Synology-SA-21:20 FragAttacks

Publish Time: 2021-05-12 18:26:08 UTC+8

Last Updated: 2021-05-12 18:26:08 UTC+8

Severity
Moderate
Status
Accepted

Abstract

Multiple vulnerabilities allow remote attackers to forge encrypted frames or conduct denial-of-service attacks or man-in-the-middle attackers to forge encrypted frames via a susceptible version of Synology Router Manager (SRM).

Affected Products

Product Severity Fixed Release Availability
RT2600ac Moderate Upgrade SRM to 1.2.5-8225 or above.
MR2200ac Moderate Upgrade SRM to 1.2.5-8225 or above.
RT1900ac Moderate Ongoing

Mitigation

None

Detail

  • CVE-2020-24586

    • Severity: Moderate
    • CVSS3 Base Score: 5.7
    • CVSS3 Vector: CVSS:3.1/AV:A/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N
    • The 802.11 standard that underpins Wi-Fi Protected Access (WPA, WPA2, and WPA3) and Wired Equivalent Privacy (WEP) doesn't require that received fragments be cleared from memory after (re)connecting to a network. Under the right circumstances, when another device sends fragmented frames encrypted using WEP, CCMP, or GCMP, this can be abused to inject arbitrary network packets and/or exfiltrate user data.

  • CVE-2020-24587

    • Severity: Moderate
    • CVSS3 Base Score: 4.8
    • CVSS3 Vector: CVSS:3.1/AV:A/AC:H/PR:N/UI:R/S:U/C:N/I:H/A:N
    • The 802.11 standard that underpins Wi-Fi Protected Access (WPA, WPA2, and WPA3) and Wired Equivalent Privacy (WEP) doesn't require that all fragments of a frame are encrypted under the same key. An adversary can abuse this to decrypt selected fragments when another device sends fragmented frames and the WEP, CCMP, or GCMP encryption key is periodically renewed.

  • CVE-2020-24588

    • Severity: Moderate
    • CVSS3 Base Score: 5.7
    • CVSS3 Vector: CVSS:3.1/AV:A/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N
    • The 802.11 standard that underpins Wi-Fi Protected Access (WPA, WPA2, and WPA3) and Wired Equivalent Privacy (WEP) doesn't require that the A-MSDU flag in the plaintext QoS header field is authenticated. Against devices that support receiving non-SSP A-MSDU frames (which is mandatory as part of 802.11n), an adversary can abuse this to inject arbitrary network packets.

  • CVE-2020-26140

    • Severity: Moderate
    • CVSS3 Base Score: 6.5
    • CVSS3 Vector: CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
    • An issue was discovered in the ALFA Windows 10 driver 6.1316.1209 for AWUS036H. The WEP, WPA, WPA2, and WPA3 implementations accept plaintext frames in a protected Wi-Fi network. An adversary can abuse this to inject arbitrary data frames independent of the network configuration.

  • CVE-2020-26141

    • Severity: Moderate
    • CVSS3 Base Score: 5.7
    • CVSS3 Vector: CVSS:3.1/AV:A/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N
    • An issue was discovered in the ALFA Windows 10 driver 6.1316.1209 for AWUS036H. The Wi-Fi implementation does not verify the Message Integrity Check (authenticity) of fragmented TKIP frames. An adversary can abuse this to inject and possibly decrypt packets in WPA or WPA2 networks that support the TKIP data-confidentiality protocol.

  • CVE-2020-26142 (RT1900ac)

    • Severity: Moderate
    • CVSS3 Base Score: 5.7
    • CVSS3 Vector: CVSS:3.1/AV:A/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N
    • An issue was discovered in the kernel in OpenBSD 6.6. The WEP, WPA, WPA2, and WPA3 implementations treat fragmented frames as full frames. An adversary can abuse this to inject arbitrary network packets, independent of the network configuration.

  • CVE-2020-26142 (RT2600ac, MR2200ac)

    • Severity: Not affected
    • CVSS3 Base Score: 0.0
    • CVSS3 Vector: CVSS:3.1/AV:A/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:N
    • An issue was discovered in the kernel in OpenBSD 6.6. The WEP, WPA, WPA2, and WPA3 implementations treat fragmented frames as full frames. An adversary can abuse this to inject arbitrary network packets, independent of the network configuration.

  • CVE-2020-26143

    • Severity: Moderate
    • CVSS3 Base Score: 6.5
    • CVSS3 Vector: CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
    • An issue was discovered in the ALFA Windows 10 driver 1030.36.604 for AWUS036ACH. The WEP, WPA, WPA2, and WPA3 implementations accept fragmented plaintext frames in a protected Wi-Fi network. An adversary can abuse this to inject arbitrary data frames independent of the network configuration.

  • CVE-2020-26144

    • Severity: Moderate
    • CVSS3 Base Score: 6.5
    • CVSS3 Vector: CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
    • An issue was discovered on Samsung Galaxy S3 i9305 4.4.4 devices. The WEP, WPA, WPA2, and WPA3 implementations accept plaintext A-MSDU frames as long as the first 8 bytes correspond to a valid RFC1042 (i.e., LLC/SNAP) header for EAPOL. An adversary can abuse this to inject arbitrary network packets independent of the network configuration.

  • CVE-2020-26145

    • Severity: Moderate
    • CVSS3 Base Score: 6.5
    • CVSS3 Vector: CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
    • An issue was discovered on Samsung Galaxy S3 i9305 4.4.4 devices. The WEP, WPA, WPA2, and WPA3 implementations accept second (or subsequent) broadcast fragments even when sent in plaintext and process them as full unfragmented frames. An adversary can abuse this to inject arbitrary network packets independent of the network configuration.

  • CVE-2020-26146

    • Severity: Moderate
    • CVSS3 Base Score: 4.8
    • CVSS3 Vector: CVSS:3.1/AV:A/AC:H/PR:N/UI:R/S:U/C:N/I:H/A:N
    • An issue was discovered on Samsung Galaxy S3 i9305 4.4.4 devices. The WPA, WPA2, and WPA3 implementations reassemble fragments with non-consecutive packet numbers. An adversary can abuse this to exfiltrate selected fragments. This vulnerability is exploitable when another device sends fragmented frames and the WEP, CCMP, or GCMP data-confidentiality protocol is used. Note that WEP is vulnerable to this attack by design.

  • CVE-2020-26147

    • Severity: Moderate
    • CVSS3 Base Score: 4.8
    • CVSS3 Vector: CVSS:3.1/AV:A/AC:H/PR:N/UI:R/S:U/C:N/I:H/A:N
    • An issue was discovered in the Linux kernel 5.8.9. The WEP, WPA, WPA2, and WPA3 implementations reassemble fragments even though some of them were sent in plaintext. This vulnerability can be abused to inject packets and/or exfiltrate selected fragments when another device sends fragmented frames and the WEP, CCMP, or GCMP data-confidentiality protocol is used.

  • CVE-2020-26139

    • Severity: Low
    • CVSS3 Base Score: 3.8
    • CVSS3 Vector: CVSS:3.1/AV:A/AC:L/PR:N/UI:R/S:C/C:N/I:N/A:L
    • An issue was discovered in the kernel in NetBSD 7.1. An Access Point (AP) forwards EAPOL frames to other clients even though the sender has not yet successfully authenticated to the AP. This might be abused in projected Wi-Fi networks to launch denial-of-service attacks against connected clients and makes it easier to exploit other vulnerabilities in connected clients.

Reference

Revision

Revision Date Description
1 2021-05-12 Initial public release.