Out-of-bounds write in multiple NETGEAR Routers

1) Out-of-bounds write

EUVDB-ID: #VU56975

Risk: Medium

CVSSv4.0: 6.3 [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/E:U/U:Green]

CVE-ID: CVE-2021-34947

CWE-ID: CWE-787 - Out-of-bounds write

Exploit availability: No

Description

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.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

R6700AX: before 1.0.5.108

R7800: before 1.0.2.84

R8900: before 1.0.5.36

R9000: before 1.0.5.36

RAX10: before 1.0.5.108

RAX120: before 1.2.2.24

RAX120v2: before 1.2.2.24

RAX70: before 1.0.5.108

RAX78: before 1.0.5.108

XR700: before 1.0.1.44

CPE2.3

• cpe:2.3:h:netgear:r6700ax:*:*:*:*:*:*:*:*
• cpe:2.3:h:netgear:r7800:*:*:*:*:*:*:*:*
• cpe:2.3:h:netgear:r8900:*:*:*:*:*:*:*:*
• cpe:2.3:h:netgear:r9000:*:*:*:*:*:*:*:*
• cpe:2.3:h:netgear:rax10:*:*:*:*:*:*:*:*
• cpe:2.3:h:netgear:rax120:*:*:*:*:*:*:*:*
• cpe:2.3:h:netgear:rax120v2:*:*:*:*:*:*:*:*
• cpe:2.3:h:netgear:rax70:*:*:*:*:*:*:*:*
• cpe:2.3:h:netgear:rax78:*:*:*:*:*:*:*:*
• cpe:2.3:h:netgear:xr700:*:*:*:*:*:*:*:*

External links

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

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the local network (LAN).

How the attacker can exploit this vulnerability?

The attacker would have to send a specially crafted request to the affected device in order to exploit this vulnerability.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.