Subject: [ASA-201802-5] sthttpd: arbitrary code execution

Arch Linux Security Advisory ASA-201802-5
=========================================

Severity: High
Date    : 2018-02-09
CVE-ID  : CVE-2017-10671
Package : sthttpd
Type    : arbitrary code execution
Remote  : Yes
Link    : https://security.archlinux.org/AVG-333

Summary
=======

The package sthttpd before version 2.27.1-1 is vulnerable to arbitrary
code execution.

Resolution
==========

Upgrade to 2.27.1-1.

# pacman -Syu "sthttpd>=2.27.1-1"

The problem has been fixed upstream in version 2.27.1.

Workaround
==========

None.

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

Heap-based Buffer Overflow in the de_dotdot function in libhttpd.c in
sthttpd before 2.27.1 allows remote attackers to cause a denial of
service (daemon crash) or possibly execute arbitrary code via a crafted
filename.

Impact
======

A remote attacker is able to crash and possibly execute arbitrary code
on the server by requesting a maliciously-crafted request.

References
==========

https://github.com/blueness/sthttpd/commit/c0dc63a49d8605649f1d8e4a96c9b468b0bff660
http://seclists.org/oss-sec/2017/q2/481
https://security.archlinux.org/CVE-2017-10671