Remote denial of service in SymCrypt library in Microsoft Windows

Published: 2019-06-13 10:15:16 | Updated: 2019-06-13
Severity Medium
Patch available NO
Number of vulnerabilities 1
CVE ID N/A
CVSSv3 5.6 [CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H/E:P/RL:U/RC:C]
CWE ID CWE-310
Exploitation vector Network
Public exploit Public exploit code for vulnerability #1 is available.
Vulnerable software SymCrypt
Windows
Windows Server
Vulnerable software versions SymCrypt -
Windows 10 1903
Windows 10 1809
Windows 10 1803

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Windows Server 1903
Windows Server 1803
Windows Server 1709

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Vendor URL Microsoft

Security Advisory

1) Cryptographic issues

Description

The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to an error when calculating the modular inverse on specific bit patterns with bcryptprimitives!SymCryptFdefModInvGeneric() function when processing X.509 certificates. A remote attacker can supply a specially crafted X.509 certificate to the affected system and trigger denial of service conditions.

Any application that uses the vulnerable library, e.g. antivirus software is susceptible to this issue.


Remediation

Install updates from vendor's website.

External links

https://bugs.chromium.org/p/project-zero/issues/detail?id=1804

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