Subject: [ASA-202012-7] libslirp: information disclosure

Arch Linux Security Advisory ASA-202012-7
=========================================

Severity: Medium
Date    : 2020-12-05
CVE-ID  : CVE-2020-29129 CVE-2020-29130
Package : libslirp
Type    : information disclosure
Remote  : No
Link    : https://security.archlinux.org/AVG-1305

Summary
=======

The package libslirp before version 4.4.0-1 is vulnerable to
information disclosure.

Resolution
==========

Upgrade to 4.4.0-1.

# pacman -Syu "libslirp>=4.4.0-1"

The problems have been fixed upstream in version 4.4.0.

Workaround
==========

None.

Description
===========

- CVE-2020-29129 (information disclosure)

ncsi.c in libslirp through 4.3.1 has a buffer over-read because it
tries to read a certain amount of header data even if that exceeds the
total packet length. A privileged guest user may use this flaw to
potentially leak host information bytes.

- CVE-2020-29130 (information disclosure)

slirp.c in libslirp through 4.3.1 has a buffer over-read because it
tries to read a certain amount of header data even if that exceeds the
total packet length. A privileged guest user may use this flaw to
potentially leak host information bytes.

Impact
======

A privileged guest user may be able to access sensitive information
from the host memory.

References
==========

https://www.openwall.com/lists/oss-security/2020/11/27/1
https://gitlab.freedesktop.org/slirp/libslirp/-/commit/2e1dcbc0c2af64fcb17009eaf2ceedd81be2b27f
https://git.qemu.org/?p=qemu.git;a=commitdiff;h=37c0c885d19a4c2d69faed891b5c02aaffbdccfb
https://security.archlinux.org/CVE-2020-29129
https://security.archlinux.org/CVE-2020-29130