Java - Custom gadget deserialization

50 Points

Hey inspector, will you find the gadget?

Author

Elweth, 28 December 2023

Level

Validations

314 Challengers 1%

Note

38 Votes

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Solution

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Challenge Results

Pseudo	Challenge	Lang	Date
Mehdi Mascret	Java - Custom gadget deserialisation		30 November 2025 at 15:19
Joan	Java - Custom gadget deserialization		28 November 2025 at 23:34
m3ringue	Java - Custom gadget deserialisation		28 November 2025 at 16:14
Math-X	Java - Custom gadget deserialisation		25 November 2025 at 22:33
0xszzaps	Java - Custom gadget deserialisation		22 November 2025 at 18:36
Trachinus	Java - Custom gadget deserialisation		20 November 2025 at 20:49
lominack	Java - Custom gadget deserialization		18 November 2025 at 14:48
kikipaul	Java - Custom gadget deserialisation		17 November 2025 at 10:22
GL4dI4T0R	Java - Custom gadget deserialisation		16 November 2025 at 22:31
AllTx	Java - Custom gadget deserialisation		14 November 2025 at 23:44

97 Challenges

Results	Name	Validations	Number of points	Difficulty	Author	Note	Solution	Date
	HTML - Source code	48% 180223	5		g0uZ		6	3 October 2006
	HTTP - IP restriction bypass	9% 33953	10		Cyrhades		8	23 March 2021
	HTTP - Open redirect	19% 71117	10		Swissky		10	2 August 2017
	HTTP - User-agent	24% 89190	10		g0uZ		10	3 October 2006
	Weak password	31% 116046	10		g0uZ		7	3 October 2006
	PHP - Command injection	19% 71254	10		sambecks		10	20 September 2017
	API - Broken Access	2% 7182	15		Nishacid , Mika		4	18 January 2024
	Backup file	15% 56892	15		g0uZ		10	27 February 2011
	HTTP - Directory indexing	22% 81555	15		g0uZ		7	7 October 2006
	HTTP - Headers	16% 57812	15		Arod		9	11 January 2015
	HTTP - POST	14% 52900	15		Th1b4ud		10	14 August 2018
	HTTP - Improper redirect	12% 44960	15		Arod		10	26 November 2014
	HTTP - Verb tampering	13% 48782	15		g0uZ		10	3 February 2011
	Install files	13% 46006	15		g0uZ		7	7 October 2006
	Nginx - Alias Misconfiguration	2% 4127	15		.Yo0x		3	27 September 2024
	Nginx - Root Location Misconfiguration	1% 2552	15		.Yo0x		1	27 September 2024
	API - Mass Assignment	2% 4240	20		Nishacid , Mika		2	18 January 2024
	CRLF	9% 33142	20		g0uZ		7	31 July 2011
	File upload - Double extensions	10% 36890	20		g0uZ		10	24 December 2012
	File upload - MIME type	8% 29782	20		g0uZ		10	26 December 2012
	Flask - Unsecure session	1% 3636	20		Sanlokii		1	29 November 2023
	GraphQL - Introspection	2% 4649	20		apges01		4	19 January 2023
	HTTP - Cookies	13% 48134	20		g0uZ		8	7 October 2006
	Insecure Code Management	4% 14838	20		Swissky		6	29 September 2019
	JWT - Introduction	6% 19033	20		Kn0wledge		5	21 August 2019
	XSS - Server Side	1% 3586	20		Elf		4	23 June 2023
	Directory traversal	10% 37295	25		g0uZ		3	31 July 2011
	File upload - Null byte	7% 25342	25		g0uZ		4	26 December 2012
	JWT - Revoked token	2% 6977	25		ArnC		6	20 March 2020
	JWT - Weak secret	4% 13216	25		Jrmbt		8	21 August 2019
	JWT - Unsecure File Signature	1% 2940	25		Nishacid , Mika		3	23 February 2023
	PHP - assert()	5% 16409	25		Birdy42		10	26 November 2016
	PHP - Apache configuration	1% 2944	25		erk3 , nemoz		4	8 July 2022
	PHP - Filters	6% 20773	25		g0uZ		3	27 February 2011
	PHP - register globals	5% 16697	25		g0uZ		2	8 October 2011
	PHP - Remote Xdebug	1% 1634	25		mayfly		4	18 March 2020
	Python - Server-side Template Injection Introduction	2% 5390	25		Podalirius		7	7 September 2021
	File upload - ZIP	3% 10364	30		ghozt		3	3 August 2017
	Flask - Development server	1% 1364	30		Sanlokii		1	29 November 2023
	GraphQL - Injection	1% 1063	30		apges01		2	19 January 2023
