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Bug Security The Internet Apache

Fix For Apache DoS Bug In the Pipes 49

Posted by timothy
from the gurgling-through dept.
Trailrunner7 writes with the report that "The Apache Software Foundation plans to have a fix available in the next day or so [Note: that means today, now. --Ed.] for the denial-of-service problem in Apache that was publicized late last week. The bug, which in some forms has been under discussion for more than four years, involves the way that the Web server handles certain overlapping range headers. The vulnerability is a denial-of-service bug, but it is considered serious because a remote attacker can essentially take a targeted server offline with little effort and resources. The Apache Software Foundation, which maintains the popular open-source Web server, updated its advisory on the vulnerability, saying that it expects to have a full fix available for the vulnerability within the next 24 hours."
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Fix For Apache DoS Bug In the Pipes

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  • by Kickasso (210195) on Saturday August 27, 2011 @09:46AM (#37227164)

    It's a protocol bug. Any server that implements the protocol to the letter is vulnerable. And it's not just about overlapping ranges. If the server can send a ten megabyte file, an attacker can ask it for ten million of one-byte ranges. The processing overhead will bring most servers to their knees. If the server can compress the output, an attacker can ask for ten million of compressed one-byte ranges. An attempt to execute such a request will kill just about anything. The protocol should have limited the number of ranges per request to, say, 10.

It's a poor workman who blames his tools.