Consequently, if we execute “sudoedit -s”, then we set both MODE_EDIT and MODE_SHELL (but not MODE_RUN), we avoid the escape code, reach the vulnerable code, and overflow the heap-based buffer “user_args” through a command-line argument that ends with a ...
Bugs in dynamic memory management, including for instance heap-based buffer overflows and dangling pointers, are an important source of vulnerabilities in C and C++. Overwriting the management information of the memory allocation library is often a source of attack on these vulnerabilities. All ...
CVE-2023-27997 is a heap-based buffer overflow vulnerability in the secure socket layer virtual private network (SSL VPN) functionality in FortiOS and FortiProxy in Fortinet devices including its FortiGate Next Generation Firewalls (NGFW). An unauthenticated, remote attacker could ...
The heap buffer overflow gives us the ability to conduct a fastbin dup attack. “Fastbin dup” is a type of attack that corrupts the state of the heap so that a subsequent call tomallocreturns a chosen address. Oncemallochas returned a chosen address, we can write arbitrary data to that ...
PSIRT Blogs Analysis of FG-IR-22-398 – FortiOS - heap-based buffer overflow in SSLVPNdBy Carl Windsor, Guillaume Lovet, Hongkei Chan, and Alex Kong | January 11, 2023 Affected Platforms: FortiOS Impacted Users: Government & large organizations Impact: Data loss and OS and...
堆栈溢出 ( Stack overflow)攻击是当前攻击计算机的一种常用手段 。 2. Aiming at the deficiency of common method StackGuard which avoids stack overflow by improving compiler we putforword a new method of anti-stack overflow based on random technology and StackShield method,which another improving comp...
A heap-based buffer overflow vulnerability in the processing of Link Control Protocol messages in FortiGate versions 5.6.12, 6.0.10, 6.2.4 and 6.4.1 and earlier may allow a remote attacker with valid SSL VPN credentials to crash the SSL VPN daemon by sending a large LCP packet, when tunnel...
will compare whether they match. The type mismatch is considered as overflow. Then the real boundaries of objects will be calculated based on the pointer addresses and the size of the operations. Heap overflow occurs when the writes are out-of-bounds. Then the over-written regions are carefull...
If you are unfamiliar with heap based buffer overflows, at least at a basic level, then it is suggested that you focus in this area first. To follow along you will need: - Windows XP with just SP1 installed. - Windows XP with just SP2/SP3 installed. - A debugger (Olly Debugger, Imm...
Web browsers that support a safe language such as Javascript are becoming a platform of great interest for security attacks. One such attack is a heap-spraying attack: a new kind of attack that combines the notoriously hard to reliably exploit heap-based