Java - Custom gadget deserialization

50 Points

Hey inspector, will you find the gadget?

Author

Elweth, 28 December 2023

Level

Validations

185 Challengers 1%

Note

29 Votes

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Solution

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Challenge Results

Pseudo	Challenge	Lang	Date
testtest8654	Java - Custom gadget deserialization		1 March 2025 at 13:55
haflout	Java - Custom gadget deserialization		1 March 2025 at 12:52
psmak	Java - Custom gadget deserialization		27 February 2025 at 13:22
whira	Java - Custom gadget deserialisation		22 February 2025 at 15:22
Bl00dy	Java - Custom gadget deserialisation		19 February 2025 at 11:40
Erovinmo	Java - Custom gadget deserialisation		18 February 2025 at 16:53
KOOLI	Java - Custom gadget deserialization		16 February 2025 at 12:57
tedi_v	Java - Custom gadget deserialisation		13 February 2025 at 16:51
dalifit	Java - Custom gadget deserialisation		10 February 2025 at 13:40
Nefbou123	Java - Custom gadget deserialisation		10 February 2025 at 13:27

96 Challenges

Results	Name	Validations	Number of points	Difficulty	Author	Note	Solution	Date
	HTML - Source code	48% 170388	5		g0uZ		5	3 October 2006
	HTTP - IP restriction bypass	9% 29429	10		Cyrhades		7	23 March 2021
	HTTP - Open redirect	19% 67007	10		Swissky		10	2 August 2017
	HTTP - User-agent	24% 84232	10		g0uZ		10	3 October 2006
	Weak password	32% 110279	10		g0uZ		7	3 October 2006
	PHP - Command injection	19% 66815	10		sambecks		10	20 September 2017
	API - Broken Access	2% 4638	15		Nishacid , Mika		3	18 January 2024
	Backup file	16% 54360	15		g0uZ		10	27 February 2011
	HTTP - Directory indexing	22% 77594	15		g0uZ		7	7 October 2006
	HTTP - Headers	16% 54787	15		Arod		9	11 January 2015
	HTTP - POST	14% 49675	15		Th1b4ud		10	14 August 2018
	HTTP - Improper redirect	13% 42678	15		Arod		10	26 November 2014
	HTTP - Verb tampering	14% 46415	15		g0uZ		10	3 February 2011
	Install files	13% 43865	15		g0uZ		6	7 October 2006
	Nginx - Alias Misconfiguration	1% 2193	15		.Yo0x		2	27 September 2024
	Nginx - Root Location Misconfiguration	1% 191	15		.Yo0x		0	27 September 2024
	API - Mass Assignment	1% 2921	20		Nishacid , Mika		2	18 January 2024
	CRLF	9% 31876	20		g0uZ		7	31 July 2011
	File upload - Double extensions	10% 35074	20		g0uZ		10	24 December 2012
	File upload - MIME type	8% 28142	20		g0uZ		10	26 December 2012
	Flask - Unsecure session	1% 2681	20		Sanlokii		1	29 November 2023
	GraphQL - Introspection	2% 3782	20		apges01		4	19 January 2023
	HTTP - Cookies	13% 45798	20		g0uZ		8	7 October 2006
	Insecure Code Management	4% 13853	20		Swissky		6	29 September 2019
	JWT - Introduction	5% 17419	20		Kn0wledge		5	21 August 2019
	XSS - Server Side	1% 2766	20		Elf		4	23 June 2023
	Directory traversal	10% 35404	25		g0uZ		3	31 July 2011
	File upload - Null byte	7% 24013	25		g0uZ		4	26 December 2012
	JWT - Revoked token	2% 6167	25		ArnC		6	20 March 2020
	JWT - Weak secret	4% 12086	25		Jrmbt		6	21 August 2019
	JWT - Unsecure File Signature	1% 2273	25		Nishacid , Mika		3	23 February 2023
	PHP - assert()	5% 15537	25		Birdy42		10	26 November 2016
	PHP - Apache configuration	1% 2459	25		erk3 , nemoz		4	8 July 2022
	PHP - Filters	6% 19768	25		g0uZ		3	27 February 2011
	PHP - register globals	5% 15928	25		g0uZ		2	8 October 2011
	PHP - Remote Xdebug	1% 1508	25		mayfly		4	18 March 2020
	Python - Server-side Template Injection Introduction	2% 4606	25		Podalirius		7	7 September 2021
	File upload - ZIP	3% 9647	30		ghozt		3	3 August 2017
	Flask - Development server	1% 975	30		Sanlokii		1	29 November 2023
	GraphQL - Injection	1% 800	30		apges01		2	19 January 2023
