Amazon Linux AMI update for ruby22

Published: 2015-06-16

Risk	Medium
Patch available	YES
Number of vulnerabilities	2
CVE-ID	CVE-2015-3900 CVE-2015-4020
CWE-ID	CWE-254 CWE-20
Exploitation vector	Network
Public exploit	N/A
Vulnerable software	Amazon Linux AMI Operating systems & Components / Operating system
Vendor	Amazon Web Services

Security Bulletin

This security bulletin contains information about 2 vulnerabilities.

1) Security Features

EUVDB-ID: #VU32365

Risk: Medium

CVSSv4.0: 2.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2015-3900

CWE-ID: CWE-254 - Security Features

Exploit availability: No

Description

The vulnerability allows a remote non-authenticated attacker to manipulate data.

RubyGems 2.0.x before 2.0.16, 2.2.x before 2.2.4, and 2.4.x before 2.4.7 does not validate the hostname when fetching gems or making API requests, which allows remote attackers to redirect requests to arbitrary domains via a crafted DNS SRV record, aka a "DNS hijack attack."

Mitigation

Update the affected packages:

i686:
    rubygem22-io-console-0.4.3-1.6.amzn1.i686
    ruby22-devel-2.2.2-1.6.amzn1.i686
    ruby22-libs-2.2.2-1.6.amzn1.i686
    ruby22-debuginfo-2.2.2-1.6.amzn1.i686
    rubygem22-bigdecimal-1.2.6-1.6.amzn1.i686
    rubygem22-psych-2.0.8-1.6.amzn1.i686
    ruby22-2.2.2-1.6.amzn1.i686

noarch:
    ruby22-doc-2.2.2-1.6.amzn1.noarch
    ruby22-irb-2.2.2-1.6.amzn1.noarch
    rubygems22-devel-2.4.5-1.6.amzn1.noarch
    rubygems22-2.4.5-1.6.amzn1.noarch

src:
    ruby22-2.2.2-1.6.amzn1.src

x86_64:
    ruby22-devel-2.2.2-1.6.amzn1.x86_64
    ruby22-libs-2.2.2-1.6.amzn1.x86_64
    rubygem22-io-console-0.4.3-1.6.amzn1.x86_64
    ruby22-debuginfo-2.2.2-1.6.amzn1.x86_64
    rubygem22-psych-2.0.8-1.6.amzn1.x86_64
    rubygem22-bigdecimal-1.2.6-1.6.amzn1.x86_64
    ruby22-2.2.2-1.6.amzn1.x86_64

Vulnerable software versions

Amazon Linux AMI: All versions

CPE2.3

cpe:2.3:o:amazon_web_services:amazon_linux_ami:*:*:*:*:*:*:*:*

External links

https://alas.aws.amazon.com/ALAS-2015-549.html

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.

2) Input validation error

EUVDB-ID: #VU32366