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1.9 KiB
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46 lines
No EOL
1.9 KiB
Text
source: https://www.securityfocus.com/bid/11968/info
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CUPS is reported prone to a remote buffer overflow vulnerability. The issue is reported to exist in the 'hpgl-input.c' source file and is because of a lack of sufficient boundary checks performed on data contained in HPGL files.
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A remote attacker may exploit this condition to execute arbitrary code in the context of the vulnerable CUPS daemon.
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https://gitlab.com/exploit-database/exploitdb-bin-sploits/-/raw/main/bin-sploits/24977.gz
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Ariel Berkman, a student in my Fall 2004 UNIX Security Holes course, has
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discovered a remotely exploitable security hole in CUPS. I'm publishing
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this notice, but all the discovery credits should be assigned to
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Berkman.
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A CUPS installation is at risk whenever it prints an HPGL file obtained
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from email (or a web page or any other source that could be controlled
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by an attacker). You are at risk if you print data through a CUPS
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installation at risk. The source of the HPGL file has complete control
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over the CUPS ``lp'' account; in particular, he can read and modify the
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files you are printing.
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Proof of concept: On an x86 computer running FreeBSD 4.10, as root, type
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cd /usr/ports/print/cups
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make install
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to download and compile the CUPS package, version 1.1.22 (current).
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Then, as any user, save the file 21.hpgl.gz attached to this message,
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and type
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gunzip 21.hpgl
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/usr/local/libexec/cups/filter/hpgltops \
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15 $USER test-title 1 none 21.hpgl > 21.ps
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with the unauthorized result that a file named x is removed from the
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current directory. (I tested this with a 541-byte environment, as
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reported by printenv | wc -c.)
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Here's the bug: In hpgl-input.c, ParseCommand() reads any number of
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bytes into a 262144-byte buf[] array.
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---D. J. Bernstein, Associate Professor, Department of Mathematics,
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Statistics, and Computer Science, University of Illinois at Chicago
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Source: http://securesoftware.list.cr.yp.to/archive/0/25 |