CVE-2017-6738

Description

The Simple Network Management Protocol (SNMP) subsystem of Cisco IOS and IOS XE Software contains multiple vulnerabilities that could allow an authenticated, remote attacker to remotely execute code on an affected system or cause an affected system to reload. An attacker could exploit these vulnerabilities by sending a crafted SNMP packet to an affected system via IPv4 or IPv6. Only traffic directed to an affected system can be used to exploit these vulnerabilities. The vulnerabilities are due to a buffer overflow condition in the SNMP subsystem of the affected software. The vulnerabilities affect all versions of SNMP - Versions 1, 2c, and 3. To exploit these vulnerabilities via SNMP Version 2c or earlier, the attacker must know the SNMP read-only community string for the affected system. To exploit these vulnerabilities via SNMP Version 3, the attacker must have user credentials for the affected system. A successful exploit could allow the attacker to execute arbitrary code and obtain full control of the affected system or cause the affected system to reload. Customers are advised to apply the workaround as contained in the Workarounds section below. Fixed software information is available via the Cisco IOS Software Checker. All devices that have enabled SNMP and have not explicitly excluded the affected MIBs or OIDs should be considered vulnerable. There are workarounds that address these vulnerabilities.

Gravité et risque d'exploitation

CVE-2017-6738 obtient un score CVSS de 0.0/10, soit une gravité non évaluée. Selon le modèle EPSS, la probabilité qu'elle soit exploitée dans les 30 prochains jours est de 10.85 %, ce qui la place devant 95.8 % des CVE référencées.

Que faire ?

