CWE-204

Observable Response Discrepancy

The product provides different responses to incoming requests in a way that reveals internal state information to an unauthorized actor outside of the intended control sphere.

CVE-2016-9499 (GCVE-0-2016-9499)
Vulnerability from cvelistv5
Published
2018-07-13 20:00
Modified
2024-08-06 02:50
Severity ?
CWE
Summary
Accellion FTP server prior to version FTA_9_12_220 only returns the username in the server response if the username is invalid. An attacker may use this information to determine valid user accounts and enumerate them.
References
Impacted products
Vendor Product Version
Accellion FTP Server Version: FTA_9_12_220   < FTA_9_12_220
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CVE-2020-11063 (GCVE-0-2020-11063)
Vulnerability from cvelistv5
Published
2020-05-13 22:15
Modified
2024-12-03 19:08
Severity ?
3.7 (Low) - CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N
CWE
  • CWE-204 - Observable Response Discrepancy
Summary
In TYPO3 CMS versions 10.4.0 and 10.4.1, it has been discovered that time-based attacks can be used with the password reset functionality for backend users. This allows an attacker to mount user enumeration based on email addresses assigned to backend user accounts. This has been fixed in 10.4.2.
References
Impacted products
Vendor Product Version
TYPO3 TYPO3 CMS Version: >= 10.4.0, <= 10.4.1
 Create a notification for this product.
Show details on NVD website

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CVE-2021-20049 (GCVE-0-2021-20049)
Vulnerability from cvelistv5
Published
2021-12-23 01:20
Modified
2024-08-03 17:30
Severity ?
CWE
  • CWE-204 - Observable Response Discrepancy
Summary
A vulnerability in SonicWall SMA100 password change API allows a remote unauthenticated attacker to perform SMA100 username enumeration based on the server responses. This vulnerability impacts 10.2.1.2-24sv, 10.2.0.8-37sv and earlier 10.x versions.
References
Impacted products
Vendor Product Version
SonicWall SonicWall SMA100 Version: 10.2.0.8-37sv and earlier
Version: 10.2.1.2-24sv and earlier
 Create a notification for this product.
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CVE-2021-20556 (GCVE-0-2021-20556)
Vulnerability from cvelistv5
Published
2024-05-03 17:31
Modified
2024-08-03 17:45
Severity ?
5.3 (Medium) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
CWE
  • CWE-204 - Response Discrepancy Information Exposure
Summary
IBM Cognos Controller 10.4.1, 10.4.2, and 11.0.0 could allow a remote user to enumerate usernames due to differentiating error messages on existing usernames. IBM X-Force ID: 199181.
References
Impacted products
Vendor Product Version
IBM Cognos Controller Version: 10.4.1, 10.4.2, 11.0.0
 Create a notification for this product.
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CVE-2021-34580 (GCVE-0-2021-34580)
Vulnerability from cvelistv5
Published
2021-10-27 10:25
Modified
2024-09-17 01:41
Severity ?
7.5 (High) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
CWE
  • CWE-204 - Response Discrepancy Information Exposure
Summary
In mymbCONNECT24, mbCONNECT24 <= 2.9.0 an unauthenticated user can enumerate valid backend users by checking what kind of response the server sends for crafted invalid login attempts.
References
Impacted products
Vendor Product Version
MB connect line mymbCONNECT24 Version: 2.9.0   <
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CVE-2021-36201 (GCVE-0-2021-36201)
Vulnerability from cvelistv5
Published
2022-10-11 20:17
Modified
2025-05-15 18:42
Severity ?
4.3 (Medium) - CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
CWE
  • CWE-204 - Observable Response Discrepancy
Summary
Under certain circumstances a CCURE Portal user could enumerate user accounts in CCURE 9000 version 2.90 and prior versions.
References
Impacted products
Vendor Product Version
Johnson Controls C•CURE 9000 Version: 2.90 and ealier   <
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CVE-2021-38476 (GCVE-0-2021-38476)
Vulnerability from cvelistv5
Published
2021-10-19 12:10
Modified
2024-09-16 16:17
Severity ?
6.5 (Medium) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
CWE
  • CWE-204 - OBSERVABLE RESPONSE DISCREPANCY
Summary
InHand Networks IR615 Router's Versions 2.3.0.r4724 and 2.3.0.r4870 authentication process response indicates and validates the existence of a username. This may allow an attacker to enumerate different user accounts.
References
Impacted products
Vendor Product Version
InHand Networks IR615 Router Version: 2.3.0.r4724 and 2.3.0.r4870
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CVE-2021-39189 (GCVE-0-2021-39189)
Vulnerability from cvelistv5
Published
2021-09-15 13:50
Modified
2024-08-04 01:58
Severity ?
5.3 (Medium) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
CWE
  • CWE-204 - Observable Response Discrepancy
Summary
Pimcore is an open source data & experience management platform. In versions prior to 10.1.3, it is possible to enumerate usernames via the forgot password functionality. This issue is fixed in version 10.1.3. As a workaround, one may apply the available patch manually.
References
Impacted products
Vendor Product Version
pimcore pimcore Version: < 10.1.3
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CVE-2022-0564 (GCVE-0-2022-0564)
Vulnerability from cvelistv5
Published
2022-02-21 00:00
Modified
2025-04-25 15:46
Severity ?
5.3 (Medium) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
CWE
  • CWE-204 - Observable Response Discrepancy
Summary
A vulnerability in Qlik Sense Enterprise on Windows could allow an remote attacker to enumerate domain user accounts. An attacker could exploit this vulnerability by sending authentication requests to an affected system. A successful exploit could allow the attacker to compare the response time that are returned by the affected system to determine which accounts are valid user accounts. Affected systems are only vulnerable if they have LDAP configured. The affected URI is /internal_forms_authentication/ the response time of the form is longer if the supplied user does not exists and shorter if the user exists.
References
Impacted products
Vendor Product Version
Qlik Sense Qlik Sense Enterprise on Windows Version: 14.x   < 14.44.0
 Create a notification for this product.
Show details on NVD website

