Multiple vulnerabilities in Pulse Connect Secure



Published: 2021-08-05 | Updated: 2021-08-27
Risk Medium
Patch available YES
Number of vulnerabilities 6
CVE-ID CVE-2021-22937
CVE-2021-22933
CVE-2021-22934
CVE-2021-22935
CVE-2021-22936
CVE-2021-22938
CWE-ID CWE-434
CWE-22
CWE-119
CWE-78
CWE-79
Exploitation vector Network
Public exploit Vulnerability #1 is being exploited in the wild.
Vulnerable software
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Pulse Connect Secure
Server applications / Remote access servers, VPN

Vendor Pulse Secure

Security Bulletin

This security bulletin contains information about 6 vulnerabilities.

1) Arbitrary file upload

EUVDB-ID: #VU55617

Risk: Low

CVSSv3.1:

CVE-ID: CVE-2021-22937

CWE-ID: CWE-434 - Unrestricted Upload of File with Dangerous Type

Exploit availability: No

Description

The vulnerability allows a remote user to compromise vulnerable system.

The vulnerability exists due to insufficient validation of file during file upload within the administrative interface. A remote privileged user can upload a malicious archive and execute it on the server.

Note, the vulnerability is being actively exploited in the wild as of August 2021.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Pulse Connect Secure: 9.1R1 - 9.1R11.5


CPE2.3 External links

http://kb.pulsesecure.net/articles/Pulse_Security_Advisories/SA44858/p?pubstatus=o
http://us-cert.cisa.gov/ncas/current-activity/2021/08/24/cisa-releases-five-pulse-secure-related-mars

Q & A

Can this vulnerability be exploited remotely?

How the attacker can exploit this vulnerability?

Is there known malware, which exploits this vulnerability?

2) Path traversal

EUVDB-ID: #VU55618

Risk: Low

CVSSv3.1:

CVE-ID: CVE-2021-22933

CWE-ID: CWE-22 - Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')

Exploit availability: No

Description

The vulnerability allows a remote user to perform directory traversal attacks.

The vulnerability exists due to input validation error when processing directory traversal sequences. A remote privileges user can send a specially crafted HTTP request and delete arbitrary files on the system.

Mitigation

Install update from vendor's website.

Vulnerable software versions

Pulse Connect Secure: 9.1R1 - 9.1R11.5


CPE2.3 External links

http://kb.pulsesecure.net/articles/Pulse_Security_Advisories/SA44858/p?pubstatus=o

Q & A

Can this vulnerability be exploited remotely?

How the attacker can exploit this vulnerability?

Is there known malware, which exploits this vulnerability?

3) Buffer overflow

EUVDB-ID: #VU55619

Risk: Low

CVSSv3.1:

CVE-ID: CVE-2021-22934

CWE-ID: CWE-119 - Improper Restriction of Operations within the Bounds of a Memory Buffer

Exploit availability: No

Description

The vulnerability allows a remote user to execute arbitrary code on the target system.

The vulnerability exists due to a boundary error in a load-balanced configuration. A remote privileges user can create a specially crafted HTTP request to the system, trigger memory corruption and execute arbitrary code on the target system.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Pulse Connect Secure: 9.1R1 - 9.1R11.5


CPE2.3 External links

http://kb.pulsesecure.net/articles/Pulse_Security_Advisories/SA44858/p?pubstatus=o

Q & A

Can this vulnerability be exploited remotely?

How the attacker can exploit this vulnerability?

Is there known malware, which exploits this vulnerability?

4) OS Command Injection

EUVDB-ID: #VU55620

Risk: Low

CVSSv3.1:

CVE-ID: CVE-2021-22935

CWE-ID: CWE-78 - Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')

Exploit availability: No

Description

The vulnerability allows a remote user to execute arbitrary shell commands on the target system.

The vulnerability exists due to improper input validation. A remote privileges user can send a specially crafted HTTP request to the system and execute arbitrary OS commands.


Mitigation

Install updates from vendor's website.

Vulnerable software versions

Pulse Connect Secure: 9.1R1 - 9.1R11.5


CPE2.3 External links

http://kb.pulsesecure.net/articles/Pulse_Security_Advisories/SA44858/p?pubstatus=o

Q & A

Can this vulnerability be exploited remotely?

How the attacker can exploit this vulnerability?

Is there known malware, which exploits this vulnerability?

5) Cross-site scripting

EUVDB-ID: #VU55621

Risk: Medium

CVSSv3.1:

CVE-ID: CVE-2021-22936

CWE-ID: CWE-79 - Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

Exploit availability: No

Description

The disclosed vulnerability allows a remote attacker to perform cross-site scripting (XSS) attacks.

The vulnerability exists due to insufficient sanitization of user-supplied data. A remote attacker can trick the victim to follow a specially crafted link and execute arbitrary HTML and script code in user's browser in context of vulnerable website.

Successful exploitation of this vulnerability may allow a remote attacker to steal potentially sensitive information, change appearance of the web page, perform phishing and drive-by-download attacks.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Pulse Connect Secure: 9.1R1 - 9.1R11.5


CPE2.3 External links

http://kb.pulsesecure.net/articles/Pulse_Security_Advisories/SA44858/p?pubstatus=o

Q & A

Can this vulnerability be exploited remotely?

How the attacker can exploit this vulnerability?

Is there known malware, which exploits this vulnerability?

6) OS Command Injection

EUVDB-ID: #VU55622

Risk: Low

CVSSv3.1:

CVE-ID: CVE-2021-22938

CWE-ID: CWE-78 - Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')

Exploit availability: No

Description

The vulnerability allows a remote user to execute arbitrary shell commands on the target system.

The vulnerability exists due to improper input validation. A remote administrator can send a specially crafted HTTP request to the system and execute arbitrary OS commands.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Pulse Connect Secure: 9.1R1 - 9.1R11.5


CPE2.3 External links

http://kb.pulsesecure.net/articles/Pulse_Security_Advisories/SA44858/p?pubstatus=o

Q & A

Can this vulnerability be exploited remotely?

How the attacker can exploit this vulnerability?

Is there known malware, which exploits this vulnerability?



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