Multiple Vulnerabilities in Frame Aggregation and Fragmentation Implementations of 802.11 Specification Affecting Cisco Products: May 2021

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Updated:December 15, 2021
Document ID:1620757490828265

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Cisco Security Advisory

Multiple Vulnerabilities in Frame Aggregation and Fragmentation Implementations of 802.11 Specification Affecting Cisco Products: May 2021

Medium
Advisory ID:
cisco-sa-wifi-faf-22epcEWu
First Published:
2021 May 11 18:00 GMT
Last Updated: 
2021 December 15 15:47 GMT
Version 1.9:
Final
Workarounds:
No workarounds available
CVE-2020-24586
CVE-2020-24587
CVE-2020-24588

More...

CWE-345
CWE-772
CWE-99
CVSS Score:
Base 6.5Click Icon to Copy Verbose Score
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N/E:X/RL:X/RC:X
CVE-2020-24586
CVE-2020-24587
CVE-2020-24588

More...

CWE-345
CWE-772
CWE-99

Summary

  • On May 11, 2021, the research paper Fragment and Forge: Breaking Wi-Fi Through Frame Aggregation and Fragmentation was made public. This paper discusses 12 vulnerabilities in the 802.11 standard. One vulnerability is in the frame aggregation functionality, two vulnerabilities are in the frame fragmentation functionality, and the other nine are implementation vulnerabilities. These vulnerabilities could allow an attacker to forge encrypted frames, which could in turn enable the exfiltration of sensitive data from a targeted device.

    This advisory will be updated as additional information becomes available.

    This advisory is available at the following link:
    https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-wifi-faf-22epcEWu

Affected Products

  • Cisco is investigating its product line to determine which products may be affected by these vulnerabilities. As the investigation progresses, Cisco will update this advisory with information about affected products.

    Vulnerable Products

    The following table lists Cisco products that are affected by the vulnerabilities that are described in this advisory. If a future release date is indicated for software, the date provided represents an estimate based on all information known to Cisco as of the Last Updated date at the top of the advisory. Availability dates are subject to change based on a number of factors, including satisfactory testing results and delivery of other priority features and fixes. If no version or date is listed for an affected component (indicated by a blank field and/or an advisory designation of Interim), Cisco is continuing to evaluate the fix and will update the advisory as additional information becomes available. After the advisory is marked Final, customers should refer to the associated Cisco bug(s) for further details.

