вторник, 2 июля 2013 г.

Insecure DNS records in top web projects

Last month ONsec_lab had discovered and reported about the same DNS issue in top web projects: live.com, facebook.com, yahoo.com, nokia.com, paypal.com, baidu.com, att.com and many others.

DNS linked few *.COMPANY.com domains to IP which doesn't belong to 
COMPANY.

These addressed from Private Address Space 10/8, 172.16/12, 192.168/16 (look at http://tools.ietf.org/html/rfc1918, https://en.wikipedia.org/wiki/IPv4) and localhost 127.0.0.1.

Basically, this may be interpreted as information leakage from intranet of COMPANY. But it's obvious :)

This server-side issue can be exploited as a client-side vulnerability when attacker and victim are in the same private network:

I.e. local.COMPANY.com have A-record to 10.0.0.123

1. Attacker connects to any public network with address space from 10.0.0.0/8 or other which linked to any local.COMPANY.com domain.
2. Attacker adds to network interface on his computer address from A-record which linked to private address 10.0.0.123.
3. Attacker publishes on any resource link to local.COMPANY.com (for example - banner on any news-site). Like as classic CSRF/reflected XSS attack.
4. All users, who connected to the same network (1) and see banner (3) will make request to http://local.COMPANY.com, which actually will be made to computer of attacker. Browser will  send cookies for *.COMPAMY.com in this request, because user make request to local.live.com. 

In this case malicious user steal cookies.

What about protection? 

Simple way is protect session cookies by Secure flag. This is facebook way. But anyway attacker can steal others non-Secure cookies. Also attacker in this case can do logout attack, because browsers have only 4Kb memory for all cookies which stored at all *.COMPANY.com domains. For this reason attacker can set many new cookies from local.COMPANY.com to delete all cookies from *.COMPANY.com and COMPANY.com scope.

Some examples:

./ccbill.com:192.168.169.170 backend.ccbill.com
./ccbill.com:192.168.13.127 internal.ccbill.com

./facebook.com:10.56.0.51 atlas.facebook.com
./facebook.com:10.56.0.69 hr.facebook.com
./facebook.com:10.60.0.29 lists.facebook.com
./facebook.com:10.170.0.4 ntp.facebook.com
./facebook.com:10.78.0.10 ntp.facebook.com
./facebook.com:10.60.0.195 sb.facebook.com
./facebook.com:10.170.0.4 time.facebook.com
./facebook.com:10.78.0.10 time.facebook.com
./facebook.com:10.56.0.7 xmail.facebook.com

./live.com:10.245.6.27 monitoring.live.com

./nokia.txt:10.113.1.11 guest.nokia.com
./nokia.txt:172.21.214.214 linux.nokia.com

./paypal.com:10.190.3.55 mx.paypal.com

./yahoo.com:10.72.164.31 i.yahoo.com
./yahoo.com:10.80.80.184 na.yahoo.com

./baidu.com:10.11.252.74 accounts.baidu.com
./baidu.com:10.81.7.51 ba.baidu.com
./baidu.com:172.18.100.200 bd.baidu.com
./baidu.com:10.36.155.42 bh.baidu.com
./baidu.com:10.36.160.22 bh.baidu.com
./baidu.com:10.38.19.40 bh.baidu.com
./baidu.com:10.42.7.24 bi.baidu.com
./baidu.com:10.44.64.20 bugs.baidu.com
./baidu.com:10.81.11.67 cd.baidu.com
./baidu.com:10.38.157.31 cdn.baidu.com
./baidu.com:10.26.7.93 cms.baidu.com
./baidu.com:10.26.137.29 com.baidu.com
./baidu.com:10.36.7.99 crm.baidu.com
./baidu.com:10.26.7.125 crm.baidu.com
./baidu.com:10.23.248.28 ct.baidu.com
./baidu.com:10.42.243.12 dc.baidu.com
./baidu.com:10.237.2.83 def.baidu.com
./baidu.com:10.65.211.94 dt.baidu.com
./baidu.com:172.18.0.180 ecom.baidu.com
./baidu.com:10.42.7.18 erp.baidu.com
./baidu.com:10.42.224.22 flow.baidu.com
./baidu.com:172.22.1.88 fw.baidu.com
./baidu.com:172.22.31.92 ga.baidu.com
./baidu.com:10.46.52.12 global.baidu.com
./baidu.com:10.42.58.42 global.baidu.com
./baidu.com:172.16.1.2 gw1.baidu.com
./baidu.com:10.240.31.12 h.baidu.com
./baidu.com:10.81.12.102 iq.baidu.com
./baidu.com:10.42.7.203 it.baidu.com
./baidu.com:10.42.7.54 km.baidu.com
./baidu.com:10.23.249.173 kr.baidu.com
./baidu.com:10.65.18.107 launch.baidu.com
./baidu.com:10.36.23.62 live.baidu.com
./baidu.com:10.26.40.19 live.baidu.com
./baidu.com:10.81.45.245 log.baidu.com
./baidu.com:10.26.39.14 log.baidu.com
./baidu.com:10.23.65.13 log02.baidu.com
./baidu.com:10.11.250.228 mirror.baidu.com
./baidu.com:10.26.140.39 ml.baidu.com
./baidu.com:10.81.15.138 monitor.baidu.com
./baidu.com:10.42.7.232 nl.baidu.com
./baidu.com:10.240.31.12 o.baidu.com
./baidu.com:10.26.3.48 ocean.baidu.com
./baidu.com:10.23.240.246 openview.baidu.com
./baidu.com:10.23.65.19 pe.baidu.com
./baidu.com:172.22.1.82 portal.baidu.com
./baidu.com:10.11.0.12 r2.baidu.com
./baidu.com:10.32.10.74 ra.baidu.com
./baidu.com:10.44.31.17 se.baidu.com
./baidu.com:10.42.7.217 security.baidu.com
./baidu.com:10.65.25.83 serv.baidu.com
./baidu.com:10.26.52.14 sms.baidu.com
./baidu.com:10.65.18.22 speed.baidu.com
./baidu.com:10.42.7.217 ssl.baidu.com
./baidu.com:10.46.28.36 tiger.baidu.com
./baidu.com:10.44.66.5 tn.baidu.com
./baidu.com:10.81.11.241 tool.baidu.com
./baidu.com:10.81.11.241 tools.baidu.com
./baidu.com:10.23.1.162 training.baidu.com
./baidu.com:10.23.248.87 ut.baidu.com
./baidu.com:10.48.40.58 va.baidu.com
./baidu.com:10.48.30.87 web.baidu.com
./baidu.com:10.65.19.212 win.baidu.com
./baidu.com:10.42.8.38 work.baidu.com
./baidu.com:10.81.211.74 ws.baidu.com

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