There are no known workarounds for this vulnerability. Due to an Incorrect Check of Function Return Value bug Squid is vulnerable to a Denial of Service attack against its Helper process management. Squid is a caching proxy for the Web supporting HTTP, HTTPS, FTP, and more. Users unable to upgrade should remove all collapsed_forwarding lines from their nf. This bug is fixed by Squid version 6.0.1. Configurations with "collapsed_forwarding off" or without a "collapsed_forwarding" directive are not vulnerable. All versions of Squid from 3.5 up to and including 5.9 configured with "collapsed_forwarding on" are vulnerable. Affected versions of squid are subject to a a Use-After-Free bug which can lead to a Denial of Service attack via collapsed forwarding. Make_ftp_cmd in main.c in ProFTPD before 1.3.8a has a one-byte out-of-bounds read, and daemon crash, because of mishandling of quote/backslash semantics.
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