Juniper Junos OS update for cURL



Published: 2021-07-20
Risk Medium
Patch available YES
Number of vulnerabilities 3
CVE-ID CVE-2020-8284
CVE-2020-8286
CVE-2020-8285
CWE-ID CWE-200
CWE-299
CWE-674
Exploitation vector Network
Public exploit N/A
Vulnerable software
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Juniper Junos OS
Operating systems & Components / Operating system

Junos OS Evolved
Operating systems & Components / Operating system

Vendor Juniper Networks, Inc.

Security Bulletin

This security bulletin contains information about 3 vulnerabilities.

1) Information disclosure

EUVDB-ID: #VU48893

Risk: Medium

CVSSv3.1:

CVE-ID: CVE-2020-8284

CWE-ID: CWE-200 - Information Exposure

Exploit availability: No

Description

The vulnerability allows a remote attacker to gain access to potentially sensitive information.

The vulnerability exists due to the way cURL handles PASV responses. A remote attacker with control over malicious FTP server can use the PASV response to trick curl into connecting back to a given IP address and port, and this way potentially make curl extract information about services that are otherwise private and not disclosed, for example doing port scanning and service banner extractions.

Mitigation

Install update from vendor's website.

Vulnerable software versions

Juniper Junos OS: before 20.1R2-S2

Junos OS Evolved: before 21.1R1-EVO


CPE2.3
External links

http://kb.juniper.net/InfoCenter/index?page=content&id=JSA11207&cat=SIRT_1&actp=LIST

Q & A

Can this vulnerability be exploited remotely?

Is there known malware, which exploits this vulnerability?

2) Improper Check for Certificate Revocation

EUVDB-ID: #VU48895

Risk: Medium

CVSSv3.1:

CVE-ID: CVE-2020-8286

CWE-ID: CWE-299 - Improper Check for Certificate Revocation

Exploit availability: No

Description

The vulnerability allows a remote attacker to bypass implemented security restrictions.

The vulnerability exists due to incorrectly implemented checks for OCSP stapling. A remote attacker can provide a fraudulent OCSP response that would appear fine, instead of the real one.

Mitigation

Install update from vendor's website.

Vulnerable software versions

Juniper Junos OS: before 20.1R2-S2

Junos OS Evolved: before 21.1R1-EVO


CPE2.3
External links

http://kb.juniper.net/InfoCenter/index?page=content&id=JSA11207&cat=SIRT_1&actp=LIST

Q & A

Can this vulnerability be exploited remotely?

Is there known malware, which exploits this vulnerability?

3) Uncontrolled Recursion

EUVDB-ID: #VU48894

Risk: Low

CVSSv3.1:

CVE-ID: CVE-2020-8285

CWE-ID: CWE-674 - Uncontrolled Recursion

Exploit availability: No

Description

The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.

The vulnerability exists due tu uncontrolled recursion when processing FTP responses within the wildcard matching functionality, which allows a callback (set with <a href="https://curl.se/libcurl/c/CURLOPT_CHUNK_BGN_FUNCTION.html">CURLOPT_CHUNK_BGN_FUNCTION</a>) to return information back to libcurl on how to handle a specific entry in a directory when libcurl iterates over a list of all available entries. A remote attacker who controls the malicious FTP server can trick the victim to connect to it and crash the application, which is using the affected libcurl version.

Mitigation

Install update from vendor's website.

Vulnerable software versions

Juniper Junos OS: before 20.1R2-S2

Junos OS Evolved: before 21.1R1-EVO


CPE2.3
External links

http://kb.juniper.net/InfoCenter/index?page=content&id=JSA11207&cat=SIRT_1&actp=LIST

Q & A

Can this vulnerability be exploited remotely?

Is there known malware, which exploits this vulnerability?



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