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Apache Mod_Proxy Remote Negative Content-Length Buffer Overflow Vulnerability

A remote buffer overflow vulnerability exists in Apache mod_proxy.

The source of this issue is that a negative user-specified length value may be used in a memory copy operation, allowing for corruption of memory. This may triggered if a remote server returns a negative Content-Length: HTTP header field to be passed through the proxy.

Exploitation will likely result in a denial of service, though there is an unconfirmed potential for execution of arbitrary code on some platforms (such as BSD implementations). Versions that have the optional AP_ENABLE_EXCEPTION_HOOK define enabled may also be exploitable on some platforms.

This issue affects Apache servers 1.3.26 through 1.3.32 that have mod_proxy enabled and configured. Apache 2.0.x releases are not affected by this issue.