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noweb: Insecure temporary file creation


1.  Gentoo Linux Security Advisory

Version Information

Advisory Reference GLSA 200602-14 / noweb
Release Date February 26, 2006
Latest Revision February 26, 2006: 01
Impact normal
Exploitable local
Package Vulnerable versions Unaffected versions Architecture(s)
app-text/noweb < 2.9-r5 >= 2.9-r5 All supported architectures

Related bugreports: #122705


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

2.  Impact Information


noweb is a simple, extensible, and language independent literate programming tool.


Javier Fernandez-Sanguino has discovered that the lib/toascii.nw and shell/ scripts insecurely create temporary files with predictable filenames.


A local attacker could create symbolic links in the temporary file directory, pointing to a valid file somewhere on the filesystem. When an affected script is called, this would result in the file being overwritten with the rights of the user running the script.

3.  Resolution Information


There is no known workaround at this time.


All noweb users should upgrade to the latest version:

Code Listing 3.1: Resolution

# emerge --sync
# emerge --ask --oneshot --verbose ">=app-text/noweb-2.9-r5"

4.  References


Page updated February 26, 2006

Summary: This is a Gentoo Linux Security Advisory

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