CVE-2009-1890 Denial of service in n/a
Remote attackers can cause CPU exhaustion and denial of service in Apache HTTP Server reverse proxies by sending crafted requests with mismatched Content-Length headers.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2009-1890?
CVE-2009-1890 is a high-severity denial of service vulnerability in Apache Http Server, published on 5 Jul 2009. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
The stream_reqbody_cl function in mod_proxy_http.c in the mod_proxy module in the Apache HTTP Server before 2.3.3, when a reverse proxy is configured, does not properly handle an amount of streamed data that exceeds the Content-Length value, which allows remote attackers to cause a denial of service (CPU consumption) via crafted requests.
Weakness: CWE-400
Which versions are affected by CVE-2009-1890?
It affects 9 products.
Products include Apache Http Server, Canonical Ubuntu Linux, Debian Debian Linux, Fedoraproject Fedora, Redhat Enterprise Linux Desktop, Redhat Enterprise Linux Eus and 3 more.
How do I fix CVE-2009-1890?
Upgrade to a fixed version.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2009-1890 being exploited?
There is no known exploitation of CVE-2009-1890 in the wild and no public exploit code.
Other vulnerabilities in Apache Http Server
Sources
Also known as DEBIAN-CVE-2009-1890, GHSA-wvqw-w5hq-v4m4.