CVE-2009-0840 Memory corruption in n/a

Critical 10.0 Published 31 Mar 2009 Updated 7 Aug 2024

Remote attackers can trigger a heap-based buffer underflow in MapServer via a negative Content-Length header, potentially causing crashes or code execution.

Exploited in the wild: Not known
Login needed: Not needed
Attackable: Over the internet
Victim action needed: Not needed
Fix: Available

What is CVE-2009-0840?

CVE-2009-0840 is a critical memory corruption vulnerability in n/a, published on 31 Mar 2009. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

Heap-based buffer underflow in the readPostBody function in cgiutil.c in mapserv in MapServer 4.x before 4.10.4 and 5.x before 5.2.2 allows remote attackers to have an unknown impact via a negative value in the Content-Length HTTP header.

Weakness: CWE-119

Which versions are affected by CVE-2009-0840?

It affects 2 products.

Products include Osgeo Mapserver, Umn Mapserver.

How do I fix CVE-2009-0840?

Upgrade to a fixed version.

Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.

Is CVE-2009-0840 being exploited?

There is no known exploitation of CVE-2009-0840 in the wild and no public exploit code.

Sources

Also known as DEBIAN-CVE-2009-0840, GHSA-53rh-gvx6-42x8.