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CVE 2017-3736

'There is a carry propagating bug in the x86_64 Montgomery squaring procedure in OpenSSL before 1.0.2m and 1.1.0 before 1.1.0g. No EC algorithms are affected. Analysis suggests that attacks against RSA and DSA as a result of this defect would be very difficult to perform and are not believed likely. Attacks against DH are considered just feasible (although very difficult) because most of the work necessary to deduce information about a private key may be performed offline. The amount of resources required for such an attack would be very significant and likely only accessible to a limited number of attackers. An attacker would additionally need online access to an unpatched system using the target private key in a scenario with persistent DH parameters and a private key that is shared between multiple clients. This only affects processors that support the BMI1, BMI2 and ADX extensions like Intel Broadwell (5th generation) and later or AMD Ryzen.'

ClearCenter response

This issue affects ClearOS 7 but does not affect any version of ClearOS 6.

Short response

This issue was fixed in the backported fixes of versions of:

  • openssl version 1.0.2k-12 and later in ClearOS 7

Long response

This issue was fixed during the maintenance cycle of ClearOS 7. No version of ClearOS 6 has ever been affected by this vulnerability. ClearOS systems that are up to date do not suffer from this vulnerability. Some vulnerability scanning software may report this bug because their only method for determining the issue is to check the http version number since the exploit requires specific web configurations and has not other means for testing vulnerability. In ClearOS, version numbers stay consistent through the product's life-cycle and will produce a false positive on this issue if the testing software considers only the http version and not the ClearOS patch level.

Resolution

If you are running ClearOS 7, please ensure that you are running the latest updates:

yum update

You may also validate your version by running:

rpm -qi httpd

You should validate that you are running:

ClearOS 7
  • openssl version 1.0.2k-12 or later
content/en_us/announcements_cve_cve-2017-3736.txt · Last modified: 2018/10/01 12:47 by dloper

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