Amazon Linux AMI update for nginx

1) Integer overflow

EUVDB-ID: #VU7410

Risk: Medium

CVSSv3.1: 7.7 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N/E:P/RL:O/RC:C]

CVE-ID: CVE-2017-7529

CWE-ID: CWE-190 - Integer overflow

Exploit availability: Yes

Description

The vulnerability allows a remote attacker to gain access to potentially sensitive information.

The vulnerability exists due to integer overflow when processing specially crafted requests. A remote attacker can send a malicious request to vulnerable server and gain access to potentially sensitive information.
 
When using nginx with standard modules this allows an attacker to obtain a cache file header if a response was returned from cache. In some configurations a cache file header may contain IP address of the backend server or other sensitive information.

Mitigation

Update the affected packages.

i686:
    nginx-all-modules-1.12.1-1.32.amzn1.i686
    nginx-1.12.1-1.32.amzn1.i686
    nginx-mod-http-geoip-1.12.1-1.32.amzn1.i686
    nginx-mod-mail-1.12.1-1.32.amzn1.i686
    nginx-debuginfo-1.12.1-1.32.amzn1.i686
    nginx-mod-http-xslt-filter-1.12.1-1.32.amzn1.i686
    nginx-mod-http-perl-1.12.1-1.32.amzn1.i686
    nginx-mod-stream-1.12.1-1.32.amzn1.i686
    nginx-mod-http-image-filter-1.12.1-1.32.amzn1.i686

src:
    nginx-1.12.1-1.32.amzn1.src

x86_64:
    nginx-all-modules-1.12.1-1.32.amzn1.x86_64
    nginx-1.12.1-1.32.amzn1.x86_64
    nginx-mod-http-geoip-1.12.1-1.32.amzn1.x86_64
    nginx-debuginfo-1.12.1-1.32.amzn1.x86_64
    nginx-mod-mail-1.12.1-1.32.amzn1.x86_64
    nginx-mod-stream-1.12.1-1.32.amzn1.x86_64
    nginx-mod-http-xslt-filter-1.12.1-1.32.amzn1.x86_64
    nginx-mod-http-image-filter-1.12.1-1.32.amzn1.x86_64
    nginx-mod-http-perl-1.12.1-1.32.amzn1.x86_64

Vulnerable software versions

Amazon Linux AMI: All versions

External links

http://alas.aws.amazon.com/ALAS-2017-894.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. However, proof of concept for this vulnerability is available.