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Cisco IOS and IOS XE Software SNMP Extended Named Access Control List Bypass Vulnerability

cisco-sa-snmp-uwBXfqww · Medium · Published · Updated

A vulnerability in the implementation of the Simple Network Management Protocol (SNMP) IPv4 access control list (ACL) feature of Cisco IOS Software and Cisco IOS XE Software could allow an unauthenticated, remote attacker to perform SNMP polling of an affected device, even if it is configured to deny SNMP traffic.  This vulnerability exists because Cisco IOS Software and Cisco IOS XE Software do not support extended IPv4 ACLs for SNMP, but they do allow administrators to configure extended named IPv4 ACLs that are attached to the SNMP server configuration without a warning message. This can result in no ACL being applied to the SNMP listening process. An attacker could exploit this vulnerability by performing SNMP polling of an affected device. A successful exploit could allow the attacker to perform SNMP operations that should be denied. The attacker has no control of the SNMP ACL configuration and would still need a valid SNMP version 2c (SNMPv2c) community string or SNMP version 3 (SNMPv3) user credentials. SNMP with IPv6 ACL configurations is not affected. For more information, see the Details section of this advisory. Cisco has released software updates that address this vulnerability. There are workarounds that address this vulnerability. This advisory is available at the following link:https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-snmp-uwBXfqww

Cisco advisory · CSAF JSON

Workarounds

There is a workaround that addresses this vulnerability.

There is no support for extended IPv4 ACLs against SNMP. Only standard numbered and named IPv4 ACLs are supported.

The workaround is to change all extended named ACLs that are applied to SNMP configurations to standard named ACLs.

Note: Releases of Cisco IOS and IOS XE Software that include the fix for this vulnerability prevent the application of extended named ACLs. This workaround should be applied before upgrading.

While this workaround has been deployed and was proven successful in a test environment, customers should determine the applicability and effectiveness in their own environment and under their own use conditions. Customers should be aware that any workaround or mitigation that is implemented may negatively impact the functionality or performance of their network based on intrinsic customer deployment scenarios and limitations. Customers should not deploy any workarounds or mitigations before first evaluating the applicability to their own environment and any impact to such environment.

