3proxy: Denial of Service

1. Gentoo Linux Security Advisory

Advisory Reference	GLSA 200711-13 / 3proxy
Release Date	November 08, 2007
Latest Revision	November 08, 2007: 01
Impact	normal
Exploitable	remote

Package	Vulnerable versions	Unaffected versions	Architecture(s)
net-proxy/3proxy	< 0.5.3j	>= 0.5.3j	All supported architectures

Related bugreports: #196772

Synopsis

A vulnerability has been discovered in 3proxy, possibly resulting in a Denial of Service.

2. Impact Information

Background

3proxy is a really tiny cross-platform proxy servers set, including HTTP, HTTPS, FTP, SOCKS and POP3 support.

Description

3proxy contains a double free vulnerability in the ftpprchild() function, which frees param->hostname and calls the parsehostname() function, which in turn attempts to free param->hostname again.

Impact

A remote attacker could send a specially crafted request to the proxy, possibly resulting in a Denial of Service. Under typical configuration, the scope of this vulnerability is limited to the local network.

3. Resolution Information

Workaround

There is no known workaround at this time.

Resolution

All 3proxy users should upgrade to the latest version:

Code Listing 3.1: Resolution

# emerge --sync
# emerge --ask --oneshot --verbose ">=net-proxy/3proxy-0.5.3j"

4. References

CVE-2007-5622

Page updated November 08, 2007

Summary: This is a Gentoo Linux Security Advisory

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