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Category:   Application (Generic)  >   Ruby Vendors:   Matsumoto, Yukihiro
(Ubuntu Issues Fix) Ruby Flaws in RubyGems Let Remote Users Hijack the DNS and Overwrite Files and Let Local Users Deny Service
SecurityTracker Alert ID:  1040314
SecurityTracker URL:  http://securitytracker.com/id/1040314
CVE Reference:   CVE-2017-0901, CVE-2017-0902   (Links to External Site)
Date:  Feb 1 2018
Impact:   Denial of service via local system, Modification of system information, Modification of user information, User access via network
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): 2.2.7 and before, 2.3.4 and before, 2.4.1 and before
Description:   Several vulnerabilities were reported in Ruby in the RubyGems component. A local user can cause denial of service conditions on the target system. A remote user can cause files to be overwritten on the target system. A remote user can hijack DNS session.

A local user can supply a specially crafted 'query' command to cause denial of service conditions on the target system [CVE-2017-0900].

A remote user can create a specially crafted RubyGem that, when installed by the target user, will overwrite arbitrary files on the target system [CVE-2017-0901].

A remote user can hijack DNS sessions [CVE-2017-0902].

An ANSI escape vulnerability exists [CVE-2017-0899]. The impact was not specified.

[Editor's note: The vulnerabilities reside in RubyGems, which is bundled with Ruby.]

Jonathan Claudius and Yusuke Endoh reported these vulnerabilities.

Impact:   A local user can cause denial of service conditions on the target system.

A remote user can cause files to be overwritten on the target system in certain cases.

A remote user can hijack DNS sessions.

Solution:   Ubuntu has issued a fix for CVE-2017-0901 and CVE-2017-0902.

The Ubuntu advisory is available at:

https://www.ubuntu.com/usn/usn-3553-1

Vendor URL:  www.ubuntu.com/usn/usn-3553-1 (Links to External Site)
Cause:   Access control error
Underlying OS:  Linux (Ubuntu)
Underlying OS Comments:  16.04 LTS, 17.10

Message History:   This archive entry is a follow-up to the message listed below.
Aug 30 2017 Ruby Flaws in RubyGems Let Remote Users Hijack the DNS and Overwrite Files and Let Local Users Deny Service



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