Vulnerability Name:

CVE-2021-27791 (CCN-207386)

Assigned:2021-05-10
Published:2021-05-10
Updated:2022-07-12
Summary:The function that is used to parse the Authentication header in Brocade Fabric OS Web application service before Brocade Fabric OS v9.0.1a and v8.2.3a fails to properly process a malformed authentication header from the client, resulting in reading memory addresses outside the intended range. An unauthenticated attacker could discover a request, which could bypass the authentication process.
CVSS v3 Severity:5.4 Medium (CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N)
4.7 Medium (Temporal CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N/E:U/RL:O/RC:C)
Exploitability Metrics:Attack Vector (AV): Network
Attack Complexity (AC): Low
Privileges Required (PR): Low
User Interaction (UI): None
Scope:Scope (S): Unchanged
Impact Metrics:Confidentiality (C): Low
Integrity (I): Low
Availibility (A): None
4.3 Medium (CCN CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N)
3.8 Low (CCN Temporal CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N/E:U/RL:O/RC:C)
Exploitability Metrics:Attack Vector (AV): Network
Attack Complexity (AC): Low
Privileges Required (PR): Low
User Interaction (UI): None
Scope:Scope (S): Unchanged
Impact Metrics:Confidentiality (C): None
Integrity (I): Low
Availibility (A): None
CVSS v2 Severity:5.5 Medium (CVSS v2 Vector: AV:N/AC:L/Au:S/C:P/I:P/A:N)
Exploitability Metrics:Access Vector (AV): Network
Access Complexity (AC): Low
Authentication (Au): Single_Instance
Impact Metrics:Confidentiality (C): Partial
Integrity (I): Partial
Availibility (A): None
4.0 Medium (CCN CVSS v2 Vector: AV:N/AC:L/Au:S/C:N/I:P/A:N)
Exploitability Metrics:Access Vector (AV): Network
Access Complexity (AC): Low
Athentication (Au): Single_Instance
Impact Metrics:Confidentiality (C): None
Integrity (I): Partial
Availibility (A): None
Vulnerability Type:CWE-125
Vulnerability Consequences:Bypass Security
References:Source: MITRE
Type: CNA
CVE-2021-27791

Source: XF
Type: UNKNOWN
broadcom-cve202127791-sec-bypass(207386)

Source: CONFIRM
Type: Third Party Advisory
https://security.netapp.com/advisory/ntap-20210819-0002/

Source: CCN
Type: Brocade Security Advisory ID BSA-2021-1491
Brocade Fabric OS

Source: MISC
Type: Vendor Advisory
https://www.broadcom.com/support/fibre-channel-networking/security-advisories/brocade-security-advisory-2021-1491

Vulnerable Configuration:Configuration 1:
  • cpe:/o:broadcom:fabric_operating_system:*:*:*:*:*:*:*:* (Version >= 9.0.0 and < 9.0.1a)
  • OR cpe:/o:broadcom:fabric_operating_system:*:*:*:*:*:*:*:* (Version >= 8.2.1 and < 8.2.3a)

    • * Denotes that component is vulnerable
    BACK
    broadcom fabric operating system *
    broadcom fabric operating system *