Vulnerability CVE-2021-21089

Vulnerability Name:

CVE-2021-21089 (CCN-198388)

Assigned:

2020-12-18

Published:

2021-03-17

Updated:

2021-10-08

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 Read vulnerability. An unauthenticated attacker could leverage this vulnerability to locally escalate privileges 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:

3.3 Low (CVSS v3.1 Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N)
2.9 Low (Temporal CVSS v3.1 Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N/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): Low Integrity (I): None Availibility (A): None

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:

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

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

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-125

Vulnerability Consequences:

Gain Privileges

References:

Source: MITRE
Type: CNA
CVE-2021-21089

Source: XF
Type: UNKNOWN
adobe-reader-cve202121089-priv-esc(198388)

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

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

Source: CCN
Type: ZDI-21-336
Adobe Acrobat Reader DC URI Parsing Out-Of-Bounds Read Information Disclosure Vulnerability

Vulnerable Configuration:

Configuration 1:

cpe:/a:adobe:acrobat_dc:*:*:*:*:continuous:*:*:* (Version >= 20.006.20034 and <= 20.013.20074)

OR cpe:/a:adobe:acrobat_reader_dc:*:*:*:*:continuous:*:*:* (Version >= 20.006.20034 and <= 20.013.20074)

AND

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

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

Configuration 2:

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

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

AND

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

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

Configuration 3:

cpe:/a:adobe:acrobat_dc:*:*:*:*:classic:*:*:* (Version >= 17.011.30158 and <= 17.011.30188)

OR cpe:/a:adobe:acrobat_reader_dc:*:*:*:*:classic:*:*:* (Version >= 17.011.30158 and <= 17.011.30188)

AND

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

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

Denotes that component is vulnerable

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