Integer Signedness Error in OpenWrt's uhttpd Affects Multiple Versions
CVE-2019-19945

7.5HIGH

Key Information:

Vendor

Openwrt

Status
Openwrt
Vendor
CVE Published:
16 March 2020

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2019-19945?

The uhttpd web server in OpenWrt, specifically in versions up to 18.06.5 and 19.x until 19.07.0-rc2, is affected by an integer signedness error. This vulnerability enables out-of-bounds access to a heap buffer, potentially leading to server crashes. Attackers can exploit this issue by sending an HTTP POST request to a CGI script with 'Transfer-Encoding: chunked' accompanied by a large negative Content-Length value, causing the server to malfunction.

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Exploit Proof of Concept (PoC)

PoC code is written by security researchers to demonstrate the vulnerability can be exploited. PoC code is also a key component for weaponization which could lead to ransomware.

CVE-2019-19945_Test
Created by delicateByte

References

https://github.com/openwrt/openwrt/commits/master
x_refsource_MISC
https://openwrt.org/advisory/2020-01-13-1
x_refsource_CONFIRM

CVSS V3.1

Score:
7.5
Severity:
HIGH
Confidentiality:
None
Integrity:
None
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • 🟡

    Public PoC available

  • 👾

    Exploit known to exist

  • Vulnerability published

  • Vulnerability Reserved

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