    CVE ID Cisco Bug ID Fixed Release Availability
    Aironet 1532 APs, AP803 Integrated AP on IR829 Industrial Integrated Services Routers
    CVE-2020-24586 CSCvy32690 8.5MR8
    8.10MR6
    CVE-2020-24587 CSCvy32690 8.5MR8
    8.10MR6
    CVE-2020-24588 CSCvy32690 8.5MR8
    8.10MR6
    CVE-2020-26139 Not affected N/A
    CVE-2020-26140 Not affected N/A
    CVE-2020-26141 Not affected N/A
    CVE-2020-26142 Not affected N/A
    CVE-2020-26143 Not affected N/A
    CVE-2020-26144 Not affected N/A
    CVE-2020-26145 Not affected N/A
    CVE-2020-26146 Not affected N/A
    CVE-2020-26147 Not affected N/A
    Aironet 1542 APs, Aironet 1810 APs, Aironet 1815 APs, Aironet 1832 APs, Aironet 1842 APs, Aironet 1852 APs, Aironet 1800i APs
    CVE-2020-24586 Not affected N/A
    CVE-2020-24587 CSCvx24420 8.5MR8
    8.10MR6
    16.12.6
    17.3.4
    17.6.1
    CVE-2020-24588 CSCvx24420 8.5MR8
    8.10MR6
    16.12.6
    17.3.4
    17.6.1
    CVE-2020-26139 CSCvx24420 8.5MR8
    8.10MR6
    16.12.6
    17.3.4
    17.6.1
    CVE-2020-26140 Not affected N/A
    CVE-2020-26141 Not affected N/A
    CVE-2020-26142 Not affected N/A
    CVE-2020-26143 Not affected N/A
    CVE-2020-26144 Not affected N/A
    CVE-2020-26145 CSCvx24420 8.5MR8
    8.10MR6
    16.12.6
    17.3.4
    17.6.1
    CVE-2020-26146 CSCvx24420 8.5MR8
    8.10MR6
    16.12.6
    17.3.4
    17.6.1
    CVE-2020-26147 Not affected N/A
    Aironet 1552 APs, Aironet 1552H APs, Aironet 1572 APs, Aironet 1702 APs, Aironet 2702 APs, Aironet 3702 APs, IW 3702 APs
    CVE-2020-24586 CSCvy32680 8.5MR8
    8.10MR6
    16.12.6
    17.3.4
    CVE-2020-24587 CSCvy32680 8.5MR8
    8.10MR6
    16.12.6
    17.3.4
    CVE-2020-24588 Not affected N/A
    CVE-2020-26139 Not affected N/A
    CVE-2020-26140 Not affected N/A
    CVE-2020-26141 Not affected N/A
    CVE-2020-26142 Not affected N/A
    CVE-2020-26143 Not affected N/A
    CVE-2020-26144 Not affected N/A
    CVE-2020-26145 Not affected N/A
    CVE-2020-26146 Not affected N/A
    CVE-2020-26147 Not affected N/A
    Aironet 1560 Series APs, Aironet 2800 Series APs, Aironet Series 3800 APs, Aironet Series 4800 APs, Catalyst IW 6300 APs, 6300 Series Embedded Services APs (ESW6300)
    CVE-2020-24586 CSCvx24449 8.5MR8
    8.10MR6
    16.12.6
    17.3.4
    17.6.1
    CVE-2020-24587 CSCvx24449 8.5MR8
    8.10MR6
    16.12.6
    17.3.4
    17.6.1
    CVE-2020-24588 Not affected N/A
    CVE-2020-26139 Not affected N/A
    CVE-2020-26140 CSCvy36698 8.5MR8
    8.10MR6
    16.12.6
    17.3.4
    17.6.1
    CVE-2020-26141 Not affected N/A
    CVE-2020-26142 Not affected N/A
    CVE-2020-26143 CSCvy36698 8.5MR8
    8.10MR6
    16.12.6
    17.3.4
    17.6.1
    CVE-2020-26144 Not affected N/A
    CVE-2020-26145 Not affected N/A
    CVE-2020-26146 CSCvy36698 8.5MR8
    8.10MR6
    16.12.6
    17.3.4
    17.6.1
    CVE-2020-26147 CSCvy36698 8.5MR8
    8.10MR6
    16.12.6
    17.3.4
    17.6.1
    Catalyst 9105 APs, Catalyst 9115 APs, Catalyst 9120 APs, Integrated AP on 1100 Integrated Services Routers
    CVE-2020-24586 CSCvx24425 8.10MR6
    16.12.6
    17.3.4
    17.6.1
    CVE-2020-24587 CSCvx24425 8.10MR6
    16.12.6
    17.3.4
    17.6.1
    CVE-2020-24588 CSCvx24425 8.10MR6
    16.12.6
    17.3.4
    17.6.1
    CVE-2020-26139 Not affected N/A
    CVE-2020-26140 Not affected N/A
    CVE-2020-26141 Not affected N/A
    CVE-2020-26142 Not affected N/A