To clipboard 

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CVE-2022-1989 (GCVE-0-2022-1989)
Vulnerability from cvelistv5
Published
2022-08-23 09:55
Modified
2024-09-16 18:29
Severity ?
5.3 (Medium) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
CWE
  • CWE-204 - Response Discrepancy Information Exposure
Summary
All CODESYS Visualization versions before V4.2.0.0 generate a login dialog vulnerable to information exposure allowing a remote, unauthenticated attacker to enumerate valid users.
References
Impacted products
Vendor Product Version
CODESYS CODESYS Visualization Version: V3   < V4.2.0.0
 Create a notification for this product.
Show details on NVD website

To clipboard 

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Mitigation ID: MIT-46

Phase: Architecture and Design

Strategy: Separation of Privilege

Description:

  • Compartmentalize the system to have "safe" areas where trust boundaries can be unambiguously drawn. Do not allow sensitive data to go outside of the trust boundary and always be careful when interfacing with a compartment outside of the safe area.
  • Ensure that appropriate compartmentalization is built into the system design, and the compartmentalization allows for and reinforces privilege separation functionality. Architects and designers should rely on the principle of least privilege to decide the appropriate time to use privileges and the time to drop privileges.
Mitigation ID: MIT-39

Phase: Implementation

Description:

  • Ensure that error messages only contain minimal details that are useful to the intended audience and no one else. The messages need to strike the balance between being too cryptic (which can confuse users) or being too detailed (which may reveal more than intended). The messages should not reveal the methods that were used to determine the error. Attackers can use detailed information to refine or optimize their original attack, thereby increasing their chances of success.
  • If errors must be captured in some detail, record them in log messages, but consider what could occur if the log messages can be viewed by attackers. Highly sensitive information such as passwords should never be saved to log files.
  • Avoid inconsistent messaging that might accidentally tip off an attacker about internal state, such as whether a user account exists or not.
CAPEC-331: ICMP IP Total Length Field Probe

An adversary sends a UDP packet to a closed port on the target machine to solicit an IP Header's total length field value within the echoed 'Port Unreachable" error message. This type of behavior is useful for building a signature-base of operating system responses, particularly when error messages contain other types of information that is useful identifying specific operating system responses.

CAPEC-332: ICMP IP 'ID' Field Error Message Probe

An adversary sends a UDP datagram having an assigned value to its internet identification field (ID) to a closed port on a target to observe the manner in which this bit is echoed back in the ICMP error message. This allows the attacker to construct a fingerprint of specific OS behaviors.

CAPEC-541: Application Fingerprinting

An adversary engages in fingerprinting activities to determine the type or version of an application installed on a remote target.

CAPEC-580: System Footprinting

An adversary engages in active probing and exploration activities to determine security information about a remote target system. Often times adversaries will rely on remote applications that can be probed for system configurations.

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