CVEsCVE-2024-20373
Cisco Bug IDsCSCwe24431
CVSS ScoreBase 5.3
Base 5.3 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N/E:X/RL:X/RC:X
Product Names From Source
Cisco IOS 15.2(4)E2, Cisco IOS 15.2(5)E, Cisco IOS 15.2(4)E3, Cisco IOS 15.2(5a)E, Cisco IOS 15.2(5)E1, Cisco IOS 15.2(5b)E, Cisco IOS 15.2(4m)E3, Cisco IOS 15.2(5c)E, Cisco IOS 15.2(4n)E2, Cisco IOS 15.2(4o)E2, Cisco IOS 15.2(5a)E1, Cisco IOS 15.2(4)E4, Cisco IOS 15.2(5)E2, Cisco IOS 15.2(4p)E1, Cisco IOS 15.2(6)E, Cisco IOS 15.2(4)E5, Cisco IOS 15.2(5)E2c, Cisco IOS 15.2(4m)E2, Cisco IOS 15.2(4o)E3, Cisco IOS 15.2(4q)E1, Cisco IOS 15.2(6)E0a, Cisco IOS 15.2(6)E1, Cisco IOS 15.2(6)E0c, Cisco IOS 15.2(4)E6, Cisco IOS 15.2(6)E2, Cisco IOS 15.2(6)E1a, Cisco IOS 15.2(4)E7, Cisco IOS 15.2(6)E1s, Cisco IOS 15.2(4s)E1, Cisco IOS 15.2(7)E, Cisco IOS 15.2(4)E8, Cisco IOS 15.2(6)E2a, Cisco IOS 15.2(6)E2b, Cisco IOS 15.2(7)E1, Cisco IOS 15.2(7)E0a, Cisco IOS 15.2(7)E0b, Cisco IOS 15.2(7)E0s, Cisco IOS 15.2(6)E3, Cisco IOS 15.2(4)E9, Cisco IOS 15.2(7)E2, Cisco IOS 15.2(7a)E0b, Cisco IOS 15.2(4)E10, Cisco IOS 15.2(7)E3, Cisco IOS 15.2(7)E1a, Cisco IOS 15.2(7b)E0b, Cisco IOS 15.2(7)E2a, Cisco IOS 15.2(4)E10a, Cisco IOS 15.2(7)E4, Cisco IOS 15.2(7)E2b, Cisco IOS 15.2(7)E3k, Cisco IOS 15.2(4)E10b, Cisco IOS 15.2(8)E, Cisco IOS 15.2(8)E1, Cisco IOS 15.2(7)E5, Cisco IOS 15.2(7)E6, Cisco IOS 15.2(8)E2, Cisco IOS 15.2(4)E10c, Cisco IOS 15.2(4)E10d, Cisco IOS 15.2(7)E7, Cisco IOS 15.2(8)E3, Cisco IOS 15.2(7)E8, Cisco IOS 15.2(8)E4, Cisco IOS 15.2(7)E9, Cisco IOS 15.2(8)E5, Cisco IOS 15.2(7)E10, Cisco IOS 15.2(2)SY1, Cisco IOS 15.2(2)SY2, Cisco IOS 15.2(1)SY3, Cisco IOS 15.2(1)SY4, Cisco IOS 15.2(2)SY3, Cisco IOS 15.2(1)SY5, Cisco IOS 15.2(1)SY6, Cisco IOS 15.2(1)SY7, Cisco IOS 15.2(1)SY8, Cisco IOS 15.2(5)EX, Cisco IOS 15.4(3)M6, Cisco IOS 15.4(3)M7, Cisco IOS 15.4(3)M6a, Cisco IOS 15.4(3)M7a, Cisco IOS 15.4(3)M8, Cisco IOS 15.4(3)M9, Cisco IOS 15.4(3)M10, Cisco IOS 15.2(6)EB, Cisco IOS 15.2(5)EA, Cisco IOS 15.5(3)M4, Cisco IOS 15.5(3)M4a, Cisco IOS 15.5(3)M5, Cisco IOS 15.5(3)M4b, Cisco IOS 15.5(3)M4c, Cisco IOS 15.5(3)M6, Cisco IOS 15.5(3)M7, Cisco IOS 15.5(3)M6a, Cisco IOS 15.5(3)M8, Cisco IOS 15.5(3)M9, Cisco IOS 15.5(3)M10, Cisco IOS 15.5(3)M11, Cisco IOS 15.5(3)M11a, Cisco IOS 15.5(3)M11b, Cisco IOS 15.6(2)T, Cisco IOS 15.6(2)T1, Cisco IOS 15.6(2)T0a, Cisco IOS 15.6(2)T2, Cisco IOS 15.6(2)T3, Cisco IOS 15.3(1)SY, Cisco IOS 15.3(0)SY, Cisco IOS 15.3(1)SY1, Cisco IOS 15.3(1)SY2, Cisco IOS 15.6(3)M, Cisco IOS 15.6(3)M1, Cisco IOS 15.6(3)M0a, Cisco IOS 15.6(3)M1a, Cisco IOS 15.6(3)M1b, Cisco IOS 15.6(3)M2, Cisco