    CVE-2020-26143 Not affected N/A
    CVE-2020-26144 Not affected N/A
    CVE-2020-26145 Not affected N/A
    CVE-2020-26146 Not affected N/A
    CVE-2020-26147 Not affected N/A
    Catalyst 9117 APs
    CVE-2020-24586 CSCvx24439 8.10MR6
    16.12.6
    17.3.4
    17.6.1
    CVE-2020-24587 CSCvx24439 8.10MR6
    16.12.6
    17.3.4
    17.6.1
    CVE-2020-24588 CSCvx24439 8.10MR6
    16.12.6
    17.3.4
    17.6.1
    CVE-2020-26139 CSCvx24439 8.10MR6
    16.12.6
    17.3.4
    17.6.1
    CVE-2020-26140 Not affected N/A
    CVE-2020-26141 Not affected N/A
    CVE-2020-26142 Not affected N/A
    CVE-2020-26143 Not affected N/A
    CVE-2020-26144 CSCvx24439 8.10MR6
    16.12.6
    17.3.4
    17.6.1
    CVE-2020-26145 CSCvx24439 8.10MR6
    16.12.6
    17.3.4
    17.6.1
    CVE-2020-26146 CSCvx24439 8.10MR6
    16.12.6
    17.3.4
    17.6.1
    CVE-2020-26147 Not affected N/A
    Catalyst 9124 APs1, Catalyst 9130 APs
    CVE-2020-24586 CSCvx24428
    CSCvx24452
    CSCvx24456    		 8.10MR6
    16.12.6
    17.3.4
    17.6.1
    CVE-2020-24587 CSCvx24428
    CSCvx24452
    CSCvx24456    		 8.10MR6
    16.12.6
    17.3.4
    17.6.1
    CVE-2020-24588 CSCvx24428
    CSCvx24452
    CSCvx24456    		 8.10MR6
    16.12.6
    17.3.4
    17.6.1
    CVE-2020-26139 CSCvx24428
    CSCvx24452
    CSCvx24456    		 8.10MR6
    16.12.6
    17.3.4
    17.6.1
    CVE-2020-26140 Not affected N/A
    CVE-2020-26141 Not affected N/A
    CVE-2020-26142 Not affected N/A
    CVE-2020-26143 Not affected N/A
    CVE-2020-26144 CSCvx24428
    CSCvx24452
    CSCvx24456    		 8.10MR6
    16.12.6
    17.3.4
    17.6.1
    CVE-2020-26145 CSCvx24428
    CSCvx24452
    CSCvx24456    		 8.10MR6
    16.12.6
    17.3.4
    17.6.1
    CVE-2020-26146 CSCvx24428
    CSCvx24452
    CSCvx24456    		 8.10MR6
    16.12.6
    17.3.4
    17.6.1
    CVE-2020-26147 Not affected N/A
    1. Catalyst 9124 APs were not supported until Release 17.5, and the fix will be available in Release 17.6.1
    Meraki GR10, GR60, MR20, MR30H, MR33, MR36, MR42, MR42E, MR44, MR45, MR46, MR46E, MR52, MR53, MR53E, MR55, MR56, MR70, MR74, MR76, MR84, MR86
    CVE-2020-24586 No bug ID MR 27.7.1
    CVE-2020-24587 No bug ID MR 27.7.1
    CVE-2020-24588 No bug ID MR 27.7.1
    CVE-2020-26139 No bug ID MR 27.7.1
    CVE-2020-26140 No bug ID MR 27.7.1
    CVE-2020-26141 No bug ID MR 27.7.1
    CVE-2020-26142 No bug ID MR 27.7.1
    CVE-2020-26143 No bug ID MR 27.7.1
    CVE-2020-26144 No bug ID MR 27.7.1
    CVE-2020-26145 No bug ID MR 27.7.1
    CVE-2020-26146 No bug ID MR 27.7.1
    CVE-2020-26147 No bug ID MR 27.7.1
    Meraki MR12, MR18, MR26, MR32, MR34, MR62, MR66, MR72
    CVE-2020-24586 No bug ID MR 26.8.3
    CVE-2020-24587 No bug ID MR 26.8.3
    CVE-2020-24588 No bug ID MR 26.8.3
    CVE-2020-26139 No bug ID MR 26.8.3
    CVE-2020-26140 No bug ID MR 26.8.3
    CVE-2020-26141 No bug ID MR 26.8.3
    CVE-2020-26142 No bug ID MR 26.8.3
    CVE-2020-26143 No bug ID MR 26.8.3
    CVE-2020-26144 No bug ID MR 26.8.3
    CVE-2020-26145 No bug ID MR 26.8.3
    CVE-2020-26146 No bug ID MR 26.8.3
    CVE-2020-26147 No bug ID MR 26.8.3
    Meraki MX64W, MX65W, MX67W, MX67CW, MX68W, MX68CW, Z3, Z3C1
    CVE-2020-24586 No bug ID MX 17.0
    CVE-2020-24587 No bug ID MX 17.0
    CVE-2020-24588 No bug ID MX 17.0
    CVE-2020-26139 No bug ID MX 17.0
    CVE-2020-26140 No bug ID MX 17.0
    CVE-2020-26141 No bug ID MX 17.0
