via RHSA-2017:2672 https://access.redhat.com/errata/RHSA-2017:2672
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