Common Weakness Enumeration

CWE-158

Allowed

Improper Neutralization of Null Byte or NUL Character

Abstraction: Variant · Status: Incomplete

API response cwe.mitre.org

The product receives input from an upstream component, but it does not neutralize or incorrectly neutralizes NUL characters or null bytes when they are sent to a downstream component.

35 vulnerabilities reference this CWE, most recent first.

CVE-2022-20813 (GCVE-0-2022-20813)

Vulnerability from cvelistv5 – Published: 2022-07-06 20:30 – Updated: 2024-11-06 16:11
VLAI
Title
Cisco Expressway Series and Cisco TelePresence Video Communication Server Vulnerabilities
Summary
Multiple vulnerabilities in the API and in the web-based management interface of Cisco Expressway Series and Cisco TelePresence Video Communication Server (VCS) could allow a remote attacker to overwrite arbitrary files or conduct null byte poisoning attacks on an affected device. Note: Cisco Expressway Series refers to the Expressway Control (Expressway-C) device and the Expressway Edge (Expressway-E) device. For more information about these vulnerabilities, see the Details section of this advisory.
Severity
9 (Critical)
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:L
SSVC
Exploitation: none Automatable: no Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2024-11-06 16:00 UTC
CWE
Assigner
cisco CNA
References
URL Tags
https://tools.cisco.com/security/center/content/C… vendor-advisoryx_refsource_CISCO
Impacted products
Date Public
2022-07-06 00:00
Show details on NVD website
To clipboard 

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CVE-2022-20812 (GCVE-0-2022-20812)

Vulnerability from cvelistv5 – Published: 2022-07-06 20:30 – Updated: 2024-11-06 16:11
VLAI
Title
Cisco Expressway Series and Cisco TelePresence Video Communication Server Vulnerabilities
Summary
Multiple vulnerabilities in the API and in the web-based management interface of Cisco Expressway Series and Cisco TelePresence Video Communication Server (VCS) could allow a remote attacker to overwrite arbitrary files or conduct null byte poisoning attacks on an affected device. Note: Cisco Expressway Series refers to the Expressway Control (Expressway-C) device and the Expressway Edge (Expressway-E) device. For more information about these vulnerabilities, see the Details section of this advisory.
Severity
9 (Critical)
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:L
SSVC
Exploitation: none Automatable: no Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2024-11-06 16:00 UTC
CWE
Assigner
cisco CNA
References
Impacted products
Date Public
2022-07-06 00:00
Show details on NVD website
To clipboard 

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CVE-2020-14500 (GCVE-0-2020-14500)

Vulnerability from cvelistv5 – Published: 2020-08-25 13:12 – Updated: 2024-09-17 03:34
VLAI
Title
IMPROPER NEUTRALIZATION OF NULL BYTE OR NUL CHARACTER CWE-158
Summary
Secomea GateManager all versions prior to 9.2c, An attacker can send a negative value and overwrite arbitrary data.
Severity
10 (Critical)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
CWE
  • CWE-158 - IMPROPER NEUTRALIZATION OF NULL BYTE OR NUL CHARACTER CWE-158
Assigner
icscert CNA
References
Impacted products
Date Public
2020-07-28 00:00
Show details on NVD website
To clipboard 

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CVE-2020-7928 (GCVE-0-2020-7928)

Vulnerability from cvelistv5 – Published: 2020-11-23 16:35 – Updated: 2024-09-17 00:20
VLAI
Title
Improper neutralization of null byte leads to read overrun
Summary
A user authorized to perform database queries may trigger a read overrun and access arbitrary memory by issuing specially crafted queries. This issue affects MongoDB Server v4.4 versions prior to 4.4.1; MongoDB Server v4.2 versions prior to 4.2.9; MongoDB Server v4.0 versions prior to 4.0.20 and MongoDB Server v3.6 versions prior to 3.6.20.
Severity
6.5 (Medium)
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
CWE
  • CWE-158 - Improper Neutralization of Null Byte or NUL Character
Assigner
mongodb CNA
References
Impacted products
Vendor Product Version
MongoDB Inc. MongoDB Server Affected: 4.4 , < 4.4.1 (custom)
Affected: 4.2 , < 4.2.9 (custom)
Affected: 4.0 , < 4.0.20 (custom)
Affected: 3.6 , < 3.6.20 (custom)
Create a notification for this product.
Date Public
2020-11-23 00:00
Show details on NVD website
To clipboard 

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CVE-2020-5363 (GCVE-0-2020-5363)

Vulnerability from cvelistv5 – Published: 2020-06-10 20:40 – Updated: 2024-09-16 20:53
VLAI
Summary
Select Dell Client Consumer and Commercial platforms include an issue that allows the BIOS Admin password to be changed through Dell's manageability interface without knowledge of the current BIOS Admin password. This could potentially allow an unauthorized actor, with physical access and/or OS administrator privileges to the device, to gain privileged access to the platform and the hard drive.
Severity
8.6 (High)
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H
CWE
  • CWE-158 - Improper Neutralization of Null Byte or NUL Character
Assigner
dell CNA
References
Impacted products
Vendor Product Version
Dell Dell Client Consumer and Commercial platforms Affected: https://www.dell.com/support/article/SLN321604
Create a notification for this product.
Date Public
2020-06-02 00:00
Show details on NVD website
To clipboard 

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Mitigation

Developers should anticipate that null characters or null bytes will be injected/removed/manipulated in the input vectors of their product. Use an appropriate combination of denylists and allowlists to ensure only valid, expected and appropriate input is processed by the system.

Mitigation MIT-5
Implementation

Strategy: Input Validation

  • 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.
Mitigation MIT-20
Implementation

Strategy: Input Validation

Inputs should be decoded and canonicalized to the application's current internal representation before being validated (CWE-180). Make sure that the application does not decode the same input twice (CWE-174). Such errors could be used to bypass allowlist validation schemes by introducing dangerous inputs after they have been checked.

CAPEC-52: Embedding NULL Bytes

An adversary embeds one or more null bytes in input to the target software. This attack relies on the usage of a null-valued byte as a string terminator in many environments. The goal is for certain components of the target software to stop processing the input when it encounters the null byte(s).

CAPEC-53: Postfix, Null Terminate, and Backslash

If a string is passed through a filter of some kind, then a terminal NULL may not be valid. Using alternate representation of NULL allows an adversary to embed the NULL mid-string while postfixing the proper data so that the filter is avoided. One example is a filter that looks for a trailing slash character. If a string insertion is possible, but the slash must exist, an alternate encoding of NULL in mid-string may be used.

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