    CVE-2020-26142 No bug ID MX 17.0
    CVE-2020-26143 No bug ID MX 17.0
    CVE-2020-26144 No bug ID MX 17.0
    CVE-2020-26145 No bug ID MX 17.0
    CVE-2020-26146 No bug ID MX 17.0
    CVE-2020-26147 No bug ID MX 17.0
    1. Cisco will not fix these vulnerabilities in the following Cisco Meraki products: MX60W and Z1
    IP Phone 8861, IP Phone 8865, and IP Conference Phone 8832
    CVE-2020-24586 CSCvx60997 14.1(1)
    CVE-2020-24587 CSCvx60997 14.1(1)
    CVE-2020-24588 CSCvx60997 14.1(1)
    CVE-2020-26139 CSCvx60997 14.1(1)
    CVE-2020-26140 CSCvx60997 14.1(1)
    CVE-2020-26141 CSCvx60997 14.1(1)
    CVE-2020-26142 CSCvx60997 14.1(1)
    CVE-2020-26143 CSCvx60997 14.1(1)
    CVE-2020-26144 CSCvx60997 14.1(1)
    CVE-2020-26145 CSCvx60997 14.1(1)
    CVE-2020-26146 CSCvx60997 14.1(1)
    CVE-2020-26147 CSCvx60997 14.1(1)
    IP Phone 6861 and IP Phone 8861 Running Third-Party Call Control (3PCC) Software
    CVE-2020-24586 CSCvx61001 11.3(5)
    CVE-2020-24587 CSCvx61001 11.3(5)
    CVE-2020-24588 CSCvx61001 11.3(5)
    CVE-2020-26139 CSCvx61001 11.3(5)
    CVE-2020-26140 CSCvx61001 11.3(5)
    CVE-2020-26141 CSCvx61001 11.3(5)
    CVE-2020-26142 CSCvx61001 11.3(5)
    CVE-2020-26143 CSCvx61001 11.3(5)
    CVE-2020-26144 CSCvx61001 11.3(5)
    CVE-2020-26145 CSCvx61001 11.3(5)
    CVE-2020-26146 CSCvx61001 11.3(5)
    CVE-2020-26147 CSCvx61001 11.3(5)
    Wireless IP Phone 8821
    CVE-2020-24586 CSCvx61012 11.0(6)SR2
    CVE-2020-24587 CSCvx61012 11.0(6)SR2
    CVE-2020-24588 CSCvx61012 11.0(6)SR2
    CVE-2020-26139 CSCvx61012 11.0(6)SR2
    CVE-2020-26140 CSCvx61012 11.0(6)SR2
    CVE-2020-26141 CSCvx61012 11.0(6)SR2
    CVE-2020-26142 CSCvx61012 11.0(6)SR2
    CVE-2020-26143 CSCvx61012 11.0(6)SR2
    CVE-2020-26144 CSCvx61012 11.0(6)SR2
    CVE-2020-26145 CSCvx61012 11.0(6)SR2
    CVE-2020-26146 CSCvx61012 11.0(6)SR2
    CVE-2020-26147 CSCvx61012 11.0(6)SR2
    Webex Desk Series and Webex Room Series
    CVE-2020-24586 CSCvx89821 1.2(0)SR1
    CVE-2020-24587 CSCvx89821 1.2(0)SR1
    CVE-2020-24588 CSCvx89821 1.2(0)SR1
    CVE-2020-26139 CSCvx89821 1.2(0)SR1
    CVE-2020-26140 CSCvx89821 1.2(0)SR1
    CVE-2020-26141 CSCvx89821 1.2(0)SR1
    CVE-2020-26142 CSCvx89821 1.2(0)SR1
    CVE-2020-26143 CSCvx89821 1.2(0)SR1
    CVE-2020-26144 CSCvx89821 1.2(0)SR1
    CVE-2020-26145 CSCvx89821 1.2(0)SR1
    CVE-2020-26146 CSCvx89821 1.2(0)SR1
    CVE-2020-26147 CSCvx89821 1.2(0)SR1
    Webex Board Series
    CVE-2020-24586 CSCvx61020 10.8.2.5
    CVE-2020-24587 CSCvx61020 10.8.2.5
    CVE-2020-24588 CSCvx61020 10.8.2.5
    CVE-2020-26139 CSCvx61020 10.8.2.5
    CVE-2020-26140 CSCvx61020 10.8.2.5
    CVE-2020-26141 CSCvx61020 10.8.2.5
    CVE-2020-26142 CSCvx61020 10.8.2.5
    CVE-2020-26143 CSCvx61020 10.8.2.5
    CVE-2020-26144 CSCvx61020 10.8.2.5
    CVE-2020-26145 CSCvx61020 10.8.2.5
    CVE-2020-26146 CSCvx61020 10.8.2.5
    CVE-2020-26147 CSCvx61020 10.8.2.5
    Webex Wireless Phone 840 and 860
    CVE-2020-24586 CSCvx62886 1.4(0)
    CVE-2020-24587 CSCvx62886 1.4(0)
    CVE-2020-24588 CSCvx62886 1.4(0)
    CVE-2020-26139 CSCvx62886 1.4(0)
    CVE-2020-26140 CSCvx62886 1.4(0)
    CVE-2020-26141 CSCvx62886 1.4(0)
    CVE-2020-26142 CSCvx62886 1.4(0)
    CVE-2020-26143 CSCvx62886 1.4(0)
    CVE-2020-26144 CSCvx62886 1.4(0)
    CVE-2020-26145 CSCvx62886 1.4(0)
    CVE-2020-26146 CSCvx62886 1.4(0)
    CVE-2020-26147 CSCvx62886 1.4(0)
     

