Amazon Linux AMI update for emacs

1) Input validation error

EUVDB-ID: #VU33781

Risk: High

CVSSv4.0: 5.7 [CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Amber]

CVE-ID: CVE-2017-14482

CWE-ID: CWE-20 - Improper input validation

Exploit availability: No

Description

The vulnerability allows a remote non-authenticated attacker to execute arbitrary code.

GNU Emacs before 25.3 allows remote attackers to execute arbitrary code via email with crafted "Content-Type: text/enriched" data containing an x-display XML element that specifies execution of shell commands, related to an unsafe text/enriched extension in lisp/textmodes/enriched.el, and unsafe Gnus support for enriched and richtext inline MIME objects in lisp/gnus/mm-view.el. In particular, an Emacs user can be instantly compromised by reading a crafted email message (or Usenet news article).

Mitigation

Update the affected packages:

i686:
    emacs-common-24.3-20.22.amzn1.i686
    emacs-24.3-20.22.amzn1.i686
    emacs-debuginfo-24.3-20.22.amzn1.i686

noarch:
    emacs-el-24.3-20.22.amzn1.noarch

src:
    emacs-24.3-20.22.amzn1.src

x86_64:
    emacs-24.3-20.22.amzn1.x86_64
    emacs-common-24.3-20.22.amzn1.x86_64
    emacs-debuginfo-24.3-20.22.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-2017-912.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.