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Files from Clement LECIGNE

Email addressroot at clem1.be
First Active2009-08-26
Last Active2020-05-08
Microsoft Windows NtUserMNDragOver Local Privilege Escalation
Posted May 8, 2020
Authored by Clement LECIGNE, timwr, Grant Willcox | Site metasploit.com

This Metasploit module exploits a NULL pointer dereference vulnerability in MNGetpItemFromIndex(), which is reachable via a NtUserMNDragOver() system call. The NULL pointer dereference occurs because the xxxMNFindWindowFromPoint() function does not effectively check the validity of the tagPOPUPMENU objects it processes before passing them on to MNGetpItemFromIndex(), where the NULL pointer dereference will occur. This module has been tested against Windows 7 x86 SP0 and SP1. Offsets within the solution may need to be adjusted to work with other versions of Windows, such as Windows Server 2008.

tags | exploit, x86
systems | windows, 7
advisories | CVE-2019-0808
MD5 | e65eeb8c736544fe952269396a557f62
Google Chrome 80 JSCreate Side-Effect Type Confusion
Posted Mar 5, 2020
Authored by Clement LECIGNE, timwr, Istvan Kurucsai, Vignesh S Rao | Site metasploit.com

This Metasploit module exploits an issue in Google Chrome version 80.0.3987.87 (64 bit). The exploit corrupts the length of a float array (float_rel), which can then be used for out of bounds read and write on adjacent memory. The relative read and write is then used to modify a UInt64Array (uint64_aarw) which is used for read and writing from absolute memory. The exploit then uses WebAssembly in order to allocate a region of RWX memory, which is then replaced with the payload shellcode. The payload is executed within the sandboxed renderer process, so the browser must be run with the --no-sandbox option for the payload to work correctly.

tags | exploit, shellcode
advisories | CVE-2020-6418
MD5 | 2477d57f77b12b3980be7a18ed9dedf2
FreeBSD Security Advisory - FreeBSD-SA-19:22.mbuf
Posted Aug 21, 2019
Authored by Clement LECIGNE | Site security.freebsd.org

FreeBSD Security Advisory - Due do a missing check in the code of m_pulldown(9) data returned may not be contiguous as requested by the caller. Extra checks in the IPv6 code catch the error condition and trigger a kernel panic leading to a remote DoS (denial-of-service) attack with certain Ethernet interfaces. At this point it is unknown if any other than the IPv6 code paths can trigger a similar condition.

tags | advisory, remote, kernel
systems | freebsd
advisories | CVE-2019-5611
MD5 | 9c1a75e0d06084604a7f5ea3a769e9e8
Chrome 72.0.3626.119 FileReader Use-After-Free
Posted May 8, 2019
Authored by Clement LECIGNE, timwr, Istvan Kurucsai | Site metasploit.com

This exploit takes advantage of a use after free vulnerability in Google Chrome 72.0.3626.119 running on Windows 7 x86. The FileReader.readAsArrayBuffer function can return multiple references to the same ArrayBuffer object, which can be freed and overwritten with sprayed objects. The dangling ArrayBuffer reference can be used to access the sprayed objects, allowing arbitrary memory access from Javascript. This is used to write and execute shellcode in a WebAssembly object. The shellcode is executed within the Chrome sandbox, so you must explicitly disable the sandbox for the payload to be successful.

tags | exploit, arbitrary, x86, javascript, shellcode
systems | windows, 7
advisories | CVE-2019-5786
MD5 | 1845174659a656cb293c5dd2f17fe75c
FreeBSD Security Advisory - Kernel Memory Disclosure / Corruption
Posted Jan 28, 2015
Authored by Francisco Falcon, Clement LECIGNE | Site security.freebsd.org

FreeBSD Security Advisory - SCTP protocol provides reliable, flow-controlled, two-way transmission of data. It is a message oriented protocol and can support the SOCK_STREAM and SOCK_SEQPACKET abstractions. SCTP allows the user to choose between multiple scheduling algorithms to optimize the sending behavior of SCTP in scenarios with different requirements. Due to insufficient validation of the SCTP stream ID, which serves as an array index, a local unprivileged attacker can read or write 16-bits of kernel memory.

tags | advisory, kernel, local, protocol
systems | freebsd
advisories | CVE-2014-8612
MD5 | d91dfbcc12d71302de651badd86e3a5f
FreeBSD Security Advisory - IP_MSFILTER Integer Overflow
Posted Aug 23, 2013
Authored by Clement LECIGNE | Site security.freebsd.org

FreeBSD Security Advisory - An integer overflow in computing the size of a temporary buffer can result in a buffer which is too small for the requested operation. An unprivileged process can read or write pages of memory which belong to the kernel. These may lead to exposure of sensitive information or allow privilege escalation.

tags | advisory, overflow, kernel
systems | freebsd
advisories | CVE-2013-3077
MD5 | 22c046761afc564563c218783799e9d9
Linux 2.6.30 atalk_getname() Stack Disclosure
Posted Aug 26, 2009
Authored by Clement LECIGNE

Linux kernel versions 2.6.30 and below atalk_getname() 8-bytes stack disclosure exploit.

tags | exploit, kernel
systems | linux
MD5 | 89c701e39643c73bac7a1914c8977cf4
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