    Products Confirmed Not Vulnerable

    Only products listed in the Vulnerable Products section of this advisory are known to be affected by this vulnerability.

Details

  • The vulnerabilities are not dependent on one another. Exploitation of one of the vulnerabilities is not required to exploit another vulnerability. In addition, a software release that is affected by one of the vulnerabilities may not be affected by the other vulnerabilities.

    For a description of the following vulnerabilities, see Fragment and Forge: Breaking Wi-Fi Through Frame Aggregation and Fragmentation.

    For additional information, see FragAttacks.

    CVE-2020-26140: Accepting plaintext data frames in a protected network

    Security Impact Rating (SIR): Medium
    CVSS Base Score: 6.5
    CVSS Vector: CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

    CVE-2020-26143: Accepting fragmented plaintext data frames in a protected network

    Security Impact Rating (SIR): Medium
    CVSS Base Score: 6.5
    CVSS Vector: CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

    CVE-2020-26144: Accepting plaintext A-MSDU frames that start with an RFC1042 header with EtherType EAPOL (in an encrypted network)

    Security Impact Rating (SIR): Medium
    CVSS Base Score: 6.5
    CVSS Vector: CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

    CVE-2020-26145: Accepting plaintext broadcast fragments as full frames (in an encrypted network)

    Security Impact Rating (SIR): Medium
    CVSS Base Score: 6.5
    CVSS Vector: CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

    CVE-2020-24586: Not clearing fragments from memory when (re)connecting to a network

    Security Impact Rating (SIR): Medium
    CVSS Base Score: 5.7
    CVSS Vector: CVSS:3.1/AV:A/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N

    CVE-2020-24588: Accepting non-SPP A-MSDU frames

    Security Impact Rating (SIR): Medium
    CVSS Base Score: 5.7
    CVSS Vector: CVSS:3.1/AV:A/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N

    CVE-2020-26139: Forwarding EAPOL frames even though the sender is not yet authenticated

