Vulnerability CVE-2021-21086

Vulnerability Name:

CVE-2021-21086 (CCN-198386)

Assigned:

2020-12-18

Published:

2021-03-17

Updated:

2021-09-10

Summary:

Acrobat Reader DC versions versions 2020.013.20074 (and earlier), 2020.001.30018 (and earlier) and 2017.011.30188 (and earlier) are affected by an Out-of-bounds Write vulnerability in the CoolType library. An unauthenticated attacker could leverage this vulnerability to achieve arbitrary code execution in the context of the current user. Exploitation of this issue requires user interaction in that a victim must open a malicious file.

CVSS v3 Severity:

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

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

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

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

CVSS v2 Severity:

6.8 Medium (CVSS v2 Vector: AV:N/AC:M/Au:N/C:P/I:P/A:P)

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

6.8 Medium (CCN CVSS v2 Vector: AV:L/AC:L/Au:S/C:C/I:C/A:C)

Exploitability Metrics:	Access Vector (AV): Local Access Complexity (AC): Low Athentication (Au): Single_Instance
Impact Metrics:	Confidentiality (C): Complete Integrity (I): Complete Availibility (A): Complete

Vulnerability Type:

CWE-787

Vulnerability Consequences:

Gain Access

References:

Source: MITRE
Type: CNA
CVE-2021-21086

Source: CCN
Type: Google Security Research Issue 2131
Adobe Reader CoolType arbitrary stack manipulation in Type 1/Multiple Master othersubrs 14-18

Source: XF
Type: UNKNOWN
adobe-reader-cve202121086-code-exec(198386)

Source: CCN
Type: Adobe Security Bulletin APSB21-09
Security update available for Adobe Acrobat and Reader

Source: MISC
Type: Vendor Advisory
https://helpx.adobe.com/security/products/acrobat/apsb21-09.html

Source: CCN
Type: Packet Storm Security [03-18-2021]
Adobe Reader CoolType Arbitrary Stack Manipulation

Vulnerable Configuration:

Configuration 1:

cpe:/a:adobe:acrobat:*:*:*:*:classic:*:*:* (Version >= 17.011.30056 and <= 17.011.30188)

OR cpe:/a:adobe:acrobat:*:*:*:*:classic:*:*:* (Version >= 20.001.30005 and <= 20.001.30018)

OR cpe:/a:adobe:acrobat_dc:*:*:*:*:continuous:*:*:* (Version >= 20.006.20042 and <= 20.013.20074)

OR cpe:/a:adobe:acrobat_reader:*:*:*:*:classic:*:*:* (Version >= 17.011.30059 and <= 17.011.30188)

OR cpe:/a:adobe:acrobat_reader:*:*:*:*:classic:*:*:* (Version >= 20.001.30005 and <= 20.001.300183)

OR cpe:/a:adobe:acrobat_reader_dc:*:*:*:*:continuous:*:*:* (Version >= 20.006.20042 and <= 20.013.20074)

AND

cpe:/o:apple:macos:-:*:*:*:*:*:*:*

OR cpe:/o:microsoft:windows:-:*:*:*:*:*:*:*

Denotes that component is vulnerable

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