Vulnerability CVE-2018-6836

Vulnerability Name:

CVE-2018-6836 (CCN-138914)

Assigned:

2018-02-07

Published:

2018-02-07

Updated:

2020-08-24

Summary:

The netmonrec_comment_destroy function in wiretap/netmon.c in Wireshark through 2.4.4 performs a free operation on an uninitialized memory address, which allows remote attackers to cause a denial of service (application crash) or possibly have unspecified other impact.

CVSS v3 Severity:

9.8 Critical (CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H)
8.5 High (Temporal CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C)

Exploitability Metrics:	Attack Vector (AV): Network Attack Complexity (AC): Low Privileges Required (PR): None User Interaction (UI): None
Scope:	Scope (S): Unchanged
Impact Metrics:	Confidentiality (C): High Integrity (I): High Availibility (A): High

5.3 Medium (CCN CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L)
4.6 Medium (CCN Temporal CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L/E:U/RL:O/RC:C)

Exploitability Metrics:	Attack Vector (AV): Network Attack Complexity (AC): Low Privileges Required (PR): None User Interaction (UI): None
Scope:	Scope (S): Unchanged
Impact Metrics:	Confidentiality (C): None Integrity (I): None Availibility (A): Low

CVSS v2 Severity:

7.5 High (CVSS v2 Vector: AV:N/AC:L/Au:N/C:P/I:P/A:P)

Exploitability Metrics:	Access Vector (AV): Network Access Complexity (AC): Low Authentication (Au): None
Impact Metrics:	Confidentiality (C): Partial Integrity (I): Partial Availibility (A): Partial

5.0 Medium (CCN CVSS v2 Vector: AV:N/AC:L/Au:N/C:N/I:N/A:P)

Exploitability Metrics:	Access Vector (AV): Network Access Complexity (AC): Low Athentication (Au): None
Impact Metrics:	Confidentiality (C): None Integrity (I): None Availibility (A): Partial

Vulnerability Type:

CWE-763

Vulnerability Consequences:

Denial of Service

References:

Source: MITRE
Type: CNA
CVE-2018-6836

Source: CCN
Type: Wireshark Bug Database Bug 14397
Illegal memory access from running free() on an invalid address triggered by parsing crafted pcap

Source: MISC
Type: Exploit, Issue Tracking, Third Party Advisory
https://bugs.wireshark.org/bugzilla/show_bug.cgi?id=14397

Source: MISC
Type: Issue Tracking, Patch
https://code.wireshark.org/review/#/c/25660/

Source: MISC
Type: Patch
https://code.wireshark.org/review/#/c/25660/2/wiretap/netmon.c

Source: MISC
Type: Issue Tracking, Patch
https://code.wireshark.org/review/gitweb?p=wireshark.git;a=commit;h=28960d79cca262ac6b974f339697b299a1e28fef

Source: XF
Type: UNKNOWN
wireshark-cve20186836-dos(138914)

Source: CCN
Type: Wireshark Web site
Wireshark

Vulnerable Configuration:

Configuration 1:

cpe:/a:wireshark:wireshark:*:*:*:*:*:*:*:* (Version <= 2.4.4)

Configuration CCN 1:

cpe:/a:wireshark:wireshark:2.4.4:*:*:*:*:*:*:*

Denotes that component is vulnerable

Oval Definitions

Definition ID	Class	Title	Last Modified
oval:com.ubuntu.artful:def:20186836000	V	CVE-2018-6836 on Ubuntu 17.10 (artful) - untriaged.	2018-02-08
oval:com.ubuntu.bionic:def:201868360000000	V	CVE-2018-6836 on Ubuntu 18.04 LTS (bionic) - untriaged.	2018-02-08
oval:com.ubuntu.bionic:def:20186836000	V	CVE-2018-6836 on Ubuntu 18.04 LTS (bionic) - untriaged.	2018-02-08
oval:com.ubuntu.xenial:def:201868360000000	V	CVE-2018-6836 on Ubuntu 16.04 LTS (xenial) - untriaged.	2018-02-08
oval:com.ubuntu.trusty:def:20186836000	V	CVE-2018-6836 on Ubuntu 14.04 LTS (trusty) - untriaged.	2018-02-08
oval:com.ubuntu.xenial:def:20186836000	V	CVE-2018-6836 on Ubuntu 16.04 LTS (xenial) - untriaged.	2018-02-08

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