	Command injection - Filter bypass	3% 7715	30		sambecks		6	20 September 2017
	Java - Server-side Template Injection	4% 10726	30		righettod		6	29 November 2015
	JWT - Public key	2% 3914	30		Jrmbt		5	21 August 2019
	JWT - Header Injection	1% 1224	30		Nishacid , Mika		2	23 February 2023
	Local File Inclusion	8% 25707	30		g0uZ		4	2 October 2011
	Local File Inclusion - Double encoding	4% 12945	30		zM_		4	13 June 2016
	Nginx - SSRF Misconfiguration	1% 74	30		.Yo0x		0	27 September 2024
	Node - Eval	1% 2981	30		Mhd_Root		7	24 February 2021
	PHP - Loose Comparison	3% 7330	30		ghozt		4	10 January 2018
	PHP - preg_replace()	3% 9114	30		sambecks		4	2 March 2016
	PHP - type juggling	3% 8927	30		vic		4	10 March 2016
	Remote File Inclusion	4% 11890	30		g0uZ		8	25 November 2015
	SQL injection - Authentication	14% 46306	30		g0uZ		11	27 February 2011
	SQL injection - Authentication - GBK	3% 9903	30		dvor4x		4	2 December 2015
	SQL injection - String	7% 22034	30		g0uZ		10	24 December 2012
	XSLT - Code execution	2% 3755	30		ghozt		5	16 July 2017
	Elixir - EEx	1% 282	35		lolo42		1	29 November 2023
	JWT - Unsecure Key Handling	1% 798	35		Nishacid , Mika		5	23 February 2023
	LDAP injection - Authentication	3% 10437	35		g0uZ		8	26 May 2013
	Node - Serialize	1% 1307	35		Mhd_Root		2	24 February 2021
	NoSQL injection - Authentication	3% 7747	35		mastho		8	31 May 2015
	PHP - Path Truncation	2% 5484	35		Geluchat		6	25 March 2015
	PHP - Serialization	2% 6783	35		Arod		3	3 February 2014
	SQL injection - Numeric	5% 15193	35		g0uZ		7	24 December 2012
	SQL Injection - Routed	2% 5463	35		soka		5	24 December 2016
	SQL Truncation	2% 6819	35		Geluchat		2	1 May 2015
	XML External Entity	2% 5681	35		sambecks		2	20 October 2014
	XPath injection - Authentication	2% 6669	35		g0uZ		6	27 December 2012
	Yaml - Deserialization	1% 1426	35		Nishacid		2	20 April 2021
	API - Broken Access 2	1% 491	40		Nishacid , Mika		1	18 January 2024
	GraphQL - Backend injection	1% 447	40		apges01		1	19 January 2023
	GraphQL - Mutation	1% 1593	40		CanardMandarin		2	20 October 2020
	Java - Spring Boot	1% 2361	40		dvor4x		3	24 December 2016
	Local File Inclusion - Wrappers	2% 3683	40		sambecks		4	2 March 2016
	PHP - Eval	2% 3670	40		chmod		10	8 November 2018
	PHP - Eval - Advanced filters bypass	1% 614	40		Podalirius		2	8 July 2022
	SQL injection - Error	3% 7940	40		sambecks		5	4 March 2015
	SQL injection - Insert	1% 3217	40		sambecks		4	23 February 2015
	SQL injection - File reading	2% 6027	40		Arod		3	19 October 2014
	XPath injection - String	2% 3969	40		g0uZ		5	26 May 2013
	File upload - Polyglot	1% 468	45		Cyxo		1	8 July 2022
	NodeJS - Prototype Pollution Bypass	1% 552	45		Worty		1	22 October 2021
	NoSQL injection - Blind	1% 3055	45		ghozt		6	26 November 2016
	SQL injection - Time based	2% 5855	45		ycam		4	11 September 2015
	Java - Custom gadget deserialization	1% 185	50		Elweth		0	28 December 2023
	NodeJS - vm escape	1% 768	50		Podalirius		1	15 April 2021
	Server Side Request Forgery	1% 1927	50		sambecks		7	22 June 2018
	SQL injection - Blind	3% 7754	50		g0uZ		6	27 February 2011
	LDAP injection - Blind	1% 3492	55		g0uZ		2	8 June 2013
	PHP - Unserialize overflow	1% 788	55		mayfly		2	4 April 2020
	PHP - Unserialize Pop Chain	1% 709	55		Worty		2	22 October 2021
	SQL Injection - Second Order	1% 222	55		k4ndar3c		1	29 November 2023
	Python - dotenv	1% 29	70		jrjgjk		0	27 September 2024
	Python - Blind SSTI Filters Bypass	1% 680	75		Podalirius		5	7 September 2021
	XPath injection - Blind	1% 2373	75		g0uZ		5	27 December 2012
	SQL injection - Filter bypass	1% 2939	80		sambecks		7	21 July 2014