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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2021.3035.2 PAN-OS Vulnerabilities 14 September 2021 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: PAN-OS Publisher: Palo Alto Operating System: Network Appliance Impact/Access: Execute Arbitrary Code/Commands -- Remote/Unauthenticated Root Compromise -- Existing Account Denial of Service -- Remote/Unauthenticated Cross-site Scripting -- Existing Account Access Confidential Data -- Remote/Unauthenticated Resolution: Patch/Upgrade CVE Names: CVE-2021-3055 CVE-2021-3054 CVE-2021-3053 CVE-2021-3052 CVE-2020-10188 Reference: ESB-2021.2941 ESB-2021.2843 ESB-2021.2556 Original Bulletin: https://securityadvisories.paloaltonetworks.com/CVE-2020-10188 https://securityadvisories.paloaltonetworks.com/CVE-2021-3052 https://securityadvisories.paloaltonetworks.com/CVE-2021-3053 https://securityadvisories.paloaltonetworks.com/CVE-2021-3054 https://securityadvisories.paloaltonetworks.com/CVE-2021-3055 Revision History: September 14 2021: Vendor added threat prevention workaround for the vulnerabilities September 9 2021: Initial Release - --------------------------BEGIN INCLUDED TEXT-------------------- Palo Alto Networks Security Advisories / CVE-2020-10188 CVE-2020-10188 PAN-OS: Impact of Telnet Remote-Code-Execution (RCE) Vulnerability (CVE-2020-10188) 047910 Severity 8.1 . HIGH Attack Vector NETWORK Attack Complexity HIGH Privileges Required NONE User Interaction NONE Scope UNCHANGED Confidentiality Impact HIGH Integrity Impact HIGH Availability Impact HIGH NVD JSON Published 2021-09-08 Updated 2021-09-08 Reference PAN-158262 Discovered externally Description A buffer overflow vulnerability in the Telnet-based administrative management service included with PAN-OS software allows remote attackers to execute arbitrary code. The Telnet-based administrative management service is disabled by default and this issue is not exploitable if this service is disabled. This issue does not impact SSH or HTTPS management interfaces. This issue does not affect Prisma Access. Product Status Versions Affected Unaffected PAN-OS 10.1 None 10.1.* PAN-OS 10.0 < 10.0.6 >= 10.0.6 PAN-OS 9.1 < 9.1.9 >= 9.1.9 PAN-OS 9.0 < 9.0.14 >= 9.0.14 PAN-OS 8.1 < 8.1.20 >= 8.1.20 Required Configuration for Exposure This issue is exploitable only if the Telnet service is enabled and is accessible to attackers. Severity: HIGH CVSSv3.1 Base Score: 8.1 (CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H) Exploitation Status Palo Alto Networks is not aware of any malicious exploitation of this issue targeting Palo Alto Networks products. Weakness Type CWE-120 Buffer Overflow Solution This issue is fixed in PAN-OS 8.1.20, PAN-OS 9.0.14, PAN-OS 9.1.9, PAN-OS 10.0.6, and all later PAN-OS versions. Workarounds and Mitigations Disabling the Telnet-based administrative management service completely eliminates risks of exploitation of this issue. This issue requires the attacker to have network access to the PAN-OS Telnet interface. You can mitigate the impact of this issue by following best practices for securing the PAN-OS web interface. Please review the Best Practices for Securing Administrative Access in the PAN-OS technical documentation at https://docs.paloaltonetworks.com/best-practices. If the Telnet-based administrative management service is required and you cannot immediately upgrade your PAN-OS software, enable signatures for Unique Threat ID 59125 on traffic destined for the Telnet interface to block attacks against CVE-2020-10188. Acknowledgments This issue was found by an external researcher in the upstream Telnet code. Timeline 2021-09-08 Initial publication Terms of usePrivacyProduct Security Assurance and Vulnerability Disclosure Policy Report vulnerabilitiesManage subscriptions (C) 2020 Palo Alto Networks, Inc. All rights