IOS 15.6(3)M2a, Cisco IOS 15.6(3)M3, Cisco IOS 15.6(3)M3a, Cisco IOS 15.6(3)M4, Cisco IOS 15.6(3)M5, Cisco IOS 15.6(3)M6, Cisco IOS 15.6(3)M7, Cisco IOS 15.6(3)M6a, Cisco IOS 15.6(3)M6b, Cisco IOS 15.6(3)M8, Cisco IOS 15.6(3)M9, Cisco IOS 15.4(1)SY, Cisco IOS 15.4(1)SY1, Cisco IOS 15.4(1)SY2, Cisco IOS 15.4(1)SY3, Cisco IOS 15.4(1)SY4, Cisco IOS 15.5(1)SY, Cisco IOS 15.5(1)SY1, Cisco IOS 15.5(1)SY2, Cisco IOS 15.5(1)SY3, Cisco IOS 15.5(1)SY4, Cisco IOS 15.5(1)SY5, Cisco IOS 15.5(1)SY6, Cisco IOS 15.5(1)SY7, Cisco IOS 15.5(1)SY8, Cisco IOS 15.5(1)SY9, Cisco IOS 15.5(1)SY10, Cisco IOS 15.5(1)SY11, Cisco IOS 15.5(1)SY12, Cisco IOS 15.5(1)SY13, Cisco IOS 15.7(3)M, Cisco IOS 15.7(3)M1, Cisco IOS 15.7(3)M0a, Cisco IOS 15.7(3)M3, Cisco IOS 15.7(3)M2, Cisco IOS 15.7(3)M4, Cisco IOS 15.7(3)M5, Cisco IOS 15.7(3)M4a, Cisco IOS 15.7(3)M4b, Cisco IOS 15.7(3)M6, Cisco IOS 15.7(3)M7, Cisco IOS 15.7(3)M8, Cisco IOS 15.7(3)M9, Cisco IOS 15.7(3)M10, Cisco IOS 15.7(3)M10a, Cisco IOS 15.7(3)M10b, Cisco IOS 15.8(3)M, Cisco IOS 15.8(3)M1, Cisco IOS 15.8(3)M0a, Cisco IOS 15.8(3)M0b, Cisco IOS 15.8(3)M2, Cisco IOS 15.8(3)M1a, Cisco IOS 15.8(3)M3, Cisco IOS 15.8(3)M2a, Cisco IOS 15.8(3)M4, Cisco IOS 15.8(3)M3a, Cisco IOS 15.8(3)M3b, Cisco IOS 15.8(3)M5, Cisco IOS 15.8(3)M6, Cisco IOS 15.8(3)M7, Cisco IOS 15.8(3)M8, Cisco IOS 15.8(3)M9, Cisco IOS 12.2(6)I1, Cisco IOS 15.9(3)M, Cisco IOS 15.9(3)M1, Cisco IOS 15.9(3)M0a, Cisco IOS 15.9(3)M2, Cisco IOS 15.9(3)M3, Cisco IOS 15.9(3)M2a, Cisco IOS 15.9(3)M3a, Cisco IOS 15.9(3)M4, Cisco IOS 15.9(3)M3b, Cisco IOS 15.9(3)M5, Cisco IOS 15.9(3)M4a, Cisco IOS 15.9(3)M6, Cisco IOS 15.9(3)M7, Cisco IOS 15.9(3)M6a, Cisco IOS 15.9(3)M6b, Cisco IOS 15.9(3)M8, Cisco IOS 15.9(3)M7a, Cisco IOS 15.9(3)M8a, Cisco IOS 15.9(3)M9, Cisco IOS 15.9(3)M8b, Cisco IOS 15.9(3)M9a, Cisco IOS 15.1(3)SVR1, Cisco IOS 15.1(3)SVR2, Cisco IOS 15.1(3)SVR3, Cisco IOS 15.1(3)SVR10, Cisco IOS 15.1(3)SVS, Cisco IOS 15.1(3)SVS1, Cisco IOS 15.1(3)SVT1, Cisco IOS 15.1(3)SVT2, Cisco IOS 15.1(3)SVT3, Cisco IOS 15.1(3)SVT4, Cisco IOS 15.1(3)SVU1, Cisco IOS 15.1(3)SVU10, Cisco IOS 15.1(3)SVU2, Cisco IOS 15.1(3)SVU11, Cisco IOS 15.1(3)SVU20, Cisco IOS 15.1(3)SVU21, Cisco IOS 15.1(3)SVV1, Cisco IOS 15.1(3)SVV2, Cisco IOS 15.1(3)SVV3, Cisco IOS 15.1(3)SVV4, Cisco IOS 15.1(3)SVW, Cisco IOS 15.1(3)SVW1, Cisco IOS 15.1(3)SVX, Cisco IOS 15.1(3)SVX1, Cisco IOS XE Software 3.8.2E, Cisco IOS XE Software 3.8.3E, Cisco IOS XE Software 3.8.4E, Cisco IOS XE Software 3.8.5E, Cisco IOS XE Software 3.8.5aE, Cisco IOS XE Software 3.8.6E, Cisco IOS XE Software 3.8.7E, Cisco IOS XE Software 