Weakness (CWE)
CWE-120: Buffer Copy without Checking Size of Input
The product copies an input buffer to an output buffer without verifying that the size of the input buffer is less than the size of the output buffer.
How to prevent it (8 mitigations)
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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.
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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.
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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.
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Implementation
Consider adhering to the following rules when allocating and managing an application's memory:
- Double check that your buffer is as large as you specify.
- 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.
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Implementation
Assume all input is malicious. Use an "accept known good" input validation strategy, i.e., use a list of acceptable inputs that strictly conform to specifications. Reject any input that does not strictly conform to specifications, or transform it into something that does.
When performing input validation, consider all potentially relevant properties, including length, type of input, the full range of acceptable values, missing or extra inputs, syntax, consistency across related fields, and conformance to business rules. As an example of business rule logic, "boat" may be syntactically valid because it only contains alphanumeric characters, but it is not valid if the input is only expected to contain colors such as "red" or "blue."
Do not rely exclusively on looking for malicious or malformed inputs. This is likely to miss at least one undesirable input, especially if the code's environment changes. This can give attackers enough room to bypass the intended validation. However, denylists can be useful for detecting potential attacks or determining which inputs are so malformed that they should be rejected outright.
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Architecture and Design
For any security checks that are performed on the client side, ensure that these checks are duplicated on the server side, in order to avoid CWE-602. Attackers can bypass the client-side checks by modifying values after the checks have been performed, or by changing the client to remove the client-side checks entirely. Then, these modified values would be submitted to the server.
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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].
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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].
Source: MITRE CWE-120
3,303 results · Feed
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High 8.8
TOTOLINK A3002R/A3002RU HTTP POST Request formMapDel buffer overflow
A vulnerability was found in TOTOLINK A3002R and A3002RU 3.0.0-B20230809.1615. It has been rated as critical. Affected by this issue is some unknown functionality of the file /boafrm/formMapDel of the component HTTP POST Request Handler. The manipulation of t…
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Medium 6.5
Zoom Workplace Apps for Windows - Buffer Over-read
Buffer over-read in some Zoom Workplace Apps for Windows may allow an authenticated user to conduct a denial of service via network access.
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High 7.5
WS-WN572HP3 V230525 was discovered to contain a buffer overflow in the component /www/cgi-bin/upload.cgi. This vulnerab…
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Medium 5.4
TOTOLINK A3002R v4.0.0-B20230531.1404 was discovered to contain a buffer overflow via the addrPoolStart parameter in th…
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Medium 5.4
TOTOLINK A3002R v4.0.0-B20230531.1404 was discovered to contain a buffer overflow via the addrPoolEnd parameter in the …
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Critical 9.8
TOTOLINK A3002R v4.0.0-B20230531.1404 was discovered to contain a buffer overflow via the macstr parameter in the formM…
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Critical 9.8
TOTOLINK A3002R v4.0.0-B20230531.1404 was discovered to contain a buffer overflow via the dnsaddr parameter in the form…
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Critical 9.8
TOTOLINK A3002R v4.0.0-B20230531.1404 was discovered to contain a buffer overflow via the routername parameter in the f…
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Medium 5.4
TOTOLINK A3002R v4.0.0-B20230531.1404 was discovered to contain a buffer overflow via the bandstr parameter in the form…
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High 8.0
The issue was addressed with improved checks. This issue is fixed in Safari 18.5, iOS 18.5 and iPadOS 18.5, macOS Sequo…
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High 7.5
AUMA Riester: Buffer overflow in service telegram
An unauthenticated remote attacker can cause a buffer overflow which could lead to unexpected behaviour or DoS via Bluetooth or RS-232 interface.
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Critical 9.8
Tenda AC10 V1.0re_V15.03.06.46 is vulnerable to Buffer Overflow in the formSetPPTPUserList handler via the list POST pa…
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Medium 5.4
Tenda AC10 v4 V16.03.10.13 is vulnerable to Buffer Overflow in the GetParentControlInfo function.