reserved. - -------------------------------------------------------------------------------- Palo Alto Networks Security Advisories / CVE-2021-3052 CVE-2021-3052 PAN-OS: Reflected Cross-Site Scripting (XSS) in Web Interface 047910 Severity 8 . HIGH Attack Vector NETWORK Attack Complexity LOW Privileges Required LOW User Interaction REQUIRED Scope UNCHANGED Confidentiality Impact HIGH Integrity Impact HIGH Availability Impact HIGH NVD JSON Published 2021-09-08 Updated 2021-09-13 Reference PAN-150337 Discovered externally Description A reflected cross-site scripting (XSS) vulnerability in the Palo Alto Network PAN-OS web interface enables an authenticated network-based attacker to mislead another authenticated PAN-OS administrator to click on a specially crafted link that performs arbitrary actions in the PAN-OS web interface as the targeted authenticated administrator. This issue impacts: PAN-OS 8.1 versions earlier than 8.1.20; PAN-OS 9.0 versions earlier than 9.0.14; PAN-OS 9.1 versions earlier than 9.1.10; PAN-OS 10.0 versions earlier than 10.0.2. This issue does not affect Prisma Access. Product Status Versions Affected Unaffected PAN-OS 10.1 None 10.1.* PAN-OS 10.0 < 10.0.2 >= 10.0.2 PAN-OS 9.1 < 9.1.10 >= 9.1.10 PAN-OS 9.0 < 9.0.14 >= 9.0.14 PAN-OS 8.1 < 8.1.20 >= 8.1.20 Severity: HIGH CVSSv3.1 Base Score: 8 (CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H) Exploitation Status Palo Alto Networks is not aware of any malicious attempts to exploit this vulnerability. Weakness Type CWE-79 Cross-site Scripting (XSS) Solution This issue is fixed in PAN-OS 9.0.14, PAN-OS 8.1.20, PAN-OS 9.1.10, PAN-OS 10.0.2, PAN-OS 10.1.0, and all later PAN-OS versions. Workarounds and Mitigations Enable signatures for Unique Threat IDs 91573, 91574, 91575, 91576 on traffic destined for the web interface to block attacks against CVE-2021-3052. This issue requires the attacker to have authenticated access to the PAN-OS web interface. You can mitigate the impact of this issue by following best practices for securing the PAN-OS web interface. Please review the Best Practices for Securing Administrative Access in the PAN-OS technical documentation at https://docs.paloaltonetworks.com/best-practices. Acknowledgments Palo Alto Networks thanks Cristian Mocanu and Dan Marin of Deloitte for discovering and reporting this issue. Timeline 2021-09-12 Added threat prevention workaround for the vulnerability 2021-09-08 Initial publication Terms of usePrivacyProduct Security Assurance and Vulnerability Disclosure Policy Report vulnerabilitiesManage subscriptions (C) 2020 Palo Alto Networks, Inc. All rights reserved. - -------------------------------------------------------------------------------- CVE-2021-3053 PAN-OS: Exceptional Condition Denial-of-Service (DoS) 047910 Severity 7.5 . HIGH Attack Vector NETWORK Attack Complexity LOW Privileges Required NONE User Interaction NONE Scope UNCHANGED Confidentiality Impact NONE Integrity Impact NONE Availability Impact HIGH NVD JSON Published 2021-09-08 Updated 2021-09-13 Reference PAN-158723 Discovered internally Description An improper handling of exceptional conditions vulnerability exists in the Palo Alto Networks PAN-OS dataplane that enables an unauthenticated network-based attacker to send specifically crafted traffic through the firewall that causes the service to crash. Repeated attempts to send this request result in denial of service to all PAN-OS services by restarting the device and putting it into maintenance mode. This issue impacts: PAN-OS 8.1 versions earlier than PAN-OS 8.1.20; PAN-OS 9.0 versions earlier than PAN-OS 9.0.14; PAN-OS 9.1 versions earlier than PAN-OS 9.1.9; PAN-OS 10.0 versions earlier than PAN-OS 10.0.5. This issue does not affect Prisma Access. Product Status Versions Affected Unaffected PAN-OS 10.1 None 10.1.