Date: Fri, 31 Aug 2012 20:23:32 +0200 From: Jakub Wilk <jwilk@...ian.org> To: oss-security@...ts.openwall.com Subject: Re: [Notification] CVE-2012-3500 - rpmdevtools, devscripts: TOCTOU race condition in annotate-output * Jan Lieskovsky <jlieskov@...hat.com>, 2012-08-31, 11:22: >A TOCTOU race condition was found in the way 'annotate-output' (used to >execute a program annotating the output linewise with time and stream) >tool of rpmdevtools, a suite of scripts and (X)Emacs support files to >aid in development of RPM packages, performed management of its >temporary files used for standard output and standard error output. A >local attacker could use this flaw to conduct symbolic link attacks, >possibly leading to their ability in an unauthorized way to alter files >belonging to the user running the 'annotate-output' tool. The vulnerable code appears to be: OUT=`mktemp --tmpdir annotate.XXXXXX` || exit 1 ERR=`mktemp --tmpdir annotate.XXXXXX` || exit 1 rm -f $OUT $ERR mkfifo $OUT $ERR || exit 1 But mkfifo will never create a FIFO over a symlink; the underlying library function fails with EEXISTS when "pathname already exists. This includes the case where pathname is a symbolic link, dangling or not." So AFAICS it's just a DoS, not something giving the attacker "ability in an unauthorized way to alter files". -- Jakub Wilk
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