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Date: Mon, 28 Feb 2011 14:40:36 -0500
From: Dan Rosenberg <>
Cc: Helgi Þormar Þorbjörnsson <>
Subject: Re: CVE Request: PEAR Installer 1.9.1 <= - Symlink Attack

I'm not familiar with this code or any of the context surrounding this
fix, but it appears to be an incomplete fix.  Checking for existence
of a symlink and then opening the resource leaves open a window during
which a legitimate file can be replaced with a symlink.  Also, I don't
see a reason why a hard link couldn't be used for exploitation


2011/2/28 Helgi Þormar Þorbjörnsson <>:
> The lack of symlink checks in the PEAR installer 1.9.1 <= while doing
> installation and upgrades, which initiate various system write
> operations, can cause privileged users unknowingly to overwrite
> critical system files.
> Further information can be found in this temporary advisory
> and the
> Fixes can be found at
> - Helgi

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