Advisory Details

February 21st, 2018

Microsoft Chakra String Concatenation Integer Overflow Remote Code Execution Vulnerability

ZDI-18-165
ZDI-CAN-5324

CVE ID CVE-2018-0758
CVSS SCORE 6.8, AV:N/AC:M/Au:N/C:P/I:P/A:P
AFFECTED VENDORS Microsoft
AFFECTED PRODUCTS Chakra
VULNERABILITY DETAILS


This vulnerability allows remote attackers to execute arbitrary code on vulnerable installations of Microsoft Chakra. User interaction is required to exploit this vulnerability in that the target must visit a malicious page or open a malicious file.

The specific flaw exists within the generation of JIT code for functions that perform string concatenations. By performing actions in JavaScript, an attacker can trigger an integer overflow before allocating a buffer. An attacker can leverage this vulnerability to execute code under the context of the current process.

ADDITIONAL DETAILS Microsoft has issued an update to correct this vulnerability. More details can be found at:
https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2018-0758
DISCLOSURE TIMELINE
  • 2017-11-07 - Vulnerability reported to vendor
  • 2018-02-21 - Coordinated public release of advisory
  • 2018-02-21 - Advisory Updated
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