PT-2019-5515 · Openwrt · Openwrt

Jan-Niklas Sohn · Published 2019-12-22 · Updated 2023-05-24 · CVE-2019-19945

Positive Technologies (AI Summary)

CVSS v2.0

7.8

High

Base vector

AV:N/AC:L/Au:N/C:N/I:N/A:C

Name of the Vulnerable Software and Affected Versions OpenWrt versions 18.06.0 through 18.06.5 OpenWrt versions 19.0 through 19.07.0-rc2

Description The issue is related to an integer signedness error in the uhttpd function of the OpenWrt embedded operating system, which can lead to out-of-bounds access to a heap buffer and cause a crash. This can be triggered by a remote attacker using a specially crafted HTTP POST request to a CGI script, specifying both "Transfer-Encoding: chunked" and a large negative Content-Length value.

Recommendations For OpenWrt versions 18.06.0 through 18.06.5, update to a version later than 18.06.5 to resolve the issue. For OpenWrt versions 19.0 through 19.07.0-rc2, update to a version later than 19.07.0-rc2 to resolve the issue. As a temporary workaround, consider restricting access to CGI scripts or disabling the uhttpd function until a patch is available.

Fix

Buffer Overflow

Out of bounds Read

Weakness Enumeration

CWE-119

CWE-125

CWE-681

Related Identifiers

BDU:2020-03444

CVE-2019-19945

Affected Products

Openwrt

References · 7

• https://github.com/openwrt/openwrt/commits/master · Patch
• https://bdu.fstec.ru/vul/2020-03444 · Security Note
• https://osv.dev/vulnerability/CVE-2019-19945 · Vendor Advisory
• https://openwrt.org/advisory/2020-01-13-1 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2019-19945 · Security Note
• https://t.me/cvenotify/51045 · Telegram Post
• https://t.me/cvenotify/1766 · Telegram Post