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3proxy: Denial of Service


1.  Gentoo Linux Security Advisory

Version Information

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


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

2.  Impact Information


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


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.


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


There is no known workaround at this time.


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


Page updated November 08, 2007

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