[ASA-201810-11] net-snmp: multiple issues

[Levente Polyak]

Arch Linux Security Advisory ASA-201810-11
==========================================

Severity: High
Date    : 2018-10-17
CVE-ID  : CVE-2015-5621 CVE-2018-18065
Package : net-snmp
Type    : multiple issues
Remote  : Yes
Link    : https://security.archlinux.org/AVG-777

Summary
=======

The package net-snmp before version 5.8-1 is vulnerable to multiple
issues including arbitrary code execution and denial of service.

Resolution
==========

Upgrade to 5.8-1.

# pacman -Syu "net-snmp>=5.8-1"

The problems have been fixed upstream in version 5.8.

Workaround
==========

None.

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

- CVE-2015-5621 (arbitrary code execution)

It was discovered that in net-snmp before 5.8 the snmp_pdu_parse()
function could leave incompletely parsed varBind variables in the list
of variables. A remote, unauthenticated attacker could use this flaw to
crash snmpd or potentially execute arbitrary code on the system with
the privileges of the user running snmpd.

- CVE-2018-18065 (denial of service)

A denial of service vulnerability has been discovered in net-snmp
before 5.8. The _set_key function in agent/helpers/table_container.c
has a NULL pointer exception bug that can be used by an authenticated
attacker to remotely cause the instance to crash via a crafted UDP
packet, resulting in denial of service.

Impact
======

A remote unauthenticated attacker is able to crash snmpd or potentially
execute arbitrary code on the system by sending specially crafted
packets.

References
==========

https://seclists.org/oss-sec/2018/q4/24
https://sourceforge.net/p/net-snmp/bugs/2615/
https://sourceforge.net/p/net-snmp/code/ci/f23bcd3ac6ddee5d0a48f9703007ccc738914791
https://www.openwall.com/lists/oss-security/2015/04/13/1
https://bugzilla.redhat.com/show_bug.cgi?id=1212408
https://sourceforge.net/p/net-snmp/bugs/2743/
https://sourceforge.net/p/net-snmp/code/ci/7ffb8e25a0db851953155de91f0170e9bf8c457d
https://dumpco.re/blog/net-snmp-5.7.3-remote-dos
https://security.archlinux.org/CVE-2015-5621
https://security.archlinux.org/CVE-2018-18065

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