Arch Linux Security Update: Libslirp Information Leak Issue 202012-7

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://security.archlinux.org/CVE-2020-29129
https://security.archlinux.org/CVE-2020-29130