ALERTE - Vulnérabilité dans commutateurs Cisco (20.03.17)

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ALERTE - Vulnérabilité dans commutateurs Cisco (20.03.17)

Messagede pierre » 21 03 2017

ALERTE - Vulnérabilité dans commutateurs Cisco (20.03.17)

Version initiale de l'alerte
20 mars 2017

Sources
Bulletin de sécurité Cisco cisco-sa-20170317-cmp du 17 mars 2017
https://tools.cisco.com/security/center ... 170317-cmp

Cisco IOS CMP Buffer Overflow
https://tools.cisco.com/security/center ... rsion=S972

1 - Risque(s)
exécution de code arbitraire à distance

2 - Systèmes affectés
Les commutateurs Cisco suivants exécutant Cisco IOS ou Cisco IOS XE


Cisco Catalyst 2350-48TD-S Switch
Cisco Catalyst 2350-48TD-SD Switch
Cisco Catalyst 2360-48TD-S Switch
Cisco Catalyst 2918-24TC-C Switch
Cisco Catalyst 2918-24TT-C Switch
Cisco Catalyst 2918-48TC-C Switch
Cisco Catalyst 2918-48TT-C Switch
Cisco Catalyst 2928-24TC-C Switch
Cisco Catalyst 2960-24-S Switch
Cisco Catalyst 2960-24LC-S Switch
Cisco Catalyst 2960-24LT-L Switch
Cisco Catalyst 2960-24PC-L Switch
Cisco Catalyst 2960-24PC-S Switch
Cisco Catalyst 2960-24TC-L Switch
Cisco Catalyst 2960-24TC-S Switch
Cisco Catalyst 2960-24TT-L Switch
Cisco Catalyst 2960-48PST-L Switch
Cisco Catalyst 2960-48PST-S Switch
Cisco Catalyst 2960-48TC-L Switch
Cisco Catalyst 2960-48TC-S Switch
Cisco Catalyst 2960-48TT-L Switch
Cisco Catalyst 2960-48TT-S Switch
Cisco Catalyst 2960-8TC-L Compact Switch
Cisco Catalyst 2960-8TC-S Compact Switch
Cisco Catalyst 2960-Plus 24LC-L Switch
Cisco Catalyst 2960-Plus 24LC-S Switch
Cisco Catalyst 2960-Plus 24PC-L Switch
Cisco Catalyst 2960-Plus 24PC-S Switch
Cisco Catalyst 2960-Plus 24TC-L Switch
Cisco Catalyst 2960-Plus 24TC-S Switch
Cisco Catalyst 2960-Plus 48PST-L Switch
Cisco Catalyst 2960-Plus 48PST-S Switch
Cisco Catalyst 2960-Plus 48TC-L Switch
Cisco Catalyst 2960-Plus 48TC-S Switch
Cisco Catalyst 2960C-12PC-L Switch
Cisco Catalyst 2960C-8PC-L Switch
Cisco Catalyst 2960C-8TC-L Switch
Cisco Catalyst 2960C-8TC-S Switch
Cisco Catalyst 2960CG-8TC-L Compact Switch
Cisco Catalyst 2960CPD-8PT-L Switch
Cisco Catalyst 2960CPD-8TT-L Switch
Cisco Catalyst 2960CX-8PC-L Switch
Cisco Catalyst 2960CX-8TC-L Switch
Cisco Catalyst 2960G-24TC-L Switch
Cisco Catalyst 2960G-48TC-L Switch
Cisco Catalyst 2960G-8TC-L Compact Switch
Cisco Catalyst 2960L-16PS-LL Switch
Cisco Catalyst 2960L-16TS-LL Switch
Cisco Catalyst 2960L-24PS-LL Switch
Cisco Catalyst 2960L-24TS-LL Switch
Cisco Catalyst 2960L-48PS-LL Switch
Cisco Catalyst 2960L-48TS-LL Switch
Cisco Catalyst 2960L-8PS-LL Switch
Cisco Catalyst 2960L-8TS-LL Switch
Cisco Catalyst 2960PD-8TT-L Compact Switch
Cisco Catalyst 2960S-24PD-L Switch
Cisco Catalyst 2960S-24PS-L Switch
Cisco Catalyst 2960S-24TD-L Switch
Cisco Catalyst 2960S-24TS-L Switch
Cisco Catalyst 2960S-24TS-S Switch
Cisco Catalyst 2960S-48FPD-L Switch
Cisco Catalyst 2960S-48FPS-L Switch
Cisco Catalyst 2960S-48LPD-L Switch
Cisco Catalyst 2960S-48LPS-L Switch
Cisco Catalyst 2960S-48TD-L Switch
Cisco Catalyst 2960S-48TS-L Switch
Cisco Catalyst 2960S-48TS-S Switch
Cisco Catalyst 2960S-F24PS-L Switch
Cisco Catalyst 2960S-F24TS-L Switch
Cisco Catalyst 2960S-F24TS-S Switch
