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paloaltoPalo Alto Networks Product Security Incident Response TeamPAN-SA-2017-0032
HistoryJan 02, 2018 - 6:09 p.m.

ROBOT attack against PAN-OS

2018-01-0218:09:00
Palo Alto Networks Product Security Incident Response Team
securityadvisories.paloaltonetworks.com
508

CVSS2

4.3

Attack Vector

NETWORK

Attack Complexity

MEDIUM

Authentication

NONE

Confidentiality Impact

PARTIAL

Integrity Impact

NONE

Availability Impact

NONE

AV:N/AC:M/Au:N/C:P/I:N/A:N

CVSS3

5.9

Attack Vector

NETWORK

Attack Complexity

HIGH

Privileges Required

NONE

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

HIGH

Integrity Impact

NONE

Availability Impact

NONE

CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N

EPSS

0.002

Percentile

59.5%

ROBOT is an attack that affects the TLS RSA key exchange and could lead to decryption of captured sessions if the TLS server originally serving said captured session is still alive, vulnerable and using the same private key. (PAN-89936 / CVE-2017-17841)
While SSL Decryption and GlobalProtect are susceptible to this issue, PAN-OS can be protected with use of content update 757, and further mitigated through the configuration changes described below under “Workarounds and Mitigations”.
This issue affects PAN-OS 6.1.19 and earlier, PAN-OS 7.1.14 and earlier, PAN-OS 8.0.6-h3 and earlier

Work around:
Customers running PAN-OS 7.1 or later can configure their SSL Decryption profiles to disable RSA. If the GlobalProtect server certificate is using RSA, customers running PAN-OS 7.1 or later can opt to replace this certificate with one implementing the Elliptic Curve DSA algorithm as a safer alternative. In addition, Palo Alto Networks has released content update 757 which includes a vulnerability signature (“TLS Network Security Protocol Information Disclosure Vulnerability - ROBOT”, #38407) that can be used as an interim mitigation to protect PAN-OS devices until the software is upgraded. For complete protection, signature #38407 must be applied upstream from any interfaces implementing SSL Decryption, or hosting a GlobalProtect portal or a GlobalProtect gateway.

CVSS2

4.3

Attack Vector

NETWORK

Attack Complexity

MEDIUM

Authentication

NONE

Confidentiality Impact

PARTIAL

Integrity Impact

NONE

Availability Impact

NONE

AV:N/AC:M/Au:N/C:P/I:N/A:N

CVSS3

5.9

Attack Vector

NETWORK

Attack Complexity

HIGH

Privileges Required

NONE

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

HIGH

Integrity Impact

NONE

Availability Impact

NONE

CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N

EPSS

0.002

Percentile

59.5%