CVE-2020-3603: 
Cisco Webex Meetings vulnerability analysis and mitigation

A high-severity vulnerability (CVE-2020-3603) was discovered in Cisco WebEx Network Recording Player, specifically affecting the Advanced Recording Format (ARF) file parsing functionality. The vulnerability was disclosed on November 10, 2020, with a CVSS score of 7.8. This security flaw affects installations of Cisco WebEx Network Recording Player and requires user interaction for exploitation (ZDI Advisory).

The vulnerability exists within the parsing of ARF files and stems from insufficient validation of user-supplied data, which can result in a write past the end of an allocated buffer. The flaw is classified as CWE-119, indicating a buffer overflow issue. The vulnerability received a CVSS score of 7.8 (AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H), reflecting its high-severity nature (ZDI Advisory).

If successfully exploited, this vulnerability could allow an attacker to execute arbitrary code in the context of the current process. The impact is significant as it could lead to complete compromise of the affected system, with high potential for confidentiality, integrity, and availability breaches (ZDI Advisory).

The vulnerability requires user interaction to exploit, specifically requiring the target to visit a malicious page or open a malicious file. The attack vector is local (AV:L), with low attack complexity (AC:L) and no privileges required (PR:N), though user interaction (UI:R) is necessary (ZDI Advisory).

Cisco has issued updates to address this vulnerability. The fix was released as part of a security update, with version 43.12.1.7 addressing the vulnerability (ManageEngine).

The vulnerability was initially reported to Cisco on June 5, 2020, and was publicly disclosed on November 10, 2020, as part of a coordinated release. The discovery was credited to Francis Provencher {PRL} (ZDI Advisory).