Java - Custom gadget deserialization

50 Points

Hey inspector, will you find the gadget?

Author

Elweth, 28 December 2023

Level

Validations

442 Challengers 1%

Note

41 Votes

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Solution

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Challenge Results

Pseudo	Challenge	Lang	Date
pulsar	Java - Custom gadget deserialisation		4 September 2026 at 13:13
Apto	Java - Custom gadget deserialisation		27 August 2026 at 22:31
Otto38dd	Java - Custom gadget deserialization		26 August 2026 at 14:43
Zélétix	Java - Custom gadget deserialisation		24 August 2026 at 11:11
hugo972	Java - Custom gadget deserialisation		22 August 2026 at 20:53
zero_finder	Java - Custom gadget deserialisation		16 August 2026 at 21:21
hugore	Java - Custom gadget deserialisation		16 August 2026 at 10:24
couttcoutt	Java - Custom gadget deserialisation		13 August 2026 at 00:40
rootcat	Java - Custom gadget deserialisation		12 August 2026 at 16:51
X-OR	Java - Custom gadget deserialisation		9 August 2026 at 14:56

97 Challenges

Results	Name	Validations	Number of points	Difficulty	Author	Note	Solution	Date
	HTML - Source code	47% 188213	5		g0uZ		6	3 October 2006
	HTTP - IP restriction bypass	10% 37723	10		Cyrhades		8	23 March 2021
	HTTP - Open redirect	19% 74425	10		Swissky		10	2 August 2017
	HTTP - User-agent	24% 93111	10		g0uZ		10	3 October 2006
	Weak password	30% 120409	10		g0uZ		7	3 October 2006
	PHP - Command injection	19% 74950	10		sambecks		10	20 September 2017
	API - Broken Access	3% 9366	15		Nishacid , Mika		4	18 January 2024
	Backup file	15% 58998	15		g0uZ		10	27 February 2011
	HTTP - Directory indexing	22% 84506	15		g0uZ		7	7 October 2006
	HTTP - Headers	15% 60253	15		Arod		9	11 January 2015
	HTTP - POST	14% 55319	15		Th1b4ud		10	14 August 2018
	HTTP - Improper redirect	12% 46770	15		Arod		10	26 November 2014
	HTTP - Verb tampering	13% 50678	15		g0uZ		10	3 February 2011
	Install files	12% 47671	15		g0uZ		7	7 October 2006
	Nginx - Alias Misconfiguration	2% 5668	15		.Yo0x		3	27 September 2024
	Nginx - Root Location Misconfiguration	2% 4111	15		.Yo0x		2	27 September 2024
	API - Mass Assignment	2% 5411	20		Nishacid , Mika		2	18 January 2024
	CRLF	9% 34208	20		g0uZ		7	31 July 2011
	File upload - Double extensions	10% 38360	20		g0uZ		10	24 December 2012
	File upload - MIME type	8% 30990	20		g0uZ		10	26 December 2012
	Flask - Unsecure session	2% 4436	20		Sanlokii		1	29 November 2023
	GraphQL - Introspection	2% 5375	20		apges01		4	19 January 2023
	HTTP - Cookies	13% 49997	20		g0uZ		8	7 October 2006
	Insecure Code Management	4% 15622	20		Swissky		6	29 September 2019
	JWT - Introduction	6% 20255	20		Kn0wledge		5	21 August 2019
	XSS - Server Side	2% 4355	20		Elf		4	23 June 2023
	Directory traversal	10% 38831	25		g0uZ		3	31 July 2011
	File upload - Null byte	7% 26299	25		g0uZ		4	26 December 2012
	JWT - Revoked token	2% 7659	25		ArnC		6	20 March 2020
	JWT - Weak secret	4% 14127	25		Jrmbt		8	21 August 2019
	JWT - Unsecure File Signature	1% 3514	25		Nishacid , Mika		3	23 February 2023
	PHP - assert()	5% 17128	25		Birdy42		10	26 November 2016
	PHP - Apache configuration	1% 3382	25		erk3 , nemoz		4	8 July 2022
	PHP - Filters	6% 21488	25		g0uZ		3	27 February 2011
	PHP - register globals	5% 17264	25		g0uZ		2	8 October 2011
	PHP - Remote Xdebug	1% 1799	25		mayfly		4	18 March 2020
	Python - Server-side Template Injection Introduction	2% 5993	25		Podalirius		7	7 September 2021
	File upload - ZIP	3% 10949	30		ghozt		3	3 August 2017
	Flask - Development server	1% 1670	30		Sanlokii		1	29 November 2023
	GraphQL - Injection	1% 1380	30		apges01		2	19 January 2023