3.8.8E, Cisco IOS XE Software 3.8.9E, Cisco IOS XE Software 3.8.10E, Cisco IOS XE Software 3.8.10cE, Cisco IOS XE Software 3.8.10dE, Cisco IOS XE Software 3.9.0E, Cisco IOS XE Software 3.9.1E, Cisco IOS XE Software 3.9.2E, Cisco IOS XE Software 3.9.2bE, Cisco IOS XE Software 16.6.6, Cisco IOS XE Software 16.6.7, Cisco IOS XE Software 16.6.7a, Cisco IOS XE Software 16.6.8, Cisco IOS XE Software 16.6.9, Cisco IOS XE Software 16.6.10, Cisco IOS XE Software 16.9.3, Cisco IOS XE Software 16.9.3h, Cisco IOS XE Software 16.9.4, Cisco IOS XE Software 16.9.3s, Cisco IOS XE Software 16.9.3a, Cisco IOS XE Software 16.9.4c, Cisco IOS XE Software 16.9.5, Cisco IOS XE Software 16.9.5f, Cisco IOS XE Software 16.9.6, Cisco IOS XE Software 16.9.7, Cisco IOS XE Software 16.9.8, Cisco IOS XE Software 16.9.8a, Cisco IOS XE Software 16.9.8b, Cisco IOS XE Software 3.10.0E, Cisco IOS XE Software 3.10.1E, Cisco IOS XE Software 3.10.0cE, Cisco IOS XE Software 3.10.2E, Cisco IOS XE Software 3.10.1aE, Cisco IOS XE Software 3.10.1sE, Cisco IOS XE Software 3.10.3E, Cisco IOS XE Software 16.11.1, Cisco IOS XE Software 16.11.1a, Cisco IOS XE Software 16.11.1b, Cisco IOS XE Software 16.11.2, Cisco IOS XE Software 16.11.1s, Cisco IOS XE Software 16.11.1c, Cisco IOS XE Software 16.12.1, Cisco IOS XE Software 16.12.1s, Cisco IOS XE Software 16.12.1a, Cisco IOS XE Software 16.12.1c, Cisco IOS XE Software 16.12.1w, Cisco IOS XE Software 16.12.2, Cisco IOS XE Software 16.12.1y, Cisco IOS XE Software 16.12.2a, Cisco IOS XE Software 16.12.3, Cisco IOS XE Software 16.12.8, Cisco IOS XE Software 16.12.2s, Cisco IOS XE Software 16.12.1x, Cisco IOS XE Software 16.12.1t, Cisco IOS XE Software 16.12.2t, Cisco IOS XE Software 16.12.4, Cisco IOS XE Software 16.12.3s, Cisco IOS XE Software 16.12.1z, Cisco IOS XE Software 16.12.3a, Cisco IOS XE Software 16.12.4a, Cisco IOS XE Software 16.12.5, Cisco IOS XE Software 16.12.6, Cisco IOS XE Software 16.12.1z1, Cisco IOS XE Software 16.12.5a, Cisco IOS XE Software 16.12.5b, Cisco IOS XE Software 16.12.1z2, Cisco IOS XE Software 16.12.6a, Cisco IOS XE Software 16.12.7, Cisco IOS XE Software 16.12.9, Cisco IOS XE Software 16.12.10, Cisco IOS XE Software 16.12.10a, Cisco IOS XE Software 16.12.11, Cisco IOS XE Software 3.11.0E, Cisco IOS XE Software 3.11.1E, Cisco IOS XE Software 3.11.2E, Cisco IOS XE Software 3.11.3E, Cisco IOS XE Software 3.11.1aE, Cisco IOS XE Software 3.11.2aE, Cisco IOS XE Software 3.11.4E, Cisco IOS XE Software 3.11.3aE, Cisco IOS XE Software 3.11.5E, Cisco IOS XE Software 3.11.6E, Cisco IOS XE Software 3.11.7E, Cisco IOS XE Software 