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Medium 5.3
code-projects Simple Banking System Sign In buffer overflow
A vulnerability was found in code-projects Simple Banking System up to 1.0. It has been rated as critical. This issue affects some unknown processing of the component Sign In. The manipulation of the argument password2 leads to buffer overflow. Attacking loca…
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High 8.8
TOTOLINK T10/A3100R/A950RG/A800R/N600R/A3000RU/A810R cstecgi.cgi CloudACMunualUpdate buffer overflow
A vulnerability was found in TOTOLINK T10, A3100R, A950RG, A800R, N600R, A3000RU and A810R 4.1.8cu.5241_B20210927. It has been declared as critical. This vulnerability affects the function CloudACMunualUpdate of the file /cgi-bin/cstecgi.cgi. The manipulation…
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High 8.8
TOTOLINK N150RT formWsc buffer overflow
A vulnerability, which was classified as critical, has been found in TOTOLINK N150RT 3.4.0-B20190525. This issue affects some unknown processing of the file /boafrm/formWsc. The manipulation of the argument localPin leads to buffer overflow. The attack may be…
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High 8.8
D-Link DIR-619L formSetWizard2 buffer overflow
A vulnerability was found in D-Link DIR-619L 2.04B04 and classified as critical. Affected by this issue is the function formSetWizard2. The manipulation of the argument curTime leads to buffer overflow. The attack may be launched remotely. The vendor was cont…
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High 8.8
D-Link DIR-619L formSetWAN_Wizard52 buffer overflow
A vulnerability has been found in D-Link DIR-619L 2.04B04 and classified as critical. Affected by this vulnerability is the function formSetWAN_Wizard52. The manipulation of the argument curTime leads to buffer overflow. The attack can be launched remotely. T…
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High 8.8
D-Link DIR-619L formSetEasy_Wizard buffer overflow
A vulnerability, which was classified as critical, was found in D-Link DIR-619L 2.04B04. Affected is the function formSetEasy_Wizard. The manipulation of the argument curTime leads to buffer overflow. It is possible to launch the attack remotely. The vendor w…
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High 8.8
D-Link DIR-619L formEasySetupWizard3 buffer overflow
A vulnerability, which was classified as critical, has been found in D-Link DIR-619L 2.04B04. This issue affects the function formEasySetupWizard3. The manipulation of the argument wan_connected leads to buffer overflow. The attack may be initiated remotely. …
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High 8.8
D-Link DIR-619L formEasySetupWizard buffer overflow
A vulnerability classified as critical was found in D-Link DIR-619L 2.04B04. This vulnerability affects the function formEasySetupWizard. The manipulation of the argument curTime leads to buffer overflow. The attack can be initiated remotely. The vendor was c…
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High 8.0
H3C GR-5400AX aspForm Edit_List_SSID buffer overflow
A vulnerability has been found in H3C GR-5400AX up to 100R008 and classified as critical. This vulnerability affects the function Edit_List_SSID of the file /goform/aspForm. The manipulation of the argument param leads to buffer overflow. The attack needs to …
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High 8.8
D-Link DIR-605L formSetWAN_Wizard55 buffer overflow
A vulnerability was found in D-Link DIR-605L 2.13B01. It has been declared as critical. This vulnerability affects the function formSetWAN_Wizard55. The manipulation of the argument curTime leads to buffer overflow. The attack can be initiated remotely. The v…
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High 8.8
D-Link DIR-605L formSetWAN_Wizard534 buffer overflow
A vulnerability was found in D-Link DIR-605L 2.13B01. It has been classified as critical. This affects the function formSetWAN_Wizard534. The manipulation of the argument curTime leads to buffer overflow. It is possible to initiate the attack remotely. The ve…
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High 8.0
H3C GR-1800AX aspForm EnableIpv6 buffer overflow
A vulnerability was found in H3C GR-1800AX up to 100R008 and classified as critical. Affected by this issue is the function EnableIpv6 of the file /goform/aspForm. The manipulation of the argument param leads to buffer overflow. Access to the local network is…
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Medium 6.9
Buffer Copy without Checking Size of Input ('Classic Buffer Overflow'), Stack-based Buffer Overflow vulnerability in RTI Connext Professional (Core Libraries) allows Overflow Variables and Tags.
