nginx security advisory (CVE-2017-7529)

[Maxim Dounin]

Hello!

A security issue was identified in nginx range filter.  A specially
crafted request might result in an integer overflow and incorrect
processing of ranges, potentially resulting in sensitive information
leak (CVE-2017-7529).

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.

Besides, with 3rd party modules it is potentially possible that
the issue may lead to a denial of service or a disclosure of
a worker process memory.  No such modules are currently known though.

The issue affects nginx 0.5.6 - 1.13.2.
The issue is fixed in nginx 1.13.3, 1.12.1.

For older versions, the following configuration can be used
as a temporary workaround:

    max_ranges 1;

Patch for the issue can be found here:

http://nginx.org/download/patch.2017.ranges.txt


-- 
Maxim Dounin
http://nginx.org/