Description
GD versions before 2.86 for Perl allow OS command injection and file overwrite via a 2-arg open() of filename arguments in _make_filehandle. GD::Image::_make_filehandle opens a filename argument with Perl's 2-arg open(), so a filename that begins or ends with a pipe ("| cmd", "cmd |") or begins with a redirect ("> path", ">> path") is run as a command or redirect rather than opened as a file. _make_filehandle is the single open path behind every filename-accepting constructor (new, newFromPng, newFromJpeg, and the rest); the in-memory *Data variants do not open a path and are unaffected. Any caller that forwards untrusted input to one of these constructors as a pathname can run an arbitrary command or truncate a file under the process UID.
Problem types
CWE-78 Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')
CWE-73 External Control of File Name or Path
Product status
Any version before 2.86
References
github.com/...67b163713c6c78dfeb693da0978ae934e5cd8210.patch
metacpan.org/release/RURBAN/GD-2.86/changes