Cisco Catalyst 2960S-F48FPS-L Switch
Cisco Catalyst 2960S-F48LPS-L Switch
Cisco Catalyst 2960S-F48TS-L Switch
Cisco Catalyst 2960S-F48TS-S Switch
Cisco Catalyst 2960X-24PD-L Switch
Cisco Catalyst 2960X-24PS-L Switch
Cisco Catalyst 2960X-24PSQ-L Cool Switch
Cisco Catalyst 2960X-24TD-L Switch
Cisco Catalyst 2960X-24TS-L Switch
Cisco Catalyst 2960X-24TS-LL Switch
Cisco Catalyst 2960X-48FPD-L Switch
Cisco Catalyst 2960X-48FPS-L Switch
Cisco Catalyst 2960X-48LPD-L Switch
Cisco Catalyst 2960X-48LPS-L Switch
Cisco Catalyst 2960X-48TD-L Switch
Cisco Catalyst 2960X-48TS-L Switch
Cisco Catalyst 2960X-48TS-LL Switch
Cisco Catalyst 2960XR-24PD-I Switch
Cisco Catalyst 2960XR-24PD-L Switch
Cisco Catalyst 2960XR-24PS-I Switch
Cisco Catalyst 2960XR-24PS-L Switch
Cisco Catalyst 2960XR-24TD-I Switch
Cisco Catalyst 2960XR-24TD-L Switch
Cisco Catalyst 2960XR-24TS-I Switch
Cisco Catalyst 2960XR-24TS-L Switch
Cisco Catalyst 2960XR-48FPD-I Switch
Cisco Catalyst 2960XR-48FPD-L Switch
Cisco Catalyst 2960XR-48FPS-I Switch
Cisco Catalyst 2960XR-48FPS-L Switch
Cisco Catalyst 2960XR-48LPD-I Switch
Cisco Catalyst 2960XR-48LPD-L Switch
Cisco Catalyst 2960XR-48LPS-I Switch
Cisco Catalyst 2960XR-48LPS-L Switch
Cisco Catalyst 2960XR-48TD-I Switch
Cisco Catalyst 2960XR-48TD-L Switch
Cisco Catalyst 2960XR-48TS-I Switch
Cisco Catalyst 2960XR-48TS-L Switch
Cisco Catalyst 2970G-24T Switch
Cisco Catalyst 2970G-24TS Switch
Cisco Catalyst 2975 Switch
Cisco Catalyst 3550 12G Switch
Cisco Catalyst 3550 12T Switch
Cisco Catalyst 3550 24 DC SMI Switch
Cisco Catalyst 3550 24 EMI Switch
Cisco Catalyst 3550 24 FX SMI Switch
Cisco Catalyst 3550 24 PWR Switch
Cisco Catalyst 3550 24 SMI Switch
Cisco Catalyst 3550 48 EMI Switch
Cisco Catalyst 3550 48 SMI Switch
Cisco Catalyst 3560-12PC-S Compact Switch
Cisco Catalyst 3560-24PS Switch
Cisco Catalyst 3560-24TS Switch
Cisco Catalyst 3560-48PS Switch
Cisco Catalyst 3560-48TS Switch
Cisco Catalyst 3560-8PC Compact Switch
Cisco Catalyst 3560C-12PC-S Switch
Cisco Catalyst 3560C-8PC-S Switch
Cisco Catalyst 3560CG-8PC-S Compact Switch
Cisco Catalyst 3560CG-8TC-S Compact Switch
Cisco Catalyst 3560CPD-8PT-S Compact Switch
Cisco Catalyst 3560CX-12PC-S Switch
Cisco Catalyst 3560CX-12PD-S Switch
Cisco Catalyst 3560CX-12TC-S Switch
Cisco Catalyst 3560CX-8PC-S Switch
Cisco Catalyst 3560CX-8PT-S Switch
Cisco Catalyst 3560CX-8TC-S Switch
Cisco Catalyst 3560CX-8XPD-S Switch
Cisco Catalyst 3560E-12D-E Switch
Cisco Catalyst 3560E-12D-S Switch
Cisco Catalyst 3560E-12SD-E Switch
Cisco Catalyst 3560E-12SD-S Switch
Cisco Catalyst 3560E-24PD-E Switch
Cisco Catalyst 3560E-24PD-S Switch
Cisco Catalyst 3560E-24TD-E Switch
Cisco Catalyst 3560E-24TD-S Switch
Cisco Catalyst 3560E-48PD-E Switch
Cisco Catalyst 3560E-48PD-EF Switch
Cisco Catalyst 3560E-48PD-S Switch
Cisco Catalyst 3560E-48PD-SF Switch
Cisco Catalyst 3560E-48TD-E Switch
Cisco Catalyst 3560E-48TD-S Switch
Cisco Catalyst 3560G-24PS Switch
Cisco Catalyst 3560G-24TS Switch
Cisco Catalyst 3560G-48PS Switch
Cisco Catalyst 3560G-48TS Switch
Cisco Catalyst 3560V2-24DC Switch
Cisco Catalyst 3560V2-24PS Switch
Cisco Catalyst 3560V2-24TS Switch
Cisco Catalyst 3560V2-48PS Switch
