Uploaded December 2021 | Updated September 2026, 2 weeks ago
In this video we dig a layer deeper into Log4j. We get a quick overview how Log4j is parsing lookup strings and find the functions used in WAF bypasses. Then we bridge the gap to format string vulnerabilities and figure out why the noLookups mitigation has flaws.
LEARN ON HEXTREE (ad)
Learn hacking on Hextree: hextree.io
Watch this video and more on Hextree: app.hextree.io/courses/yt-0day/java-hacking
Join the Hextree Discord: discord.gg/xgQpCQCpvy
Part 1 - Hackers vs. Developers // CVE-2021-44228 Log4Shell: youtube.com/watch?v=w2F67LbEtnk
My lamest GitHub repo ever: github.com/LiveOverflow/log4shell
--
CHAPTERS
00:00 - Intro
00:38 - Chapter #1: Log4j Lookups in Depth Debugging
03:50 - Log Layout Formatters
06:56 - Chapter #2: Secure Software Design
09:21 - Chapter #3: Format String Vulnerabilities
13:58 - Chapter #4: noLookups Mitigation
15:15 - Final Worlds
15:42 - Outro
SUPPORT
Per video: patreon.com/join/liveoverflow
Per month: youtube.com/channel/UClcE-kVhqyiHCcjYwcpfj9w/join
Buy my handwriting font (ad): shop.liveoverflow.com
WATCH, FOLLOW & READ
Second channel: youtube.com/LiveUnderflow
Twitch: twitch.tv/LiveOverflow
Twitter: twitter.com/LiveOverflow
Instagram: instagram.com/LiveOverflow
TikTok: tiktok.com/@liveoverflow_
LiveOverflow blog: liveoverflow.com
Hextree blog (ad): hextree.io/blog
#GameHacking #SecurityResearch #LiveOverflow
(ad) LiveOverflow YouTube channel is supported by advertisement and product placement.
In this video we dig a layer deeper into Log4j. We get a quick overview how Log4j is parsing lookup strings and find the functions used in WAF bypasses. Then we bridge the gap to format string vulnerabilities and figure out why the noLookups mitigation has flaws.
LEARN ON HEXTREE (ad)
Learn hacking on Hextree: hextree.io
Watch this video and more on Hextree: app.hextree.io/courses/yt-0day/java-hacking
Join the Hextree Discord: discord.gg/xgQpCQCpvy
Part 1 - Hackers vs. Developers // CVE-2021-44228 Log4Shell: youtube.com/watch?v=w2F67LbEtnk
My lamest GitHub repo ever: github.com/LiveOverflow/log4shell
--
CHAPTERS
00:00 - Intro
00:38 - Chapter #1: Log4j Lookups in Depth Debugging
03:50 - Log Layout Formatters
06:56 - Chapter #2: Secure Software Design
09:21 - Chapter #3: Format String Vulnerabilities
13:58 - Chapter #4: noLookups Mitigation
15:15 - Final Worlds
15:42 - Outro
SUPPORT
Per video: patreon.com/join/liveoverflow
Per month: youtube.com/channel/UClcE-kVhqyiHCcjYwcpfj9w/join
Buy my handwriting font (ad): shop.liveoverflow.com
WATCH, FOLLOW & READ
Second channel: youtube.com/LiveUnderflow
Twitch: twitch.tv/LiveOverflow
Twitter: twitter.com/LiveOverflow
Instagram: instagram.com/LiveOverflow
TikTok: tiktok.com/@liveoverflow_
LiveOverflow blog: liveoverflow.com
Hextree blog (ad): hextree.io/blog
#GameHacking #SecurityResearch #LiveOverflow
(ad) LiveOverflow YouTube channel is supported by advertisement and product placement.
