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Files from Jens Mueller

Email addressjens.a.mueller at rub.de
First Active2017-01-31
Last Active2019-10-01
Practical Decryption exFiltration: Breaking PDF Encryption
Posted Oct 1, 2019
Authored by Christian Mainka, Vladislav Mladenov, Jens Mueller, Jorg Schwenk, Sebastian Schinzel, Fabian Ising

The Portable Document Format, better known as PDF, is one of the most widely used document formats worldwide, and in order to ensure information confidentiality, this file format supports document encryption. In this paper, the authors analyze PDF encryption and show two novel techniques for breaking the confidentiality of encrypted documents.

tags | paper
MD5 | 07a85b3d5850b0d07bc74cd4e5fcc956
rack-cors Missing Anchor
Posted Jul 12, 2017
Authored by Jens Mueller

A missing anchor in generated regex for rack-cors versions prior to 0.4.1 allows a malicious third-party site to perform CORS requests. If the configuration were intended to allow only the trusted example.com domain name and not the malicious example.net domain name, then example.com.example.net (as well as example.com-example.net) would be inadvertently allowed.

tags | advisory
MD5 | f58087eedd2d9ef6a0c228ce4b805e89
Hacking Printers Advisory 6
Posted Jan 31, 2017
Authored by Jens Mueller

This post is about putting printers out of their misery and destroying the NVRAM through ordinary print jobs.

tags | advisory
MD5 | 88a8b8c7746260f815b5c8426172bbd1
Hacking Printers Advisory 5
Posted Jan 31, 2017
Authored by Jens Mueller

This post is about resetting a printer to factory defaults through ordinary print jobs, therefore bypassing all protection mechanisms like user-set passwords.

tags | advisory
MD5 | 8131dc45aea9ade9b71766990c74e946
Hacking Printers Advisory 4
Posted Jan 31, 2017
Authored by Jens Mueller

This post is about buffer overflows in a printer's LPD daemon and PJL interpreter which leads to denial of service or potentially even to code execution. Multiple printers are affected.

tags | advisory, denial of service, overflow, code execution
MD5 | b18e89a0bfd80e083499631267c03342
Hacking Printers Advisory 3
Posted Jan 31, 2017
Authored by Jens Mueller

This post is about abusing Brother's proprietary PJL extensions to dump the printers NVRAM and gain access to interesting stuff like passwords.

tags | advisory
MD5 | 2819609db094cc0c6192a444ba2c8f34
Hacking Printers Advisory 2
Posted Jan 31, 2017
Authored by Jens Mueller

This post is about accessing a printers file system through ordinary PostScript or PJL based print jobs -- since decades a documented feature of both languages. The attack can be performed by anyone who can print, for example through USB or network. It can even be carried out by a malicious website, using advanced cross site printing techniques in combination with a novel technique we call CORS spoofing.

tags | exploit, spoof
MD5 | 4cd24c1f328a44025060bf70ef6e1c9c
Hacking Printers Advisory 1
Posted Jan 31, 2017
Authored by Jens Mueller

This post is about manipulating and obtaining documents printed by other users, which can be accomplished by infecting the printer with PostScript malware.

tags | exploit
MD5 | 4edfeb39a5dcda64cabb6f3aa141b18f
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