Cisco Catalyst 3560V2-48TS Switch
Cisco Catalyst 3560X-24P-E Switch
Cisco Catalyst 3560X-24P-L Switch
Cisco Catalyst 3560X-24P-S Switch
Cisco Catalyst 3560X-24T-E Switch
Cisco Catalyst 3560X-24T-L Switch
Cisco Catalyst 3560X-24T-S Switch
Cisco Catalyst 3560X-24U-E Switch
Cisco Catalyst 3560X-24U-L Switch
Cisco Catalyst 3560X-24U-S Switch
Cisco Catalyst 3560X-48P-E Switch
Cisco Catalyst 3560X-48P-L Switch
Cisco Catalyst 3560X-48P-S Switch
Cisco Catalyst 3560X-48PF-E Switch
Cisco Catalyst 3560X-48PF-L Switch
Cisco Catalyst 3560X-48PF-S Switch
Cisco Catalyst 3560X-48T-E Switch
Cisco Catalyst 3560X-48T-L Switch
Cisco Catalyst 3560X-48T-S Switch
Cisco Catalyst 3560X-48U-E Switch
Cisco Catalyst 3560X-48U-L Switch
Cisco Catalyst 3560X-48U-S Switch
Cisco Catalyst 3750 Metro 24-AC Switch
Cisco Catalyst 3750 Metro 24-DC Switch
Cisco Catalyst 3750-24FS Switch
Cisco Catalyst 3750-24PS Switch
Cisco Catalyst 3750-24TS Switch
Cisco Catalyst 3750-48PS Switch
Cisco Catalyst 3750-48TS Switch
Cisco Catalyst 3750E-24PD-E Switch
Cisco Catalyst 3750E-24PD-S Switch
Cisco Catalyst 3750E-24TD-E Switch
Cisco Catalyst 3750E-24TD-S Switch
Cisco Catalyst 3750E-48PD-E Switch
Cisco Catalyst 3750E-48PD-EF Switch
Cisco Catalyst 3750E-48PD-S Switch
Cisco Catalyst 3750E-48PD-SF Switch
Cisco Catalyst 3750E-48TD-E Switch
Cisco Catalyst 3750E-48TD-S Switch
Cisco Catalyst 3750G-12S Switch
Cisco Catalyst 3750G-12S-SD Switch
Cisco Catalyst 3750G-16TD Switch
Cisco Catalyst 3750G-24PS Switch
Cisco Catalyst 3750G-24T Switch
Cisco Catalyst 3750G-24TS Switch
Cisco Catalyst 3750G-24TS-1U Switch
Cisco Catalyst 3750G-48PS Switch
Cisco Catalyst 3750G-48TS Switch
Cisco Catalyst 3750V2-24FS Switch
Cisco Catalyst 3750V2-24PS Switch
Cisco Catalyst 3750V2-24TS Switch
Cisco Catalyst 3750V2-48PS Switch
Cisco Catalyst 3750V2-48TS Switch
Cisco Catalyst 3750X-12S-E Switch
Cisco Catalyst 3750X-12S-S Switch
Cisco Catalyst 3750X-24P-E Switch
Cisco Catalyst 3750X-24P-L Switch
Cisco Catalyst 3750X-24P-S Switch
Cisco Catalyst 3750X-24S-E Switch
Cisco Catalyst 3750X-24S-S Switch
Cisco Catalyst 3750X-24T-E Switch
Cisco Catalyst 3750X-24T-L Switch
Cisco Catalyst 3750X-24T-S Switch
Cisco Catalyst 3750X-24U-E Switch
Cisco Catalyst 3750X-24U-L Switch
Cisco Catalyst 3750X-24U-S Switch
Cisco Catalyst 3750X-48P-E Switch
Cisco Catalyst 3750X-48P-L Switch
Cisco Catalyst 3750X-48P-S Switch
Cisco Catalyst 3750X-48PF-E Switch
Cisco Catalyst 3750X-48PF-L Switch
Cisco Catalyst 3750X-48PF-S Switch
Cisco Catalyst 3750X-48T-E Switch
Cisco Catalyst 3750X-48T-L Switch
Cisco Catalyst 3750X-48T-S Switch
Cisco Catalyst 3750X-48U-E Switch
Cisco Catalyst 3750X-48U-L Switch
Cisco Catalyst 3750X-48U-S Switch
Cisco Catalyst 4000 Supervisor Engine I
Cisco Catalyst 4000/4500 Supervisor Engine IV
Cisco Catalyst 4000/4500 Supervisor Engine V
Cisco Catalyst 4500 Series Supervisor Engine II-Plus
Cisco Catalyst 4500 Series Supervisor Engine II-Plus-TS
Cisco Catalyst 4500 Series Supervisor Engine V-10GE
Cisco Catalyst 4500 Series Supervisor II-Plus-10GE
Cisco Catalyst 4500 Supervisor Engine 6-E
Cisco Catalyst 4500 Supervisor Engine 6L-E
Cisco Catalyst 4900M Switch
Cisco Catalyst 4928 10 Gigabit Ethernet Switch
Cisco Catalyst 4948 10 Gigabit Ethernet Switch
