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CVE Vulnerabilities

CVE-2017-1000385

Observable Discrepancy

Published: Dec 12, 2017 | Modified: Nov 21, 2024
CVSS 3.x
5.9
MEDIUM
Source:
NVD
CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N
CVSS 2.x
4.3 MEDIUM
AV:N/AC:M/Au:N/C:P/I:N/A:N
RedHat/V2
RedHat/V3
6.5 LOW
CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:L/A:N
Ubuntu
MEDIUM
Additional information
NVDhttps://nvd.nist.gov/vuln/detail/CVE-2017-1000385
CWEhttps://cwe.mitre.org/data/definitions/203.html

The Erlang otp TLS server answers with different TLS alerts to different error types in the RSA PKCS #1 1.5 padding. This allows an attacker to decrypt content or sign messages with the servers private key (this is a variation of the Bleichenbacher attack).

Weakness

The product behaves differently or sends different responses under different circumstances in a way that is observable to an unauthorized actor, which exposes security-relevant information about the state of the product, such as whether a particular operation was successful or not.

Affected Software

Name Vendor Start Version End Version
Erlang/otp Erlang 18.3.4.7 (including) 18.3.4.7 (including)
Erlang/otp Erlang 19.3.6.4 (including) 19.3.6.4 (including)
Erlang/otp Erlang 20.1.7 (including) 20.1.7 (including)
CloudForms Management Engine 5.10 RedHat ansible-tower-0:3.4.1-2.el7at *
CloudForms Management Engine 5.10 RedHat cfme-0:5.10.1.2-2.el7cf *
CloudForms Management Engine 5.10 RedHat cfme-amazon-smartstate-0:5.10.1.2-1.el7cf *
CloudForms Management Engine 5.10 RedHat cfme-appliance-0:5.10.1.2-1.el7cf *
CloudForms Management Engine 5.10 RedHat cfme-gemset-0:5.10.1.2-1.el7cf *
CloudForms Management Engine 5.10 RedHat erlang-0:20.3.8.9-2.el7at *
CloudForms Management Engine 5.10 RedHat nginx-1:1.14.1-1.el7at *
CloudForms Management Engine 5.10 RedHat rabbitmq-server-0:3.7.4-2.el7at *
Red Hat OpenStack Platform 10.0 (Newton) RedHat erlang-0:18.3.4.7-1.el7ost *
Red Hat OpenStack Platform 11.0 (Ocata) RedHat erlang-0:18.3.4.7-1.el7ost *
Red Hat OpenStack Platform 12.0 (Pike) RedHat erlang-0:18.3.4.7-1.el7ost *
Red Hat OpenStack Platform 9.0 (Mitaka) RedHat erlang-0:18.3.4.7-1.el7ost *
Erlang Ubuntu artful *
Erlang Ubuntu trusty *
Erlang Ubuntu xenial *
Erlang Ubuntu zesty *

Potential Mitigations

  • Compartmentalize the system to have “safe” areas where trust boundaries can be unambiguously drawn. Do not allow sensitive data to go outside of the trust boundary and always be careful when interfacing with a compartment outside of the safe area.
  • Ensure that appropriate compartmentalization is built into the system design, and the compartmentalization allows for and reinforces privilege separation functionality. Architects and designers should rely on the principle of least privilege to decide the appropriate time to use privileges and the time to drop privileges.
  • Ensure that error messages only contain minimal details that are useful to the intended audience and no one else. The messages need to strike the balance between being too cryptic (which can confuse users) or being too detailed (which may reveal more than intended). The messages should not reveal the methods that were used to determine the error. Attackers can use detailed information to refine or optimize their original attack, thereby increasing their chances of success.
  • If errors must be captured in some detail, record them in log messages, but consider what could occur if the log messages can be viewed by attackers. Highly sensitive information such as passwords should never be saved to log files.
  • Avoid inconsistent messaging that might accidentally tip off an attacker about internal state, such as whether a user account exists or not.

References

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