SB2020031626 - Buffer overflow in OpenWrt
Published: March 16, 2020 Updated: August 8, 2020
Security Bulletin ID
SB2020031626
Severity
Medium
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Remote access
Highest impact
Denial of service
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 security vulnerability.
1) Buffer overflow (CVE-ID: CVE-2019-19945)
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.