Vulnerability CVE-2018-6548

Vulnerability Name:

CVE-2018-6548 (CCN-138609)

Assigned:

2018-02-02

Published:

2018-02-02

Updated:

2018-02-21

Summary:

A use-after-free issue was discovered in libwebm through 2018-02-02. If a Vp9HeaderParser was initialized once before, its property frame_ would not be changed because of code in vp9parser::Vp9HeaderParser::SetFrame. Its frame_ could be freed while the corresponding pointer would not be updated, leading to a dangling pointer. This is related to the function OutputCluster in webm_info.cc.

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)
8.6 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:U/RC:R)

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

7.3 High (CCN CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L)
6.4 Medium (CCN Temporal CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L/E:U/RL:U/RC:R)

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): Low Integrity (I): Low 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

7.5 High (CCN 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 Athentication (Au): None
Impact Metrics:	Confidentiality (C): Partial Integrity (I): Partial Availibility (A): Partial

Vulnerability Type:

CWE-416

Vulnerability Consequences:

Gain Access

References:

Source: MITRE
Type: CNA
CVE-2018-6548

Source: MISC
Type: Permissions Required
https://bugs.chromium.org/p/webm/issues/detail?id=1493

Source: XF
Type: UNKNOWN
libwebm-cve20186548-code-exec(138609)

Source: CCN
Type: GitHub Web site
libwebm Vp9HeaderParser UAF by PrintVP9Info

Source: MISC
Type: Exploit, Third Party Advisory
https://github.com/dwfault/PoCs/blob/master/libwebm%20Vp9HeaderParser%20UAF%20by%20PrintVP9Info/libwebm%20Vp9HeaderParser%20UAF%20by%20PrintVP9Info.md

Source: CCN
Type: libwebm GIT Repostiroy
libwebm

Vulnerable Configuration:

Configuration 1:

cpe:/a:webmproject:libwebm:*:*:*:*:*:*:*:* (Version <= 1.0.0.27)

Denotes that component is vulnerable

Oval Definitions

Definition ID	Class	Title	Last Modified
oval:com.ubuntu.xenial:def:201865480000000	V	CVE-2018-6548 on Ubuntu 16.04 LTS (xenial) - medium.	2018-02-02
oval:com.ubuntu.artful:def:20186548000	V	CVE-2018-6548 on Ubuntu 17.10 (artful) - medium.	2018-02-02
oval:com.ubuntu.xenial:def:20186548000	V	CVE-2018-6548 on Ubuntu 16.04 LTS (xenial) - medium.	2018-02-02
oval:com.ubuntu.bionic:def:20186548000	V	CVE-2018-6548 on Ubuntu 18.04 LTS (bionic) - medium.	2018-02-02
oval:com.ubuntu.cosmic:def:201865480000000	V	CVE-2018-6548 on Ubuntu 18.10 (cosmic) - medium.	2018-02-02
oval:com.ubuntu.cosmic:def:20186548000	V	CVE-2018-6548 on Ubuntu 18.10 (cosmic) - medium.	2018-02-02
oval:com.ubuntu.bionic:def:201865480000000	V	CVE-2018-6548 on Ubuntu 18.04 LTS (bionic) - medium.	2018-02-02
oval:com.ubuntu.trusty:def:20186548000	V	CVE-2018-6548 on Ubuntu 14.04 LTS (trusty) - medium.	2018-02-02

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