Weakness (CWE)
CWE-787: Out-of-bounds Write
The product writes data past the end, or before the beginning, of the intended buffer.
How to prevent it (7 mitigations)
-
Requirements
Use a language that does not allow this weakness to occur or provides constructs that make this weakness easier to avoid.
For example, many languages that perform their own memory management, such as Java and Perl, are not subject to buffer overflows. Other languages, such as Ada and C#, typically provide overflow protection, but the protection can be disabled by the programmer.
Be wary that a language's interface to native code may still be subject to overflows, even if the language itself is theoretically safe.
-
Architecture and Design
Use a vetted library or framework that does not allow this weakness to occur or provides constructs that make this weakness easier to avoid.
Examples include the Safe C String Library (SafeStr) by Messier and Viega [REF-57], and the Strsafe.h library from Microsoft [REF-56]. These libraries provide safer versions of overflow-prone string-handling functions.
-
Operation, Build and Compilation
Use automatic buffer overflow detection mechanisms that are offered by certain compilers or compiler extensions. Examples include: the Microsoft Visual Studio /GS flag, Fedora/Red Hat FORTIFY_SOURCE GCC flag, StackGuard, and ProPolice, which provide various mechanisms including canary-based detection and range/index checking.
D3-SFCV (Stack Frame Canary Validation) from D3FEND [REF-1334] discusses canary-based detection in detail.
-
Implementation
Consider adhering to the following rules when allocating and managing an application's memory:
- Double check that the buffer is as large as specified.
- When using functions that accept a number of bytes to copy, such as strncpy(), be aware that if the destination buffer size is equal to the source buffer size, it may not NULL-terminate the string.
- Check buffer boundaries if accessing the buffer in a loop and make sure there is no danger of writing past the allocated space.
- If necessary, truncate all input strings to a reasonable length before passing them to the copy and concatenation functions.
-
Operation, Build and Compilation
Run or compile the software using features or extensions that randomly arrange the positions of a program's executable and libraries in memory. Because this makes the addresses unpredictable, it can prevent an attacker from reliably jumping to exploitable code.
Examples include Address Space Layout Randomization (ASLR) [REF-58] [REF-60] and Position-Independent Executables (PIE) [REF-64]. Imported modules may be similarly realigned if their default memory addresses conflict with other modules, in a process known as "rebasing" (for Windows) and "prelinking" (for Linux) [REF-1332] using randomly generated addresses. ASLR for libraries cannot be used in conjunction with prelink since it would require relocating the libraries at run-time, defeating the whole purpose of prelinking.
For more information on these techniques see D3-SAOR (Segment Address Offset Randomization) from D3FEND [REF-1335].
-
Operation
Use a CPU and operating system that offers Data Execution Protection (using hardware NX or XD bits) or the equivalent techniques that simulate this feature in software, such as PaX [REF-60] [REF-61]. These techniques ensure that any instruction executed is exclusively at a memory address that is part of the code segment.
For more information on these techniques see D3-PSEP (Process Segment Execution Prevention) from D3FEND [REF-1336].
-
Implementation
Replace unbounded copy functions with analogous functions that support length arguments, such as strcpy with strncpy. Create these if they are not available.
Source: MITRE CWE-787
6,190 results · Feed
-
Critical 9.8
Tenda W20E router V15.11.0.6 (US_W20EV4.0br_V15.11.0.6(1068_1546_841)_CN_TDC) contains a stack overflow vulnerability i…
-
Critical 9.8
Tenda W20E router V15.11.0.6 (US_W20EV4.0br_V15.11.0.6(1068_1546_841)_CN_TDC) contains a stack overflow vulnerability i…
-
Critical 9.8
Tenda AC18 router contained a stack overflow vulnerability in /goform/fast_setting_wifi_set
-
Critical 9.8
Tenda AC15 V15.03.05.19 contained a stack overflow via the function fromAddressNat.
-
Critical 9.8
Tenda AC15 router V15.03.05.19 contains a stack overflow via the list parameter at /goform/fast_setting_wifi_set
-
Critical 9.8
Tenda AC15 router V15.03.05.19 contains a stack overflow vulnerability in the function formSetQosBand->FUN_0007dd20 wit…
-
Critical 9.8
Tenda AC15 and AC18 router V15.03.05.19 contains stack overflow vulnerability in the function fromNatStaticSetting with…
-
Critical 9.8
Tenda AC15 and AC18 routers V15.03.05.19 contain stack overflow vulnerabilities in the function setSmartPowerManagement…
-
Critical 9.8
Tenda AC15 and AC18 routers V15.03.05.19 contain heap overflow vulnerabilities in the function setSchedWifi with the re…
-
Critical 9.8
Tenda AC15 and AC18 routers V15.03.05.19 contain stack overflow vulnerabilities in the function fromDhcpListClient with…
-
Critical 9.8
Netgear Nighthawk AC1900 Smart WiFi Dual Band Gigabit Router R7000-V1.0.11.134_10.2.119 is vulnerable to Buffer Overflo…
-
High 7.8
There is a stack buffer overflow vulnerability, which could lead to arbitrary code execution in UEFI DXE driver on some…
-
Critical 9.8
Netgear N300 wireless router wnr2000v4-V1.0.0.70 was discovered to contain a stack overflow via strcpy in uhttpd.
