Multiple vulnerabilities in Adobe Reader and Acrobat

1) Out-of-bounds read

EUVDB-ID: #VU53921

Risk: High

CVSSv3.1: 7.7 [CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2021-28554

CWE-ID: CWE-125 - Out-of-bounds read

Exploit availability: No

Description

The vulnerability allows a remote attacker to compromise the affected system.

The vulnerability exists due to a boundary condition when processing relative paths. A remote attacker can create a specially crafted PDF file, trick the victim into opening it, trigger out-of-bounds read error and compromise the affected system.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Adobe Reader: 21.001.20135 - 2020.013.20074

Adobe Acrobat: 17.008.30051 - 21.001.20155

CPE2.3

External links

http://helpx.adobe.com/security/products/acrobat/apsb21-37.html
http://www.zerodayinitiative.com/advisories/ZDI-21-659/

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

How the attacker can exploit this vulnerability?

The attacker would have to trick the victim to visit a specially crafted website or open a file.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.

2) Out-of-bounds read

EUVDB-ID: #VU53922

Risk: High

CVSSv3.1: 7.7 [CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2021-28551

CWE-ID: CWE-125 - Out-of-bounds read

Exploit availability: No

Description

The vulnerability allows a remote attacker to compromise the affected system.

The vulnerability exists due to a boundary condition. A remote attacker can create a specially crafted PDF file, trick the victim into opening it, trigger out-of-bounds read error and compromise the affected system.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Adobe Reader: 21.001.20135 - 2020.013.20074

Adobe Acrobat: 17.008.30051 - 21.001.20155

CPE2.3

External links

http://helpx.adobe.com/security/products/acrobat/apsb21-37.html

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

How the attacker can exploit this vulnerability?

The attacker would have to trick the victim to visit a specially crafted website or open a file.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.

3) Use-after-free

EUVDB-ID: #VU53923

Risk: High

CVSSv3.1: 7.7 [CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2021-28552

CWE-ID: CWE-416 - Use After Free

Exploit availability: No

Description

The vulnerability allows a remote attacker to compromise the affected system.

The vulnerability exists due to a boundary condition when processing XFA templates. A remote attacker can create a specially crafted PDF file, trick the victim into opening it, trigger a use-after-free error and compromise the affected system.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Adobe Reader: 21.001.20135 - 2020.013.20074

Adobe Acrobat: 17.008.30051 - 21.001.20155

CPE2.3

External links

http://helpx.adobe.com/security/products/acrobat/apsb21-37.html
http://www.zerodayinitiative.com/advisories/ZDI-21-661/

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

How the attacker can exploit this vulnerability?

The attacker would have to trick the victim to visit a specially crafted website or open a file.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.

4) Use-after-free

EUVDB-ID: #VU53924

Risk: High

CVSSv3.1: 7.7 [CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2021-28631

CWE-ID: CWE-416 - Use After Free

Exploit availability: No

Description

The vulnerability allows a remote attacker to compromise the affected system.

The vulnerability exists due to a boundary condition when processing AcroForm fields. A remote attacker can create a specially crafted PDF file, trick the victim into opening it, trigger a use-after-free error and compromise the affected system.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Adobe Reader: 21.001.20135 - 2020.013.20074

Adobe Acrobat: 17.008.30051 - 21.001.20155

CPE2.3

External links

http://helpx.adobe.com/security/products/acrobat/apsb21-37.html
http://www.zerodayinitiative.com/advisories/ZDI-21-662/

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

How the attacker can exploit this vulnerability?

The attacker would have to trick the victim to visit a specially crafted website or open a file.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.

5) Use-after-free

EUVDB-ID: #VU53925

Risk: High

CVSSv3.1: 7.7 [CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2021-28632

CWE-ID: CWE-416 - Use After Free

Exploit availability: No

Description

The vulnerability allows a remote attacker to compromise the affected system.

The vulnerability exists due to a boundary condition when processing AcroForm fields. A remote attacker can create a specially crafted PDF file, trick the victim into opening it, trigger a use-after-free error and compromise the affected system.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Adobe Reader: 21.001.20135 - 2020.013.20074

Adobe Acrobat: 17.008.30051 - 21.001.20155

CPE2.3

External links

http://helpx.adobe.com/security/products/acrobat/apsb21-37.html
http://www.zerodayinitiative.com/advisories/ZDI-21-663/

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

How the attacker can exploit this vulnerability?

The attacker would have to trick the victim to visit a specially crafted website or open a file.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.

Risk	High
Patch available	YES
Number of vulnerabilities	5
CVE-ID	CVE-2021-28554 CVE-2021-28551 CVE-2021-28552 CVE-2021-28631 CVE-2021-28632
CWE-ID	CWE-125 CWE-416
Exploitation vector	Network
Public exploit	N/A
Vulnerable software	Adobe Reader Client/Desktop applications / Office applications Adobe Acrobat Client/Desktop applications / Office applications
Vendor	Adobe