Openwall GNU/*/Linux - a small security-enhanced Linux distro for servers
[<prev] [next>] [<thread-prev] [day] [month] [year] [list]
Date: Tue, 18 Dec 2018 16:44:07 +0530 (IST)
From: P J P <ppandit@...hat.com>
To: saar amar <saaramar5@...il.com>
cc: oss security list <oss-security@...ts.openwall.com>
Subject: Re: CVE-2018-20124 QEMU: rdma: OOB access when building scatter-gather
 array

+-- On Tue, 18 Dec 2018, saar amar wrote --+
| I'm wondering why it says "DOS" and not "execute arbitrary code on the host, 
| in the context of the QEMU process"? I have stack overflow, it pretty clear 
| I could gain more than simple DOS:)
| 
| What do your day?

IIUC, it's likely to corrupt adjacent stack variables and/or hit stack canary 
resulting in DoS. The scatter/gather entry object(struct ibv_sge) holds buffer 
address/length attributes used during r/w operations. If their values are 
astray, the following call to ibv_post_send() may suffer/return an error.

Thank you.
--
Prasad J Pandit / Red Hat Product Security Team
47AF CE69 3A90 54AA 9045 1053 DD13 3D32 FE5B 041F

Powered by blists - more mailing lists

Your e-mail address:

Please check out the Open Source Software Security Wiki, which is counterpart to this mailing list.

Confused about mailing lists and their use? Read about mailing lists on Wikipedia and check out these guidelines on proper formatting of your messages.