Bug 1734745 (CVE-2019-14378) - CVE-2019-14378 QEMU: slirp: heap buffer overflow during packet reassembly
Summary: CVE-2019-14378 QEMU: slirp: heap buffer overflow during packet reassembly
Keywords:
Status: NEW
Alias: CVE-2019-14378
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
high
high
Target Milestone: ---
Assignee: Red Hat Product Security
QA Contact:
URL:
Whiteboard: impact=important,public=20190728,repo...
Depends On: 1734747 1734748 1734749 1734750 1734751 1734752 1734753 1734754 1734755 1735477 1735478 1735479 1735652 1735653 1735654
Blocks: 1727851
TreeView+ depends on / blocked
 
Reported: 2019-07-31 11:07 UTC by Prasad J Pandit
Modified: 2019-08-07 04:11 UTC (History)
37 users (show)

Fixed In Version:
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Doc Text:
A heap buffer overflow issue was found in the SLiRP networking implementation of the QEMU emulator. This flaw occurs in the ip_reass() routine while reassembling incoming packets if the first fragment is bigger than the m->m_dat[] buffer. An attacker could use this flaw to crash the QEMU process on the host, resulting in a Denial of Service or potentially executing arbitrary code with privileges of the QEMU process.
Clone Of:
Environment:
Last Closed:


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Description Prasad J Pandit 2019-07-31 11:07:55 UTC
A heap buffer overflow issue was found in the SLiRP networking implementation
of the QEMU emulator. It occurs in ip_reass() routine while reassembling
incoming packets, if the first fragment is bigger than the m->m_dat[] buffer. 

A user/process could use this flaw to crash the Qemu process on the host
resulting in DoS or potentially execute arbitrary code with privileges of the 
QEMU process.

Upstream patch:
---------------
  -> https://gitlab.freedesktop.org/slirp/libslirp/commit/126c04acbabd7ad32c2b018fe10dfac2a3bc1210

Reference:
----------
  -> https://www.openwall.com/lists/oss-security/2019/08/01/2

Comment 1 Prasad J Pandit 2019-07-31 11:08:03 UTC
Acknowledgments:

Name: Vishnu Dev

Comment 7 Prasad J Pandit 2019-08-01 08:11:02 UTC
Created qemu tracking bugs for this issue:

Affects: fedora-all [bug 1735654]

Comment 10 Summer Long 2019-08-05 04:42:35 UTC
Statement:

Red Hat OpenStack Platform:                                                                                                                 
* This flaw impacts KVM user-mode or SLIRP networking, which is not used in Red Hat OpenStack Platform. Although updating is recommended for affected versions (see below), Red Hat OpenStack Platform environments are not vulnerable.
* Because the flaw's impact is Low, it will not be fixed in Red Hat OpenStack Platform 9 which is retiring within a few weeks of the flaw's public date.

Comment 12 Prasad J Pandit 2019-08-07 04:11:22 UTC
Mitigation:

There is no external mitigation to prevent this out-of-bounds heap memory access.


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