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Category:   Application (Web Server/CGI)  >   nginx Vendors:   nginx.org
nginx Null Pointer Dereference in ngx_chain_to_iovec() Lets Remote Users Deny Service
SecurityTracker Alert ID:  1036019
SecurityTracker URL:  http://securitytracker.com/id/1036019
CVE Reference:   CVE-2016-4450   (Links to External Site)
Date:  Jun 2 2016
Impact:   Denial of service via network
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): 1.3.9 - 1.11.0
Description:   A vulnerability was reported in nginx. A remote user can cause denial of service conditions on the target system.

A remote user can send specially crafted data to trigger a null pointer dereference in the ngx_chain_to_iovec() function when saving the client request body to a temporary file and cause a worker process to crash.

Impact:   A remote user can cause a worker process to crash.
Solution:   The vendor has issued a fix (1.10.1, 1.11.1).

The vendor's advisory is available at:

http://mailman.nginx.org/pipermail/nginx-announce/2016/000179.html

Vendor URL:  nginx.org/ (Links to External Site)
Cause:   Access control error
Underlying OS:  Linux (Any)

Message History:   This archive entry has one or more follow-up message(s) listed below.
Jun 2 2016 (Ubuntu Issues Fix) nginx Null Pointer Dereference in ngx_chain_to_iovec() Lets Remote Users Deny Service
Ubuntu has issued a fix for Ubuntu Linux 14.04 LTS, 15.10, and 16.04 LTS.
Jul 14 2016 (Red Hat Issues Fix) nginx Null Pointer Dereference in ngx_chain_to_iovec() Lets Remote Users Deny Service
Red Hat has issued a fix for Red Hat Enterprise Linux 6, 6.6, 6.7, 7, 7.1, and 7.2.



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