• Vérifiez si IOS (versions 15.0(1)EY1, 3.5.4SQ, 15.0(2)EX11, 15.4(1)T1, 12.2(55)EY, 15.4(1)T, 15.5(3)M4, 12.2(50)SG1, 12.2(60)EZ1, 3.3.5SE, 16.2.2, 15.3(2)T4, 15.2(4)M8, 12.2(52)EX1, 12.2(50)SG3, 3.9.0E, 3.6.6E, 15.2(5a)E, 3.7.4E, 15.6(3)M2a, 15.2(1)E2, 15.1(2)SG1, 15.4(2)T, 15.5(1)T, 3.6.3E, 15.2(1)SY2, 15.2(4)E3, 12.2(53)SG7, 15.2(2)E5, 15.5(2)T3, 15.0(2)EX13, 15.1(2)SG4, 15.3(1)T3, 15.0(2)EA1, 15.2(4)M6, 12.2(53)SE, 3.2.0SE, 15.0(2)SQD3, 12.2(50)SQ2, 3.8.0E, 15.2(3)E, 15.4(2)T4, 15.6(3)M1, 12.2(54)SG, 15.0(2)SG3, 15.0(2)SE8, 3.9.1E, 16.1.3, 15.0(2)EX1, 3.18.2aSP, 3.2.5SG, 15.2(4)EA4, 12.2(53)SG3, 15.0(2)EY3, 12.2(54)XO, 15.0(2)SE2, 15.0(2)EY2, 16.2.1, 3.2.10SG, 15.2(2)EA1, 3.2.11SG, 15.0(2)SG11, 12.2(60)EZ5, 15.3(1)SY2, 15.0(2)SG6, 3.2.9SG, 3.6.2E, 16.4.2, 15.0(2)SE6, 12.2(58)SE, 12.2(50)SG8, 15.3(3)M3, 12.2(50)SG, 15.0(1)EX, 15.5(3)M1, 15.2(4)JN, 15.0(2)SE10, 15.3(3)JPC5, 15.2(5)E1, 12.2(58)EX, 15.2(4)EA1, 12.2(52)EY3, 16.5.1b, 15.6(1)T1, 15.0(2)EK1, 15.3(3)M5, 12.2(58)EY2, 15.2(2)EB1, 12.2(50)SG6, 15.2(5)EX, 3.4.0SQ, 12.2(60)EZ4, 15.0(2)SE1, 15.2(3)E3, 15.1(2)SG7, 12.2(55)EX, 15.4(1)T2, 15.2(2a)E1, 12.2(53)EZ, 12.2(53)SG5, 12.2(52)EY1, 3.2.6SG, 3.3.1SG, 3.8.1E, 15.6(1)T2, 15.3(3)M6, 12.2(53)SG11, 3.8.4E, 3.5.1E, 15.0(2)SG10, 15.2(3)E1, 15.4(1)CG1, 15.0(1)EY2, 15.0(2)SG11a, 15.0(2)SG5, 15.1(1)SG1, 12.2(50)SE2, 15.6(2)T, 12.2(53)SG8, 3.7.2E, 3.4.1SQ, 15.0(2)SQD5, 3.5.3SQ, 3.2.1SE, 12.2(55)SE3, 12.2(50)SE5, 3.8.3E, 15.2(2)E4, 15.5(1)SY, 12.2(55)SE11, 3.5.2E, 15.2(1)E, 15.3(3)JPR1, 15.3(1)SY, 15.2(2)E3, 3.4.2SG, 15.3(2)T2, 3.6.0E, 15.2(2)E1, 15.0(1)SE2, 15.3(3)M2, 15.2(4)M10, 3.3.1SE, 15.1(1)SG, 15.2(2)SY1, 15.0(2)EJ, 15.2(4)E4, 15.2(2)SY2, 3.4.3SG, 15.0(2)EX12, 15.2(3)GC, 15.6(1)T, 12.2(52)SE, 15.2(4)E1, 16.1.2, 15.4(1)T3, 3.2.8SG, 15.5(3)M, 3.8.2E, 12.2(55)EX2, 15.0(1)XO, 15.0(2)EY1, 12.2(55)EX3, 15.0(2)EX8, 15.2(5a)E1, 16.3.4, 12.2(52)SG, 15.0(1)XO1, 15.0(2)SG4, 15.4(1)SY, 12.2(54)SG1, 15.2(4)GC, 15.2(5b)E, 12.2(58)EZ, 15.3(1)T4, 15.5(2)T2, 15.2(1)SY1, 12.2(55)SE10, 12.2(53)EX, 15.5(2)T1, 15.3(3)M4, 12.2(55)SE9, 12.2(50)SQ6, 15.0(2)SQD, 15.0(2)SQD6, 12.2(53)SG2, 15.2(4)M11, 15.3(3)JAA1, 12.2(55)SE1, 12.2(53)SE2, 3.7.0E, 12.2(53)SG1, 12.2(60)EZ6, 12.2(60)EZ2, 15.0(2)SG, 12.2(50)SQ5, 15.5(1)T4, 15.6(1)T3, 15.6(3)M2, 15.3(3)M8, 15.2(2)EA3, 3.2.0SG, 3.3.2SE, 12.2(55)SE8, 15.2(4)E, 15.6(2)T1, 12.2(60)EZ9, 12.2(52)EY4, 15.0(2)EX, 15.6(2)T2, 15.0(2)SE5, 12.2(60)EZ11, 15.0(2)SE9, 3.7.1E, 15.2(4)M5, 15.0(2)SG1, 15.2(2)EA, 3.3.1SQ, 15.3(3)M9, 12.2(60)EZ, 3.6.1E, 15.2(4)E2, 15.3(3)M7, 15.2(1)E1, 15.2(4)EC2, 15.0(2)SE7, 15.2(4)M4, 12.2(54)WO, 15.0(2)SG8, 3.2.2SG, 15.2(4)EC1, 12.2(53)SE1, 