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Files from Marcus Brinkmann

First Active2019-05-01
Last Active2023-12-20
Terrapin SSH Connection Weakening
Posted Dec 20, 2023
Authored by Jorg Schwenk, Marcus Brinkmann, Fabian Baumer | Site terrapin-attack.com

In this paper, the authors show that as new encryption algorithms and mitigations were added to SSH, the SSH Binary Packet Protocol is no longer a secure channel: SSH channel integrity (INT-PST) is broken for three widely used encryption modes. This allows prefix truncation attacks where some encrypted packets at the beginning of the SSH channel can be deleted without the client or server noticing it. They demonstrate several real-world applications of this attack. They show that they can fully break SSH extension negotiation (RFC 8308), such that an attacker can downgrade the public key algorithms for user authentication or turn off a new countermeasure against keystroke timing attacks introduced in OpenSSH 9.5. They also identified an implementation flaw in AsyncSSH that, together with prefix truncation, allows an attacker to redirect the victim's login into a shell controlled by the attacker. Related proof of concept code from their github has been added to this archive.

tags | exploit, paper, shell, protocol, proof of concept
advisories | CVE-2023-46445, CVE-2023-46446, CVE-2023-48795
SHA-256 | 3d6be8cc2a9c624a06990226485956c5d92675a632da2182c2546e4af814ff93
Open-Xchange OX Guard Cross Site Scripting / Signature Validation
Posted Aug 16, 2019
Authored by Hanno Boeck, Juraj Somorovsky, Martin Heiland, Jorg Schwenk, Sebastian Schinzel, Damian Poddebniak, Jens Muller, Marcus Brinkmann

Open-Xchange OX Guard versions 7.10.2 and below suffer from a cross site scripting vulnerability. Open-Xchange OX Guard versions 7.10.1 and below, 2.10.2 and below suffer from a signature validation vulnerability.

tags | exploit, xss
advisories | CVE-2018-9997, CVE-2019-11521
SHA-256 | ea4821effec5ebd51f45bdf732d362fc22eb10a99a7363c2441cceeedc97dfae
Johnny You Are Fired
Posted May 1, 2019
Authored by Juraj Somorovsky, Jorg Schwenk, Sebastian Schinzel, Damian Poddebniak, Hanno Bock, Jens Muller, Marcus Brinkmann

This archive contains proof of concepts and a whitepaper that describes multiple email client implementations where popular clients for email are vulnerable to signature spoofing attacks.

tags | exploit, paper, spoof, proof of concept
advisories | CVE-2017-17848, CVE-2018-12019, CVE-2018-12020, CVE-2018-12356, CVE-2018-12556, CVE-2018-15586, CVE-2018-15587, CVE-2018-15588, CVE-2018-18509, CVE-2019-8338
SHA-256 | 3356c7f94ef68ddc7268602c64a93e10fbaff874992374b51f89d7cf87f71a0c
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