* PAN-OS 10.0 < 10.0.5 >= 10.0.5 PAN-OS 9.1 < 9.1.9 >= 9.1.9 PAN-OS 9.0 < 9.0.14 >= 9.0.14 PAN-OS 8.1 < 8.1.20 >= 8.1.20 Required Configuration for Exposure This issue is applicable only if GTP security is configured on the firewall. Severity: HIGH CVSSv3.1 Base Score: 7.5 (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H) Exploitation Status Palo Alto Networks is not aware of any malicious exploitation of this issue. Weakness Type CWE-755 Improper Handling of Exceptional Conditions Solution This issue is fixed in PAN-OS 8.1.20, PAN-OS 9.0.14, PAN-OS 9.1.9, PAN-OS 10.0.5, and all later PAN-OS versions. Workarounds and Mitigations Enable signatures for Unique Threat ID 91593 on traffic processed by the firewall to block attacks against CVE-2021-3053. Acknowledgments This issue was found by Nicholas Newsom of Palo Alto Networks during internal security review. Timeline 2021-09-13 Added required configuration for exposure and threat prevention workaround for the vulnerability 2021-09-08 Initial publication Terms of usePrivacyProduct Security Assurance and Vulnerability Disclosure Policy Report vulnerabilitiesManage subscriptions (C) 2020 Palo Alto Networks, Inc. All rights reserved. - ------------------------------------------------------------------------------- CVE-2021-3054 PAN-OS: Unsigned Code Execution During Plugin Installation Race Condition Vulnerability 047910 Severity 7.2 . HIGH Attack Vector NETWORK Attack Complexity LOW Privileges Required HIGH User Interaction NONE Scope UNCHANGED Confidentiality Impact HIGH Integrity Impact HIGH Availability Impact HIGH NVD JSON Published 2021-09-08 Updated 2021-09-13 Reference PAN-138727 Discovered externally Description A time-of-check to time-of-use (TOCTOU) race condition vulnerability in the Palo Alto Networks PAN-OS web interface enables an authenticated administrator with permission to upload plugins to execute arbitrary code with root user privileges. This issue impacts: PAN-OS 8.1 versions earlier than PAN-OS 8.1.20; PAN-OS 9.0 versions earlier than PAN-OS 9.0.14; PAN-OS 9.1 versions earlier than PAN-OS 9.1.11; PAN-OS 10.0 versions earlier than PAN-OS 10.0.7; PAN-OS 10.1 versions earlier than PAN-OS 10.1.2. This issue does not affect Prisma Access. Product Status Versions Affected Unaffected PAN-OS 10.1 < 10.1.2 >= 10.1.2 PAN-OS 10.0 < 10.0.7 >= 10.0.7 PAN-OS 9.1 < 9.1.11 >= 9.1.11 PAN-OS 9.0 < 9.0.14 >= 9.0.14 PAN-OS 8.1 < 8.1.20 >= 8.1.20 Severity: HIGH CVSSv3.1 Base Score: 7.2 (CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H) Exploitation Status Palo Alto Networks is not aware of any malicious exploitation of this issue. Weakness Type CWE-367 Time-of-check Time-of-use (TOCTOU) Race Condition Solution This issue is fixed in PAN-OS 8.1.20, PAN-OS 9.0.14, PAN-OS 9.1.11, PAN-OS 10.0.7, PAN-OS 10.1.2, and all later PAN-OS versions. Workarounds and Mitigations Enable signatures for Unique Threat ID 91572 on traffic processed by the firewall to block attacks against CVE-2021-3054. This issue requires the attacker to have authenticated access to the PAN-OS web interface. You can mitigate the impact of this issue by following best practices for securing the PAN-OS web interface. Please review the Best Practices for Securing Administrative Access in the PAN-OS technical documentation at https://docs.paloaltonetworks.com/best-practices. Acknowledgments Palo Alto Networks thanks Praetorian for discovering and reporting this issue. Timeline 2021-09-12 Added threat prevention workaround for the vulnerability 2021-09-08 Initial publication Terms of usePrivacyProduct Security Assurance and Vulnerability Disclosure Policy Report vulnerabilitiesManage subscriptions (C) 2020 Palo Alto Networks, Inc. All rights reserved. - -------------------------------------------------------------------------------- CVE-2021-3055 PAN-OS: XML External Entity (XXE) Reference Vulnerability in the PAN-OS Web Interface 047910 Severity 6.5 . MEDIUM Attack Vector NETWORK Attack Complexity LOW Privileges Required HIGH User Interaction NONE Scope UNCHANGED Confidentiality Impact HIGH Integrity Impact NONE Availability Impact HIGH NVD JSON Published 2021-09-08 Updated 2021-09-13 Reference PAN-166241 Discovered externally Description An improper restriction of XML external entity (XXE) reference vulnerability in the Palo Alto Networks PAN-OS web interface enables an authenticated administrator to read any arbitrary file from the file system and send a specifically crafted request to the firewall that causes the service to crash. Repeated attempts to send this request result in denial of service to all PAN-OS services by restarting the device and putting it into maintenance mode. This issue impacts: PAN-OS 8.1 versions earlier than PAN-OS 8.1.20; PAN-OS 9.0 versions earlier than PAN-OS 9.0.14; PAN-OS 9.1 versions earlier than PAN-OS 9.1.10; PAN-OS 10.0 versions earlier than PAN-OS 10.0.6. This issue does not affect Prisma Access. Product Status Versions Affected Unaffected PAN-OS 10.1 None 10.1.* PAN-OS 10.0 < 10.0.6 >= 10.0.6 PAN-OS 9.1 < 9.1.10 >= 9.1.10 PAN-OS 9.0 < 9.0.14 >= 9.0.14 PAN-OS 8.1 < 8.1.20 >= 8.1.20 Severity: MEDIUM CVSSv3.1 Base Score: 6.5 (CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:N/A:H) Exploitation Status Palo Alto Networks is not aware of any malicious attempts to exploit this vulnerability. Weakness Type CWE-611 Improper Restriction of XML External Entity Reference ('XXE') Solution This issue is fixed in PAN-OS 8.1.20, PAN-OS 9.0.14, PAN-OS 9.1.10, PAN-OS 10.0.6, and all later PAN-OS versions. Workarounds and Mitigations Enable signatures for Unique Threat ID 91588 on traffic destined for the web interface to block attacks against CVE-2021-3055. This issue requires the attacker to have authenticated access to the PAN-OS web interface. You can mitigate the impact of this issue by following best practices for securing the PAN-OS web interface. Please review the Best Practices for Securing Administrative Access in the PAN-OS technical documentation at https://docs.paloaltonetworks.com/best-practices. Acknowledgments This issue was found by a customer of Palo Alto Networks during a security review. Timeline 2021-09-12 Added threat prevention workaround for the vulnerability 2021-09-08 Initial publication Terms of usePrivacyProduct Security Assurance and Vulnerability Disclosure Policy Report vulnerabilitiesManage subscriptions (C) 2020 Palo Alto Networks, Inc. All rights reserved. - --------------------------END INCLUDED TEXT-------------------- You have received this e-mail bulletin as a result of your organisation's registration with AusCERT. The mailing list you are subscribed to is maintained within your organisation, so if you do not wish to continue receiving these bulletins you should contact your local IT manager. 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On call after hours for member emergencies only. =========================================================================== -----BEGIN PGP SIGNATURE----- Comment: http://www.auscert.org.au/render.html?it=1967 iQIVAwUBYUAvEONLKJtyKPYoAQi5Rw//SXW3Tr7tpySRE+qJhNyLsCWOCn8Zd2xi urTbRj5UiwqxMUKdiOExJZw1wJOQW1fYf0lATGxYvMU6aHcXb4vMrNHI9MisYsc8 zpwDdEbx/OryMR9XsnimEHi+rhtXtleb6goGahgBxV1MwXIDn3X12AhCxpwqHerh zlBxQo0gOu3TCWeTyG/c7XYIkC98LHBawFthCBNh+XXYyKuMBriQfxcIPjNAAfGj 5ckdCJxW0qdqRiS8wPRI+QDcRp6yUXwygYGxrizh+1YvxGUEdAqkiC+EpMQ/6WB9 BPenKTjjQpIdZ6Wlp9EtgnumIgjifK9gt28Bk5YmR558VZAa1cEkDuwSrIRPbpIs QxY3zkhFnTGIDW74gE/J4SfPhRneGhU+4/RUbqUG6PTFF6uqXq6w/RgmdNtX/p+K 7v8K7QX5RGIJzjTFnsqQJ2gjJ56Ctdmrh+XEdMGZxn1QHNAGregUgPW4/0eO5r+v Icm9C2RboCgZOL9ntUW+SH+LgOaUF4dAt7v6Yd/oBEo6i/nmBY5QxMljUo02iQeN cnEnoJb9o6ZgYuAbdKmhEaWIaqPRhy0BPCQabHuw4q3m23awgWA8F/r8oog6MuQc pGivS2oQUidBGlb/uMDSiOIePFx5KjNb1k7yEgozg4aIuvBG5TRp4Z6HGz5QqjIS CFcKmiEjNP0= =h/Eg -----END PGP SIGNATURE-----