15.2(2)EB2, 15.2(2)E, 3.6.5bE, 3.3.0SQ, 15.4(1)SY2, 12.2(50)SG4, 3.3.2SG, 15.3(3)M8a, 12.2(55)SE5, 15.2(4)M, 15.2(4)EA3, 15.3(2)T, 15.1(1)SG2, 15.1(2)SG, 15.5(2)T4, 15.4(2)T1, 15.0(2)SQD2, 3.4.1SG, 15.2(2)E6, 3.5.0E, 3.3.0SG, 15.6(3)M1b, 3.3.4SE, 3.5.3E, 12.2(55)EZ, 15.0(2)SG7, 12.2(52)EX, 17.11.99SW, 3.2.3SG, 15.1(2)SG8, 15.0(2)EX10, 15.2(2)EA2, 15.0(1)SE3, 12.2(50)SG5, 15.3(3)M1, 3.7.5E, 3.4.7SG, 12.2(50)SG7, 12.2(33)SXI, 3.2.2SE, 12.2(53)SG6, 16.5.1, 3.6.4E, 12.2(58)EY1, 15.5(2)T, 16.1.1, 15.2(3a)E, 3.5.1SQ, 15.4(2)T3, 12.2(53)EY, 15.3(1)T, 12.2(58)EY, 12.2(50)SE4, 15.0(2)EX5, 15.2(5)E, 15.2(4)M9, 15.2(1)SY4, 15.0(2)EX3, 15.2(4)EA, 12.2(60)EZ10, 15.2(4)M6a, 15.2(1)E3, 15.5(3)M4a, 12.2(52)EY2, 15.2(5)E2, 12.2(53)SG4, 15.0(1)SE1, 15.0(2)SQD1, 15.4(1)CG, 15.4(2)CG, 15.0(2)EK, 3.6.2aE, 15.6(3)M0a, 15.2(2)EB, 15.2(4)M2, 15.2(2)SY, 15.0(2)EJ1, 16.5.1a, 3.5.6SQ, 15.0(2)SE4, 15.2(4)M7, 15.2(1)SY1a, 15.3(1)T2, 12.2(60)EZ8, 15.2(3)GC1, 12.2(52)EY1b, 15.2(4)M1, 15.0(2)EX4, 15.5(3)M2, 15.2(3)E4, 16.3.1, 15.6(3)M, 12.2(53)SG10, 12.2(50)SQ7, 12.2(54)SE, 12.2(53)SG, 15.5(3)M5, 15.2(2)E5b, 15.2(2)GC, 3.4.8SG, 3.7.3E, 12.2(52)EY2a, 3.9.2E, 3.4.4SG, 12.2(55)SE4, 15.2(1)SY, 12.2(52)EY, 3.2.3SE, 12.2(50)SE1, 12.2(58)SE2, 15.2(4)EA5, 16.4.1, 12.2(55)SE2, 15.4(1)SY1, 12.2(53)SG9, 15.3(2)T3, 16.3.2, 12.2(55)SE, 15.5(3)M3, 12.2(52)SE1, 15.2(5c)E, 15.0(2)EY, 15.2(2)E2, 12.2(50)SG2, 15.0(2)EX2, 15.6(1)T0a, 15.2(3)E2, 12.2(55)EX1, 15.2(1)SY3, 15.2(5)EA, 12.2(55)SE7, 15.0(2)SG2, 15.3(2)T1, 16.3.3, 12.2(52)XO, 15.2(2a)E2, 15.2(2)E5a, 15.0(2)SG9, 3.4.5SG, 12.2(60)EZ7, 12.2(50)SQ, 15.4(2)T2, 15.5(3)M0a, 12.2(55)SE6, 12.2(52)EY1c, 15.0(2)SQD4, 15.2(4)GC2, 15.5(1)T3, 3.3.3SE, 15.2(1)EY, 15.0(2a)EX5, 15.3(1)T1, 15.5(1)T1, 15.0(2)SE10a, 12.2(50)SQ1, 15.0(2)EA, 12.2(58)SE1, 12.2(50)SQ4, 15.1(2)SG2, 12.2(50)SQ3, 15.1(2)SG6, 15.0(2)EZ, 12.2(50)SE3, 15.5(1)T2, 12.2(60)EZ3, 15.0(2)XO, 3.6.5E, 15.0(2)SE3, 15.2(4)JAZ1, 3.18.1aSP, 15.2(1)SY0a, 15.2(3)EA, 3.3.0SE, 15.0(2)SE, 15.3(3)M, 15.1(2)SG5, 15.1(2)SG3, 3.2.7SG, 3.5.2SQ, 12.2(50)SE, 15.4(1)T4, 3.6.5aE, 15.2(4)M3, 15.3(1)SY1, 16.3.1a, 3.2.1SG, 3.4.6SG, 3.4.0SG, 3.5.0SQ, 3.2.4SG, 12.2(52)EY3a, 15.2(4)GC3, 3.5.5SQ, 12.2(33)SXI1, 15.0(1)SE, 15.0(1)EY) est présent sur votre parc.
• Appliquez le correctif ou la version corrigée indiqués dans les références de l'éditeur.
• À défaut de correctif, limitez l'exposition (filtrage réseau, désactivation du composant).
• Automatisez la détection : les agents CVE Heimdall (gratuits, open source) corrèlent l'inventaire de vos serveurs avec la base CVE.

Références

• https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20170629-snmp