Headline
CVE-2022-27644: ZDI-22-520
This vulnerability allows network-adjacent attackers to compromise the integrity of downloaded information on affected installations of NETGEAR R6700v3 1.0.4.120_10.0.91 routers. Authentication is not required to exploit this vulnerability. The specific flaw exists within the downloading of files via HTTPS. The issue results from the lack of proper validation of the certificate presented by the server. An attacker can leverage this in conjunction with other vulnerabilities to execute arbitrary code in the context of root. Was ZDI-CAN-15797.
March 23rd, 2022
(Pwn2Own) NETGEAR R6700v3 Improper Certificate Validation Vulnerability****ZDI-22-520
ZDI-CAN-15797
CVE ID
CVE-2022-27644
CVSS SCORE
5.0, (AV:A/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L)
AFFECTED VENDORS
NETGEAR
AFFECTED PRODUCTS
R6700v3
VULNERABILITY DETAILS
This vulnerability allows network-adjacent attackers to compromise the integrity of downloaded information on affected installations of NETGEAR R6700v3 routers. Authentication is not required to exploit this vulnerability.
The specific flaw exists within the downloading of files via HTTPS. The issue results from the lack of proper validation of the certificate presented by the server. An attacker can leverage this in conjunction with other vulnerabilities to execute arbitrary code in the context of root.
ADDITIONAL DETAILS
NETGEAR has issued an update to correct this vulnerability. More details can be found at:
https://kb.netgear.com/000064721/Security-Advisory-for-Multiple-Vulnerabilities-on-Multiple-Products-PSV-2021-0324
DISCLOSURE TIMELINE
- 2021-12-01 - Vulnerability reported to vendor
- 2022-03-23 - Coordinated public release of advisory
CREDIT
Kevin Denis (@0xmitsurugi) and Antide Petit (@xarkes_) from @Synacktiv
BACK TO ADVISORIES
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This vulnerability allows network-adjacent attackers to execute arbitrary code on affected installations of NETGEAR R6700v3 1.0.4.120_10.0.91 routers. Although authentication is required to exploit this vulnerability, the existing authentication mechanism can be bypassed. The specific flaw exists within the circled daemon. A crafted circleinfo.txt file can trigger an overflow of a fixed-length stack-based buffer. An attacker can leverage this vulnerability to execute code in the context of root. Was ZDI-CAN-15879.
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