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Cisco Alert

3250
Classification
These posts contain security alerts, including digital loopholes, electronic attacks, technical updates, and they are classified base on the level of severity.

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حملات تصيدية تستهدف مايكروسوفت تيمز (Microsoft Teams)

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Warning Date

Severity Level

Warning Number

Target Sector

22 December, 2019

● Critical

2019-751

All

Description:

Cisco has released an alert regarding Self-Signed Certificates (SSC) on the following systems:

  • IOS 12.x - All versions
  • IOS 15.x - Versions prior to: 15.6(3)M7, 15.7(3)M5, 15.8(3)M3, 15.9(3)M
  • IOS-XE - Versions prior to: 16.9.1

Threats:

At 00:00 on 1 January 2020 UTC, all Self-Signed Certificates (SSC) that were generated on IOS/IOS-XE systems will expire. After that time, unfixed IOS systems will be unable to generate new SSCs. Any service that relies on these self-signed certificates might not work.

Best practice and Recommendations:

The CERT team encourages users to update the affected systems:

  • Cisco IOS XE Software Release 16.9.1 and later.
  • Cisco IOS Software Release 15.6(3)M7 and later; 15.7(3)M5 and later; or 15.8(3)M3 and later.

After you upgrade the software, you must regenerate the self-signed certificate by following one of these methods:

  • Obtain a valid certificate from a 3rd part Certificate Authority (CA).
  • Use the IOS CA Server to generate a new certificate.
  • Use OpenSSL to generate a new self-signed certificate.

For more details:

  • https://www.cisco.com/c/en/us/support/docs/security-vpn/public-key-infrastructure-pki/215118-ios-self-signed-certificate-expiration-o.html

Last updated at 7 January, 2020

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