FreeBSD : portupgrade -- insecure temporary file handling vulnerability (22f00553-a09d-11d9-a788-0001020eed82)

This script is Copyright (C) 2005-2013 Tenable Network Security, Inc.

Synopsis :

The remote FreeBSD host is missing a security-related update.

Description :

Simon L. Nielsen discovered that portupgrade handles temporary files
in an insecure manner. This could allow an unprivileged local attacker
to execute arbitrary commands or overwrite arbitrary files with the
permissions of the user running portupgrade, typically root, by way of
a symlink attack.

The following issues exist where the temporary files are created, by
default in the world writeable directory /var/tmp, with the
permissions of the user running portupgrade :

- pkg_fetch download packages with a predictable local filename
allowing a local attacker to overwrite arbitrary local files or
potentially replace the downloaded package after download but before
install with a package with malicious content, allowing the attacker
to run arbitrary commands.

- portupgrade will, when upgrading ports/packages, write the old
package to a predictable temporary file, allowing an attacker to
overwrite arbitrary files via a symlink attack.

- portupgrade will touch a temporary file with a constant filename
(pkgdb.fixme) allowing an attacker to create arbitrary zero-byte files
via a symlink attack.

A workaround for these issues is to set the PKG_TMPDIR environment
variable to a directory only write-able by the user running

See also :

Solution :

Update the affected package.

Risk factor :

High / CVSS Base Score : 7.2

Family: FreeBSD Local Security Checks

Nessus Plugin ID: 18868 (freebsd_pkg_22f00553a09d11d9a7880001020eed82.nasl)

Bugtraq ID:

CVE ID: CVE-2005-0610

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