#VU34734 Buffer overflow in OpenWrt - CVE-2019-19945
Published: March 16, 2020 / Updated: August 8, 2020
Vulnerability identifier: #VU34734
Vulnerability risk: Medium
CVSSv4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green
CVE-ID: CVE-2019-19945
CWE-ID: CWE-119
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerable software:
OpenWrt
OpenWrt
Software vendor:
openwrt.org
openwrt.org
Description
The vulnerability allows a remote non-authenticated attacker to perform a denial of service (DoS) attack.
uhttpd in OpenWrt through 18.06.5 and 19.x through 19.07.0-rc2 has an integer signedness error. This leads to out-of-bounds access to a heap buffer and a subsequent crash. It can be triggered with an HTTP POST request to a CGI script, specifying both "Transfer-Encoding: chunked" and a large negative Content-Length value.
Remediation
Install update from vendor's website.