-
High 7.8
Netgear Nighthawk AC1900 Smart WiFi Dual Band Gigabit Router R7000-V1.0.11.134_10.2.119 is vulnerable to Buffer Overflo…
-
Medium 6.5
OTFCC commit 617837b was discovered to contain a heap buffer overflow via /release-x64/otfccdump+0x6e20a0.
-
Medium 6.5
OTFCC commit 617837b was discovered to contain a heap buffer overflow via /release-x64/otfccdump+0x6b064d.
-
Medium 6.5
OTFCC commit 617837b was discovered to contain a heap buffer overflow via /release-x64/otfccdump+0x6adb1e.
-
Medium 6.5
OTFCC commit 617837b was discovered to contain a heap buffer overflow via /release-x64/otfccdump+0x6e1fc8.
-
Medium 6.5
OTFCC commit 617837b was discovered to contain a heap buffer overflow via /release-x64/otfccdump+0x6b559f.
-
Medium 6.5
OTFCC commit 617837b was discovered to contain a heap buffer overflow via /release-x64/otfccdump+0x6e7e3d.
-
Medium 6.5
OTFCC commit 617837b was discovered to contain a segmentation violation via /release-x64/otfccdump+0x703969.
-
Medium 6.5
OTFCC commit 617837b was discovered to contain a segmentation violation via /release-x64/otfccdump+0x4fe954.
-
Medium 6.5
OTFCC commit 617837b was discovered to contain a segmentation violation via /release-x64/otfccdump+0x6babea.
-
Medium 6.5
OTFCC commit 617837b was discovered to contain a segmentation violation via /release-x64/otfccdump+0x4fbbb6.
-
Medium 6.5
OTFCC commit 617837b was discovered to contain a segmentation violation via /release-x64/otfccdump+0x4fe9a7.
-
Medium 6.5
OTFCC commit 617837b was discovered to contain a segmentation violation via /release-x64/otfccdump+0x4fbc0b.
-
Medium 6.5
OTFCC commit 617837b was discovered to contain a segmentation violation via /release-x64/otfccdump+0x5266a8.
-
Medium 6.5
OTFCC commit 617837b was discovered to contain a segmentation violation via /lib/x86_64-linux-gnu/libc.so.6+0xbb384.
-
Medium 6.5
OTFCC commit 617837b was discovered to contain a segmentation violation via /release-x64/otfccdump+0x6badae.
-
High 8.2
An issue was discovered in Insyde InsydeH2O with kernel 5.0 through 5.5. The FwBlockSericceSmm driver does not properly…
-
Critical 9.8CVE-2022-41220 Public exploit
md2roff 1.9 has a stack-based buffer overflow via a Markdown file, a different vulnerability than CVE-2022-34913. NOTE:…
-
Medium 5.5
SWFTools commit 772e55a2 was discovered to contain a segmentation violation via /multiarch/memmove-vec-unaligned-erms.S.
-
Medium 5.5
SWFTools commit 772e55a2 was discovered to contain a segmentation violation via MovieAddFrame at /src/gif2swf.c.
-
Medium 5.5
SWFTools commit 772e55a2 was discovered to contain a heap buffer-overflow via getGifDelayTime at /home/bupt/Desktop/swf…
-
Medium 5.5
SWFTools commit 772e55a2 was discovered to contain a heap-buffer overflow via __asan_memcpy at /asan/asan_interceptors_…
-
Medium 6.1
There is an out-of-bounds read and write vulnerability in some headset products. An unauthenticated attacker gets the d…
-
Critical 9.8
SWFTools commit 772e55a was discovered to contain a heap-buffer overflow via the function readU8 at /lib/ttf.c.
-
High 7.8CVE-2022-32917 Exploited
The issue was addressed with improved bounds checks. This issue is fixed in macOS Monterey 12.6, iOS 15.7 and iPadOS 15…
KEV Sep 14, 2022 -
High 8.8
A buffer overflow issue was addressed with improved memory handling. This issue is fixed in Safari 16, iOS 16, iOS 15.7…
-
High 7.8
The issue was addressed with improved memory handling. This issue is fixed in macOS Monterey 12.6, iOS 15.7 and iPadOS …