    Security Impact Rating (SIR): Medium
    CVSS Base Score: 5.7
    CVSS Vector: CVSS:3.1/AV:A/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L

    CVE-2020-26141: Not verifying the TKIP MIC of fragmented frames

    Security Impact Rating (SIR): Medium
    CVSS Base Score: 5.7
    CVSS Vector: CVSS:3.1/AV:A/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N

    CVE-2020-26142: Processing fragmented frames as full frames

    Security Impact Rating (SIR): Medium
    CVSS Base Score: 5.7
    CVSS Vector: CVSS:3.1/AV:A/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N

    CVE-2020-24587: Reassembling fragments encrypted under different keys

    Security Impact Rating (SIR): Medium
    CVSS Base Score: 4.8
    CVSS Vector: CVSS:3.1/AV:A/AC:H/PR:N/UI:R/S:U/C:N/I:H/A:N

    CVE-2020-26146: Reassembling encrypted fragments with non-consecutive packet numbers

    Security Impact Rating (SIR): Medium
    CVSS Base Score: 4.8
    CVSS Vector: CVSS:3.1/AV:A/AC:H/PR:N/UI:R/S:U/C:N/I:H/A:N

    CVE-2020-26147: Reassembling mixed encrypted/plaintext fragments

    Security Impact Rating (SIR): Medium
    CVSS Base Score: 4.8
    CVSS Vector: CVSS:3.1/AV:A/AC:H/PR:N/UI:R/S:U/C:N/I:H/A:N

Workarounds

  • There are no workarounds that address these vulnerabilities.

Fixed Software

  • For information about fixed software releases, consult the Cisco bugs identified in the Vulnerable Products section of this advisory.

    When considering software upgrades, customers are advised to regularly consult the advisories for Cisco products, which are available from the Cisco Security Advisories page, to determine exposure and a complete upgrade solution.

    In all cases, customers should ensure that the devices to be upgraded contain sufficient memory and confirm that current hardware and software configurations will continue to be supported properly by the new release. If the information is not clear, customers are advised to contact the Cisco Technical Assistance Center (TAC) or their contracted maintenance providers.

Exploitation and Public Announcements

  • The Cisco Product Security Incident Response Team (PSIRT) is aware that proof-of-concept exploit code is available for the vulnerabilities that are described in this advisory.

    The Cisco PSIRT is not aware of any malicious use of the vulnerabilities that are described in this advisory.

Source

  • These vulnerabilities were reported to Cisco by Dr. Mathy Vanhoef of New York University Abu Dhabi. Cisco would like to thank Dr. Vanhoef for his continued help and support during the handling of these vulnerabilities.

Cisco Security Vulnerability Policy

  • To learn about Cisco security vulnerability disclosure policies and publications, see the Security Vulnerability Policy. This document also contains instructions for obtaining fixed software and receiving security vulnerability information from Cisco.

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Revision History

  • Version Description Section Status Date
    1.9 Updated fixed releases. Vulnerable Products Final 2021-DEC-15
    1.8 Updated fixed release details for Aironet 1532/AP803 products. Vulnerable Products Interim 2021-OCT-05
    1.7 Updated fixed release details for multiple products. Vulnerable Products Interim 2021-AUG-30
    1.6 Added additional fixed releases for Meraki products. Vulnerable Products Interim 2021-JUL-13
    1.5 Update affected products. Vulnerable Products Interim 2021-JUN-02
    1.4 Added additional fixed releases. Vulnerable Products Interim 2021-MAY-19
    1.3 Added additional affected products. Vulnerable Products Interim 2021-MAY-17
    1.2 Added additional affected products. Vulnerable Products Interim 2021-MAY-14
    1.1 Updated affected Meraki MR products. Vulnerable Products Interim 2021-MAY-11
    1.0 Initial public release. — Interim 2021-MAY-11
    Show Less

Cisco Security Vulnerability Policy

  • To learn about Cisco security vulnerability disclosure policies and publications, see the Security Vulnerability Policy. This document also contains instructions for obtaining fixed software and receiving security vulnerability information from Cisco.

Subscribe to Cisco Security Notifications

Related to This Advisory