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LutelWall: Insecure temporary file creation


1.  Gentoo Linux Security Advisory

Version Information

Advisory Reference GLSA 200506-10 / LutelWall
Release Date June 11, 2005
Latest Revision June 11, 2005: 01
Impact normal
Exploitable local
Package Vulnerable versions Unaffected versions Architecture(s)
net-firewall/lutelwall < 0.98 >= 0.98 All supported architectures

Related bugreports: #95378


LutelWall is vulnerable to symlink attacks, potentially allowing a local user to overwrite arbitrary files.

2.  Impact Information


LutelWall is a high-level Linux firewall configuration tool.


Eric Romang has discovered that the new_version_check() function in LutelWall insecurely creates a temporary file when updating to a new version.


A local attacker could create symbolic links in the temporary file directory, pointing to a valid file somewhere on the filesystem. When the update script is executed (usually by the root user), this would result in the file being overwritten with the rights of this user.

3.  Resolution Information


There is no known workaround at this time.


All LutelWall users should upgrade to the latest version:

Code Listing 3.1: Resolution

# emerge --sync
# emerge --ask --oneshot --verbose ">=net-firewall/lutelwall-0.98"

4.  References


Page updated June 11, 2005

Summary: This is a Gentoo Linux Security Advisory

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