Cisco Catalyst 4948 Switch
Cisco Catalyst 4948E Ethernet Switch
Cisco Catalyst 4948E-F Ethernet Switch
Cisco Catalyst Blade Switch 3020 for HP
Cisco Catalyst Blade Switch 3030 for Dell
Cisco Catalyst Blade Switch 3032 for Dell M1000E
Cisco Catalyst Blade Switch 3040 for FSC
Cisco Catalyst Blade Switch 3120 for HP
Cisco Catalyst Blade Switch 3120X for HP
Cisco Catalyst Blade Switch 3130 for Dell M1000E
Cisco Catalyst C2928-24LT-C Switch
Cisco Catalyst C2928-48TC-C Switch
Cisco Catalyst Switch Module 3012 for IBM BladeCenter
Cisco Catalyst Switch Module 3110 for IBM BladeCenter
Cisco Catalyst Switch Module 3110X for IBM BladeCenter
Cisco Embedded Service 2020 24TC CON B Switch
Cisco Embedded Service 2020 24TC CON Switch
Cisco Embedded Service 2020 24TC NCP B Switch
Cisco Embedded Service 2020 24TC NCP Switch
Cisco Embedded Service 2020 CON B Switch
Cisco Embedded Service 2020 CON Switch
Cisco Embedded Service 2020 NCP B Switch
Cisco Embedded Service 2020 NCP Switch
Cisco Enhanced Layer 2 EtherSwitch Service Module
Cisco Enhanced Layer 2/3 EtherSwitch Service Module
Cisco Gigabit Ethernet Switch Module (CGESM) for HP
Cisco IE 2000-16PTC-G Industrial Ethernet Switch
Cisco IE 2000-16T67 Industrial Ethernet Switch
Cisco IE 2000-16T67P Industrial Ethernet Switch
Cisco IE 2000-16TC Industrial Ethernet Switch
Cisco IE 2000-16TC-G Industrial Ethernet Switch
Cisco IE 2000-16TC-G-E Industrial Ethernet Switch
Cisco IE 2000-16TC-G-N Industrial Ethernet Switch
Cisco IE 2000-16TC-G-X Industrial Ethernet Switch
Cisco IE 2000-24T67 Industrial Ethernet Switch
Cisco IE 2000-4S-TS-G Industrial Ethernet Switch
Cisco IE 2000-4T Industrial Ethernet Switch
Cisco IE 2000-4T-G Industrial Ethernet Switch
Cisco IE 2000-4TS Industrial Ethernet Switch
Cisco IE 2000-4TS-G Industrial Ethernet Switch
Cisco IE 2000-8T67 Industrial Ethernet Switch
Cisco IE 2000-8T67P Industrial Ethernet Switch
Cisco IE 2000-8TC Industrial Ethernet Switch
Cisco IE 2000-8TC-G Industrial Ethernet Switch
Cisco IE 2000-8TC-G-E Industrial Ethernet Switch
Cisco IE 2000-8TC-G-N Industrial Ethernet Switch
Cisco IE 3000-4TC Industrial Ethernet Switch
Cisco IE 3000-8TC Industrial Ethernet Switch
Cisco IE-3010-16S-8PC Industrial Ethernet Switch
Cisco IE-3010-24TC Industrial Ethernet Switch
Cisco IE-4000-16GT4G-E Industrial Ethernet Switch
Cisco IE-4000-16T4G-E Industrial Ethernet Switch
Cisco IE-4000-4GC4GP4G-E Industrial Ethernet Switch
Cisco IE-4000-4GS8GP4G-E Industrial Ethernet Switch
Cisco IE-4000-4S8P4G-E Industrial Ethernet Switch
Cisco IE-4000-4T4P4G-E Industrial Ethernet Switch
Cisco IE-4000-4TC4G-E Industrial Ethernet Switch
Cisco IE-4000-8GS4G-E Industrial Ethernet Switch
Cisco IE-4000-8GT4G-E Industrial Ethernet Switch
Cisco IE-4000-8GT8GP4G-E Industrial Ethernet Switch
Cisco IE-4000-8S4G-E Industrial Ethernet Switch
Cisco IE-4000-8T4G-E Industrial Ethernet Switch
Cisco IE-4010-16S12P Industrial Ethernet Switch
Cisco IE-4010-4S24P Industrial Ethernet Switch
Cisco IE-5000-12S12P-10G Industrial Ethernet Switch
Cisco IE-5000-16S12P Industrial Ethernet Switch
Cisco ME 4924-10GE Switch
Cisco RF Gateway 10
Cisco SM-X Layer 2/3 EtherSwitch Service Module


