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view contrib/README @ 7060:1adc6b0d5eaa stable-1.12
Range filter: protect from total size overflows.
The overflow can be used to circumvent the restriction on total size of
ranges introduced in c2a91088b0c0 (1.1.2). Additionally, overflow
allows producing ranges with negative start (such ranges can be created
by using a suffix, "bytes=-100"; normally this results in 200 due to
the total size check). These can result in the following errors in logs:
[crit] ... pread() ... failed (22: Invalid argument)
[alert] ... sendfile() failed (22: Invalid argument)
When using cache, it can be also used to reveal cache file header.
It is believed that there are no other negative effects, at least with
standard nginx modules.
In theory, this can also result in memory disclosure and/or segmentation
faults if multiple ranges are allowed, and the response is returned in a
single in-memory buffer. This never happens with standard nginx modules
though, as well as known 3rd party modules.
Fix is to properly protect from possible overflow when incrementing size.
author | Maxim Dounin <mdounin@mdounin.ru> |
---|---|
date | Tue, 11 Jul 2017 16:06:23 +0300 |
parents | 1bdf906bba99 |
children |
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geo2nginx.pl by Andrei Nigmatulin The perl script to convert CSV geoip database ( free download at http://www.maxmind.com/app/geoip_country ) to format, suitable for use by the ngx_http_geo_module. unicode2nginx by Maxim Dounin The perl script to convert unicode mappings ( available at http://www.unicode.org/Public/MAPPINGS/ ) to the nginx configuration file format. Two generated full maps for windows-1251 and koi8-r. vim by Evan Miller Syntax highlighting of nginx configuration for vim, to be placed into ~/.vim/.