Buffer Copy without Checking Size of Input ('Classic Buffer Overflow'), Stack-based Buffer Overflow vulnerability in RTI Connext Professional (Core Libraries) allows Overflow Variables and Tags. This issue affects Connext Professional: from 7.4.0 before 7.5.0…
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High 7.8
udmabuf: fix a buf size overflow issue during udmabuf creation
In the Linux kernel, the following vulnerability has been resolved: udmabuf: fix a buf size overflow issue during udmabuf creation by casting size_limit_mb to u64 when calculate pglimit.
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High 7.5
BIG-IP APM PingAccess Virtual Server Vulnerability
When a BIG-IP APM virtual server is configured to use a PingAccess profile, undisclosed requests can cause TMM to terminate. Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated.
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High 7.5
BIG-IP HTTP vulnerability
When an HTTP profile with the Enforce RFC Compliance option is configured on a virtual server, undisclosed requests can cause the Traffic Management Microkernel (TMM) to terminate. Note: Software versions which have reached End of Technical Support (EoTS) are…
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High 8.8
Tenda AC8 MtuSetMacWan formGetRouterStatus buffer overflow
A vulnerability, which was classified as critical, was found in Tenda AC8 16.03.34.06. Affected is the function formGetRouterStatus of the file /goform/MtuSetMacWan. The manipulation of the argument shareSpeed leads to buffer overflow. It is possible to launc…
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High 8.8
D-Link DIR-600L formSetWanL2TP buffer overflow
A vulnerability was found in D-Link DIR-600L up to 2.07B01. It has been rated as critical. Affected by this issue is the function formSetWanL2TP. The manipulation of the argument host leads to buffer overflow. The attack may be launched remotely. This vulnera…
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High 8.8
D-Link DIR-600L formWlSiteSurvey buffer overflow
A vulnerability was found in D-Link DIR-600L up to 2.07B01. It has been declared as critical. Affected by this vulnerability is the function formWlSiteSurvey. The manipulation of the argument host leads to buffer overflow. The attack can be launched remotely.…
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High 8.8
D-Link DIR-600L formSetWAN_Wizard534 buffer overflow
A vulnerability was found in D-Link DIR-600L up to 2.07B01. It has been classified as critical. Affected is the function formSetWAN_Wizard534. The manipulation of the argument host leads to buffer overflow. It is possible to launch the attack remotely. This v…
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High 8.8
D-Link DIR-600L formSetLog buffer overflow
A vulnerability was found in D-Link DIR-600L up to 2.07B01 and classified as critical. This issue affects the function formSetLog. The manipulation of the argument host leads to buffer overflow. The attack may be initiated remotely. This vulnerability only af…
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High 8.8
D-Link DIR-600L formLogin buffer overflow
A vulnerability, which was classified as critical, was found in D-Link DIR-600L up to 2.07B01. This affects the function formLogin. The manipulation of the argument host leads to buffer overflow. It is possible to initiate the attack remotely. This vulnerabil…
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Low 3.3
arkcompiler_ets_runtime has a buffer overflow vulnerability
in OpenHarmony v5.0.3 and prior versions allow a local attacker cause DOS through buffer overflow.
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High 8.8
D-Link DIR-600L formEasySetupWizard buffer overflow
A vulnerability has been found in D-Link DIR-600L up to 2.07B01 and classified as critical. This vulnerability affects the function formEasySetupWizard. The manipulation of the argument host leads to buffer overflow. The attack can be initiated remotely. This…
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Medium 6.6
Buffer Copy Without Checking Size of Input (`Classic Buffer Overflow`) in Audio
Memory corruption while processing an IOCTL call to set mixer controls.
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Medium 6.7
Buffer Copy Without Checking Size of Input (`Classic Buffer Overflow`) in Camera
Memory corruption can occur during context user dumps due to inadequate checks on buffer length.
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High 8.8
D-Link DIR-600L formEasySetupWizard3 buffer overflow
A vulnerability, which was classified as critical, has been found in D-Link DIR-600L up to 2.07B01. Affected by this issue is the function formEasySetupWizard3. The manipulation of the argument host leads to buffer overflow. The attack may be launched remotel…