Jens Müller @jensvoid
Hack the Planet! On a #yolo trip around the word during a pandemic. Involved in https://t.co/UATbdfU5vH, #efail, #pdfex. Raw tech. No chit-chat. nds.rub.de/chair/people/j… Planet Earth Joined March 2013-
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Followers1K
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Following219
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Likes210
Lol. @HackenProof a reputable bug bounty platform sends out invites for their program to attack Russian critical infrastructure (SCADA, banks, energy). Crazy times & Happy hunting. #StandingWithUkraine hackenproof.com/ukraine-will-w…
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Jens Müller retweeted
Angreifer könnten digitale Unterschrift in LibreOffice und OpenOffice fälschen heise.de/news/Angreifer… #LibreOffice #OpenOffice
If you build #Ghostscript from source, apply this patch to counter the latest RCE (now known as CVE-2021-3781): git.ghostscript.com/?p=ghostpdl.gi…
0day RCE in #Ghostscript going wild. This issue was found independently by @emil_lerner and @jensvoid. Fun fact: GS is everywhere. Even LESS(1) is affected.
@RDerenzy @emil_lerner ImageMagick is *not* required (but can be used as a vector to call Ghostscript). The 9.50 to 9.54 releases are vulnerable. I don't use Windows.
@1AKDJ @emil_lerner Kali Rolling (less 551); likes to convert all kinds of obscure file types to plain text before displaying to the user; thereby increasing the attack surface
Jens Müller retweeted
@lambdafu & @jurajsomorovsky evaluate the real-world attack surface of web browsers and widely-deployed email and FTP servers in lab experiments and with internet-wide scans in this #BHUSA Briefing informatech.co/3cy70QQ
@mniemietz @HGI_Bochum @HSNiederrhein Congrats Marcus, and thanks for shepherding me into @HGI_Bochum back in the days!
Jens Müller retweeted
We found another flaw in the design of TLS! If you have servers that share certificates across services you might want to take a look at this: alpaca-attack.com. 🧵👇
Jens Müller retweeted
New paper: "ALPACA: Application Layer Protocol Confusion -Analyzing and Mitigating Cracks in TLS Authentication" to be presented @USENIXSecurity '21. Joint work with @lambdafu @dr4ys3n @ic0nz1 @dues__ @jensvoid @jurajsomorovsky @JoergSchwenk. 1/
"PhD Defense" can finally be crossed off that to-do list. So long @HGI_Bochum, and thanks for all the fish!
@nitro_sam @Klose7 Please read your emails to [email protected] (RCE in Nitro Reader/Pro; never got an answer)
Jens Müller retweeted
New paper on how to fix #efail style attacks against e2e encrypted email, including OpenPGP and S/MIME. Joint work with @JoergSchwenk @lambdafu @dues__ @jensvoid @jurajsomorovsky @seecurity. To be presented at @acm_ccs 2020. Thread:
Jens Müller retweeted
Datenklau über Mailto-Links heise.de/news/Datenklau… #Datenklau #EMail
My fault. Even though Thunderbird removed the mailto:?attach feature, it still seems present in distros that apply xdg-email to parse mailto URLs. Thanks to @j_o_n__w and @Ug_0Security for all the debugging :). Original report for Thunderbird now public: bugzilla.mozilla.org/show_bug.cgi?i…
Have you ever heard of the mailto:?attach=~/… parameter? It allows to include arbitrary files on disk. So, why break PGP if you can politely ask the victim's mail client to include the private key? (1/4)
@j_o_n__w @Ug_0Security Sry, the line is "ATTACH=$(/bin/echo -e $(echo "$MAILTO" | grep '^attach='..." in the run_thunderbird() function of xdg-email. Thanks.
@j_o_n__w @Ug_0Security Can you confirm that you are using xdg-email (e.g., by commenting out line 51 in /usr/bin/xdg-email and then testing if it still works)?
@j_o_n__w @Ug_0Security This is bad. It had been fixed in/by TB in the past. But imho xdg-email re-opens the attack surface: gitlab.freedesktop.org/xdg/xdg-utils/…
Jens Müller retweeted
E-Mail: Gefährliche Mailto-Links können Daten stehlen #mailto glm.io/150326?t
Jens Müller retweeted
@JamesHenstridge @jensvoid Yes. See me other answer, for some reason this escaped KDE Security Team radar and i thought it had not been reported to KDE while it had indeed been.
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