Advisory Details

November 10th, 2020

Cisco WebEx Network Recording Player ARF File Parsing Stack-based Buffer Overflow Remote Code Execution Vulnerability

ZDI-20-1363
ZDI-CAN-11175

CVE ID CVE-2020-3604
CVSS SCORE 7.8, AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
AFFECTED VENDORS Cisco
AFFECTED PRODUCTS WebEx
VULNERABILITY DETAILS

This vulnerability allows remote attackers to execute arbitrary code on affected installations of Cisco WebEx Network Recording Player. 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 parsing of ARF files. The issue results from the lack of proper validation of the length of user-supplied data prior to copying it to a fixed-length stack-based buffer. An attacker can leverage this vulnerability to execute code in the context of the current process.

ADDITIONAL DETAILS Cisco has issued an update to correct this vulnerability. More details can be found at:
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-webex-nbr-NOS6FQ24
DISCLOSURE TIMELINE
  • 2020-06-10 - Vulnerability reported to vendor
  • 2020-11-10 - Coordinated public release of advisory
CREDIT Francis Provencher {PRL}
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