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Bug 1637570 - (CVE-2018-18065) CVE-2018-18065 net-snmp: NULL pointer exception in _set_key in agent/helpers/table_container.c resulting in a denial of service
CVE-2018-18065 net-snmp: NULL pointer exception in _set_key in agent/helpers/...
Status: CLOSED NOTABUG
Product: Security Response
Classification: Other
Component: vulnerability (Show other bugs)
unspecified
All Linux
medium Severity medium
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Assigned To: Red Hat Product Security
impact=moderate,public=20161006,repor...
: Security
Depends On: 1637573
Blocks: 1637575
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Reported: 2018-10-09 09:50 EDT by Andrej Nemec
Modified: 2018-10-12 13:05 EDT (History)
12 users (show)

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Fixed In Version: net-snmp 5.8
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Last Closed: 2018-10-12 13:05:25 EDT
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Description Andrej Nemec 2018-10-09 09:50:54 EDT 
It was found that _set_key in agent/helpers/table_container.c in Net-SNMP before 5.8 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.

References:

https://dumpco.re/blog/net-snmp-5.7.3-remote-dos

Upstream patch:

https://sourceforge.net/p/net-snmp/code/ci/7ffb8e25a0db851953155de91f0170e9bf8c457d/
Comment 1 Andrej Nemec 2018-10-09 09:59:13 EDT 
Created net-snmp tracking bugs for this issue:

Affects: fedora-all [bug 1637573]
Comment 2 Scott Gayou 2018-10-11 15:59:46 EDT 
Unable to reproduce on any version of RHEL using instructions. This appears to be a duplicate of CVE-2015-5621. See the reference page for those details. "Update: "vuln1" was assigned CVE-2015-5621 (see references), therefore CVE-2018-18066 has been marked as duplicate."

This looks to have been patched in RHEL6 and RHEL7 at least via https://bugzilla.redhat.com/show_bug.cgi?id=1212408. I expected that it would trigger on RHEL5 at least, but it does not.
Comment 3 Scott Gayou 2018-10-11 16:09:34 EDT 
More notes about duplicate CVE:

https://seclists.org/oss-sec/2018/q4/38
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