	Command injection - Filter bypass	3% 8263	30		sambecks		6	20 September 2017
	Java - Server-side Template Injection	4% 11455	30		righettod		6	29 November 2015
	JWT - Public key	2% 4350	30		Jrmbt		5	21 August 2019
	JWT - Header Injection	1% 1611	30		Nishacid , Mika		2	23 February 2023
	Local File Inclusion	8% 26959	30		g0uZ		4	2 October 2011
	Local File Inclusion - Double encoding	4% 13683	30		zM_		4	13 June 2016
	Nginx - SSRF Misconfiguration	1% 654	30		.Yo0x		1	27 September 2024
	Node - Eval	1% 3298	30		Mhd_Root		8	24 February 2021
	PHP - Loose Comparison	3% 7745	30		ghozt		4	10 January 2018
	PHP - preg_replace()	3% 9553	30		sambecks		4	2 March 2016
	PHP - type juggling	3% 9339	30		vic		4	10 March 2016
	Remote File Inclusion	4% 12500	30		g0uZ		8	25 November 2015
	Ruby on Rails - ransack	1% 72	30		koma		0	23 June 2025
	SQL injection - Authentication	13% 48804	30		g0uZ		11	27 February 2011
	SQL injection - Authentication - GBK	3% 10560	30		dvor4x		4	2 December 2015
	SQL injection - String	7% 23295	30		g0uZ		10	24 December 2012
	XSLT - Code execution	2% 4005	30		ghozt		5	16 July 2017
	Elixir - EEx	1% 458	35		lolo42		1	29 November 2023
	JWT - Unsecure Key Handling	1% 1061	35		Nishacid , Mika		5	23 February 2023
	LDAP injection - Authentication	3% 10946	35		g0uZ		8	26 May 2013
	Node - Serialize	1% 1485	35		Mhd_Root		2	24 February 2021
	NoSQL injection - Authentication	3% 8190	35		mastho		8	31 May 2015
	PHP - Path Truncation	2% 5738	35		Geluchat		7	25 March 2015
	PHP - Serialization	2% 7146	35		Arod		3	3 February 2014
	SQL injection - Numeric	5% 16131	35		g0uZ		7	24 December 2012
	SQL Injection - Routed	2% 5831	35		soka		5	24 December 2016
	SQL Truncation	2% 7263	35		Geluchat		2	1 May 2015
	XML External Entity	2% 6007	35		sambecks		2	20 October 2014
	XPath injection - Authentication	2% 6979	35		g0uZ		6	27 December 2012
	Yaml - Deserialization	1% 1614	35		Nishacid		2	20 April 2021
	API - Broken Access 2	1% 758	40		Nishacid , Mika		1	18 January 2024
	GraphQL - Backend injection	1% 562	40		apges01		1	19 January 2023
	GraphQL - Mutation	1% 1725	40		CanardMandarin		2	20 October 2020
	Java - Spring Boot	1% 2489	40		dvor4x		3	24 December 2016
	Local File Inclusion - Wrappers	2% 3974	40		sambecks		4	2 March 2016
	PHP - Eval	2% 3944	40		chmod		10	8 November 2018
	PHP - Eval - Advanced filters bypass	1% 723	40		Podalirius		2	8 July 2022
	SQL injection - Error	3% 8611	40		sambecks		5	4 March 2015
	SQL injection - Insert	1% 3391	40		sambecks		4	23 February 2015
	SQL injection - File reading	2% 6354	40		Arod		3	19 October 2014
	XPath injection - String	2% 4152	40		g0uZ		5	26 May 2013
	File upload - Polyglot	1% 593	45		Cyxo		1	8 July 2022
	NodeJS - Prototype Pollution Bypass	1% 630	45		Worty		1	22 October 2021
	NoSQL injection - Blind	1% 3288	45		ghozt		6	26 November 2016
	SQL injection - Time based	2% 6200	45		ycam		4	11 September 2015
	Java - Custom gadget deserialization	1% 314	50		Elweth		0	28 December 2023
	NodeJS - vm escape	1% 861	50		Podalirius		2	15 April 2021
	Server Side Request Forgery	1% 2064	50		sambecks		7	22 June 2018
	SQL injection - Blind	3% 8221	50		g0uZ		6	27 February 2011
	LDAP injection - Blind	1% 3674	55		g0uZ		2	8 June 2013
	PHP - Unserialize overflow	1% 853	55		mayfly		2	4 April 2020
	PHP - Unserialize Pop Chain	1% 848	55		Worty		2	22 October 2021
	SQL Injection - Second Order	1% 293	55		k4ndar3c		1	29 November 2023
	Python - dotenv	1% 176	70		jrjgjk		1	27 September 2024
	Python - Blind SSTI Filters Bypass	1% 792	75		Podalirius		5	7 September 2021
	XPath injection - Blind	1% 2530	75		g0uZ		5	27 December 2012
	SQL injection - Filter bypass	1% 3232	80		sambecks		7	21 July 2014