Out-of-bounds write in NETGEAR products - CVE-2021-34947

Vulnerability identifier: #VU56975

CSH Severity: Medium

CVSS v4: 8.7 [CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]

CVE-ID: CVE-2021-34947

CWE-ID: CWE-787

Exploitation vector: Adjecent network

Exploit availability: No public exploit available

The vulnerability allows a remote attacker to compromise vulnerable system.

The vulnerability exists due to a boundary error within the parsing of the soap_block_table file. A remote attacker on the local network can trigger out-of-bounds write and execute arbitrary code on the target system.

R6700AX
R7800
R8900
R9000
RAX10
RAX120
RAX120v2
RAX70
RAX78
XR700

Install updates from vendor's website.

R6700AX - update to 1.0.5.108
R7800 - update to 1.0.2.84
R8900 - update to 1.0.5.36
R9000 - update to 1.0.5.36
RAX10 - update to 1.0.5.108
RAX120 - update to 1.2.2.24
RAX120v2 - update to 1.2.2.24
RAX70 - update to 1.0.5.108
RAX78 - update to 1.0.5.108
XR700 - update to 1.0.1.44

• https://www.zerodayinitiative.com/advisories/ZDI-21-1116/
• https://kb.netgear.com/000064044/Security-Advisory-for-Pre-Authentication-Buffer-Overflow-on-Some-Routers-PSV-2021-0129

• Out-of-bounds write in multiple NETGEAR Routers