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Perl: Insecure temporary file creation


1.  Gentoo Linux Security Advisory

Version Information

Advisory Reference GLSA 200412-04 / perl
Release Date December 07, 2004
Latest Revision December 07, 2004: 01
Impact normal
Exploitable local
Package Vulnerable versions Unaffected versions Architecture(s)
dev-lang/perl < 5.8.5-r2, = 5.8.6 revision >= 5.8.5-r2, >= 5.8.6-r1 All supported architectures

Related bugreports: #66360


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

2.  Impact Information


Perl is a stable, cross-platform programming language created by Larry Wall.


Some Perl modules create temporary files in world-writable directories with predictable names.


A local attacker could create symbolic links in the temporary files directory, pointing to a valid file somewhere on the filesystem. When a Perl script is executed, this would result in the file being overwritten with the rights of the user running the utility, which could be the root user.

3.  Resolution Information


There is no known workaround at this time.


All Perl users should upgrade to the latest version:

Code Listing 3.1: Resolution

# emerge --sync
# emerge --ask --oneshot --verbose ">=perl-5.8.5-r2"

4.  References


Page updated December 07, 2004

Summary: This is a Gentoo Linux Security Advisory

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