3 - Résumé
Une vulnérabilité a été découverte dans les commutateurs Cisco. Elle permet à un attaquant de provoquer une exécution de code arbitraire à distance.

4 - Contournement provisoire
Une vulnérabilité dans l'implémentation du Cisco Cluster Management Protocol (CMP) permet une exécution de code à distance dans les commutateurs Cisco exécutant Cisco IOS ou Cisco IOS XE.
Ce protocole utilise le service Telnet afin que les membres d'un groupe puissent dialoguer entre eux.
Cette vulnérabilité est due à deux facteurs.
  1. Le premier est que les communications Telnet sont traitées même si elles proviennent d'en dehors du groupe.
  2. Le deuxième est qu'une session Telnet spécifique à CMP peut provoquer un débordement de tampon.

A noter que le seul fait de commuter une trame comportant une charge malveillante ne suffit pas à déclencher la vulnérabilité, la communication piégée doit être destinée à l'équipement vulnérable.
Cisco n'a pas annoncé de date de sortie d'un correctif de sécurité.

Suivre les bonnes pratiques en matière de sécurité informatique en s'assurant que l'accès aux interfaces d 'administration des équipements réseaux soit restreint à un canal interne de confiance.
Privilégier le protocole SSH à Telnet.

Enfin, si désactiver les communications Telnet n'est pas une option viable, Cisco fournit des règles de détection réseau (cf. section Documentation).

A noter que les règles de détection SNORT 41909 et 41910 sont disponibles gratuitement à condition d'avoir créé un compte Snort. Celles-ci sont contenues dans le fichier server-other.so et sont de type TRUFFLEHUNTER, c'est à dire que leur contenu est dissimulé.

5 - Documentation
Bulletin de sécurité Cisco cisco-sa-20170317-cmp du 17 mars 2017
https://tools.cisco.com/security/center ... 170317-cmp

Cisco IOS CMP Buffer Overflow
https://tools.cisco.com/security/center ... rsion=S972

Snort
https://www.snort.org/downloads

Référence CVE CVE-2017-3881
http://cve.mitre.org/cgi-bin/cvename.cg ... -2017-3881
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