	Command injection - Filter bypass	3% 8848	30		sambecks		6	20 September 2017
	Java - Server-side Template Injection	3% 11984	30		righettod		6	29 November 2015
	JWT - Public key	2% 4780	30		Jrmbt		5	21 August 2019
	JWT - Header Injection	1% 1927	30		Nishacid , Mika		2	23 February 2023
	Local File Inclusion	7% 27977	30		g0uZ		4	2 October 2011
	Local File Inclusion - Double encoding	4% 14238	30		zM_		4	13 June 2016
	Nginx - SSRF Misconfiguration	1% 1122	30		.Yo0x		1	27 September 2024
	Node - Eval	1% 3619	30		Mhd_Root		8	24 February 2021
	PHP - Loose Comparison	3% 8123	30		ghozt		4	10 January 2018
	PHP - preg_replace()	3% 9912	30		sambecks		4	2 March 2016
	PHP - type juggling	3% 9709	30		vic		4	10 March 2016
	Remote File Inclusion	4% 13020	30		g0uZ		8	25 November 2015
	Ruby on Rails - ransack	1% 392	30		koma		0	23 June 2025
	SQL injection - Authentication	13% 51175	30		g0uZ		11	27 February 2011
	SQL injection - Authentication - GBK	3% 11140	30		dvor4x		4	2 December 2015
	SQL injection - String	7% 24444	30		g0uZ		10	24 December 2012
	XSLT - Code execution	2% 4227	30		ghozt		5	16 July 2017
	Elixir - EEx	1% 638	35		lolo42		1	29 November 2023
	JWT - Unsecure Key Handling	1% 1264	35		Nishacid , Mika		5	23 February 2023
	LDAP injection - Authentication	3% 11350	35		g0uZ		8	26 May 2013
	Node - Serialize	1% 1654	35		Mhd_Root		2	24 February 2021
	NoSQL injection - Authentication	3% 8604	35		mastho		8	31 May 2015
	PHP - Path Truncation	2% 5960	35		Geluchat		7	25 March 2015
	PHP - Serialization	2% 7438	35		Arod		3	3 February 2014
	SQL injection - Numeric	5% 16953	35		g0uZ		7	24 December 2012
	SQL Injection - Routed	2% 6159	35		soka		5	24 December 2016
	SQL Truncation	2% 7674	35		Geluchat		2	1 May 2015
	XML External Entity	2% 6355	35		sambecks		2	20 October 2014
	XPath injection - Authentication	2% 7244	35		g0uZ		6	27 December 2012
	Yaml - Deserialization	1% 1777	35		Nishacid		2	20 April 2021
	API - Broken Access 2	1% 1059	40		Nishacid , Mika		1	18 January 2024
	GraphQL - Backend injection	1% 732	40		apges01		1	19 January 2023
	GraphQL - Mutation	1% 1892	40		CanardMandarin		2	20 October 2020
	Java - Spring Boot	1% 2611	40		dvor4x		3	24 December 2016
	Local File Inclusion - Wrappers	2% 4204	40		sambecks		4	2 March 2016
	PHP - Eval	2% 4224	40		chmod		10	8 November 2018
	PHP - Eval - Advanced filters bypass	1% 862	40		Podalirius		2	8 July 2022
	SQL injection - Error	3% 9185	40		sambecks		5	4 March 2015
	SQL injection - Insert	1% 3614	40		sambecks		4	23 February 2015
	SQL injection - File reading	2% 6745	40		Arod		3	19 October 2014
	XPath injection - String	2% 4292	40		g0uZ		5	26 May 2013
	File upload - Polyglot	1% 819	45		Cyxo		1	8 July 2022
	NodeJS - Prototype Pollution Bypass	1% 713	45		Worty		1	22 October 2021
	NoSQL injection - Blind	1% 3508	45		ghozt		6	26 November 2016
	SQL injection - Time based	2% 6510	45		ycam		4	11 September 2015
	Java - Custom gadget deserialization	1% 442	50		Elweth		0	28 December 2023
	NodeJS - vm escape	1% 967	50		Podalirius		2	15 April 2021
	Server Side Request Forgery	1% 2172	50		sambecks		7	22 June 2018
	SQL injection - Blind	3% 8663	50		g0uZ		6	27 February 2011
	LDAP injection - Blind	1% 3857	55		g0uZ		2	8 June 2013
	PHP - Unserialize overflow	1% 969	55		mayfly		2	4 April 2020
	PHP - Unserialize Pop Chain	1% 991	55		Worty		2	22 October 2021
	SQL Injection - Second Order	1% 439	55		k4ndar3c		1	29 November 2023
	Python - dotenv	1% 317	70		jrjgjk		1	27 September 2024
	Python - Blind SSTI Filters Bypass	1% 956	75		Podalirius		5	7 September 2021
	XPath injection - Blind	1% 2718	75		g0uZ		5	27 December 2012
	SQL injection - Filter bypass	1% 3599	80		sambecks		7	21 July 2014