3.11.8E, Cisco IOS XE Software 3.11.9E, Cisco IOS XE Software 3.11.10E, Cisco IOS XE Software 17.1.1, Cisco IOS XE Software 17.1.1a, Cisco IOS XE Software 17.1.1s, Cisco IOS XE Software 17.1.2, Cisco IOS XE Software 17.1.1t, Cisco IOS XE Software 17.1.3, Cisco IOS XE Software 17.2.1, Cisco IOS XE Software 17.2.1r, Cisco IOS XE Software 17.2.1a, Cisco IOS XE Software 17.2.1v, Cisco IOS XE Software 17.2.2, Cisco IOS XE Software 17.2.3, Cisco IOS XE Software 17.3.1, Cisco IOS XE Software 17.3.2, Cisco IOS XE Software 17.3.3, Cisco IOS XE Software 17.3.1a, Cisco IOS XE Software 17.3.1w, Cisco IOS XE Software 17.3.2a, Cisco IOS XE Software 17.3.1x, Cisco IOS XE Software 17.3.1z, Cisco IOS XE Software 17.3.3a, Cisco IOS XE Software 17.3.4, Cisco IOS XE Software 17.3.5, Cisco IOS XE Software 17.3.4a, Cisco IOS XE Software 17.3.6, Cisco IOS XE Software 17.3.4b, Cisco IOS XE Software 17.3.4c, Cisco IOS XE Software 17.3.5a, Cisco IOS XE Software 17.3.5b, Cisco IOS XE Software 17.3.7, Cisco IOS XE Software 17.3.8, Cisco IOS XE Software 17.3.8a, Cisco IOS XE Software 17.4.1, Cisco IOS XE Software 17.4.2, Cisco IOS XE Software 17.4.1a, Cisco IOS XE Software 17.4.1b, Cisco IOS XE Software 17.4.1c, Cisco IOS XE Software 17.4.2a, Cisco IOS XE Software 17.5.1, Cisco IOS XE Software 17.5.1a, Cisco IOS XE Software 17.5.1b, Cisco IOS XE Software 17.5.1c, Cisco IOS XE Software 17.6.1, Cisco IOS XE Software 17.6.2, Cisco IOS XE Software 17.6.1w, Cisco IOS XE Software 17.6.1a, Cisco IOS XE Software 17.6.1x, Cisco IOS XE Software 17.6.3, Cisco IOS XE Software 17.6.1y, Cisco IOS XE Software 17.6.1z, Cisco IOS XE Software 17.6.3a, Cisco IOS XE Software 17.6.4, Cisco IOS XE Software 17.6.1z1, Cisco IOS XE Software 17.6.5, Cisco IOS XE Software 17.6.5a, Cisco IOS XE Software 17.7.1, Cisco IOS XE Software 17.7.1a, Cisco IOS XE Software 17.7.1b, Cisco IOS XE Software 17.7.2, Cisco IOS XE Software 17.10.1, Cisco IOS XE Software 17.10.1a, Cisco IOS XE Software 17.10.1b, Cisco IOS XE Software 17.8.1, Cisco IOS XE Software 17.8.1a, Cisco IOS XE Software 17.9.1, Cisco IOS XE Software 17.9.1w, Cisco IOS XE Software 17.9.2, Cisco IOS XE Software 17.9.1a, Cisco IOS XE Software 17.9.1x, Cisco IOS XE Software 17.9.1y, Cisco IOS XE Software 17.9.3, Cisco IOS XE Software 17.9.2a, Cisco IOS XE Software 17.9.1x1, Cisco IOS XE Software 17.9.3a, Cisco IOS XE Software 17.9.1y1, Cisco IOS XE Software 17.11.99SW, Cisco IOS XE Catalyst SD-WAN 16.10.2, Cisco IOS XE Catalyst SD-WAN 16.10.4, Cisco IOS, Cisco IOS XE Catalyst SD-WAN, Cisco IOS XE Software

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