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Bug 680834 (CVE-2019-9824)

Summary: <app-emulation/qemu-3.1.0-r4: Slirp: information leakage in tcp_emu() due to uninitialized stack
Product: Gentoo Security Reporter: Agostino Sarubbo <ago>
Component: VulnerabilitiesAssignee: Gentoo Security <security>
Severity: minor CC: tamiko, virtualization
Priority: Normal    
Version: unspecified   
Hardware: All   
OS: Linux   
Whiteboard: B4 [glsa+ cve]
Package list:
Runtime testing required: ---
Bug Depends on:    
Bug Blocks: 681850    

Description Agostino Sarubbo gentoo-dev 2019-03-18 07:39:45 UTC
From ${URL} :

An information leakage issue was found in the SLiRP networking implementation 
of the QEMU emulator. It occurs in tcp_emu() routine while emulating 
Identification protocol, when crafted messages are sent to make it return 
uninitialized variables.

A user/process could use this flaw to read uninitialised stack memory contents 
from the QEMU process resulting in information leakage.

Upstream patch:

@maintainer(s): after the bump, in case we need to stabilize the package, please let us know if it is ready for the stabilization or not.
Comment 1 Larry the Git Cow gentoo-dev 2019-04-08 02:52:25 UTC
The bug has been referenced in the following commit(s):

commit 6fec2a540ce3e7cbd378287ee2837aeba6406eaf
Author:     Matthias Maier <>
AuthorDate: 2019-04-08 02:26:43 +0000
Commit:     Matthias Maier <>
CommitDate: 2019-04-08 02:51:08 +0000

    app-emulation/qemu: multiple security fixes for 3.1.0
    Package-Manager: Portage-2.3.62, Repoman-2.3.12
    Signed-off-by: Matthias Maier <>

 app-emulation/qemu/Manifest             | 1 +
 app-emulation/qemu/qemu-3.1.0-r4.ebuild | 6 ++----
 2 files changed, 3 insertions(+), 4 deletions(-)
Comment 2 GLSAMaker/CVETool Bot gentoo-dev 2019-04-25 00:00:32 UTC
This issue was resolved and addressed in
 GLSA 201904-25 at
by GLSA coordinator Aaron Bauman (b-man).