Amazon Linux AMI update for exim

1) Information disclosure

EUVDB-ID: #VU1432

Risk: Medium

CVSSv3.1: 4.6 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N/E:U/RL:O/RC:C]

CVE-ID: CVE-2016-9963

CWE-ID: CWE-200 - Information exposure

Exploit availability: No

Description

The vulnerability allows a remote attacker to obtain potentially sensitive information.

The vulnerability exists due to usage of incorrect buffer when displaying error message for DATA command in src/src/transports/smtp.c file. A remote unauthenticated attacker can send a specially crafted SMTP command and obtain potentially sensitive information, such as DKIM key.

Mitigation

Update the affected packages.

i686:
    exim-4.88-2.11.amzn1.i686
    exim-mon-4.88-2.11.amzn1.i686
    exim-mysql-4.88-2.11.amzn1.i686
    exim-pgsql-4.88-2.11.amzn1.i686
    exim-debuginfo-4.88-2.11.amzn1.i686
    exim-greylist-4.88-2.11.amzn1.i686

src:
    exim-4.88-2.11.amzn1.src

x86_64:
    exim-pgsql-4.88-2.11.amzn1.x86_64
    exim-mon-4.88-2.11.amzn1.x86_64
    exim-debuginfo-4.88-2.11.amzn1.x86_64
    exim-mysql-4.88-2.11.amzn1.x86_64
    exim-4.88-2.11.amzn1.x86_64
    exim-greylist-4.88-2.11.amzn1.x86_64

Vulnerable software versions

Amazon Linux AMI: All versions

External links

http://alas.aws.amazon.com/ALAS-2017-804.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.