[arch-security] [ASA-201503-26] musl: arbitrary code execution

[Remi Gacogne]

Arch Linux Security Advisory ASA-201503-26
==========================================

Severity: Critical
Date    : 2015-03-31
CVE-ID  : CVE-2015-1817
Package : musl
Type    : arbitrary code execution
Remote  : No
Link    : https://wiki.archlinux.org/index.php/CVE

Summary
=======

The package musl before version 1.1.8-1 is vulnerable to arbitrary code
execution.

Resolution
==========

Upgrade to 1.1.8-1.

# pacman -Syu "musl>=1.1.8-1"

The problem has been fixed upstream in version 1.1.8.

Workaround
==========

None.

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

A stack-based buffer overflow has been found in musl libc's ipv6 address
literal parsing code. Programs which call the inet_pton or getaddrinfo
function with AF_INET6 or AF_UNSPEC and untrusted address strings are
affected. Successful exploitation yields control of the return address.
Having enabled stack protector at the application level does not
mitigate the issue.

Impact
======

An attacker can execute arbitrary code by submitting a carefully crafted
IPv6 address to a program linked with musl calling inet_pton() or
getaddrinfo() with AF_INET6 or AF_UNSPEC.

References
==========

http://www.openwall.com/lists/musl/2015/03/30/1
http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2015-1817


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