CWE-400
DiscouragedUncontrolled Resource Consumption
Abstraction: Class · Status: Draft
The product does not properly control the allocation and maintenance of a limited resource.
5433 vulnerabilities reference this CWE, most recent first.
GHSA-PVMM-FGF7-R833
Vulnerability from github – Published: 2023-03-29 21:30 – Updated: 2025-02-18 15:31Rocket Software UniData versions prior to 8.2.4 build 3003 and UniVerse versions prior to 11.3.5 build 1001 or 12.2.1 build 2002 suffer from a memory-exhaustion issue, where a decompression routine will allocate increasing amounts of memory until all system memory is exhausted and the forked process crashes.
{
"affected": [],
"aliases": [
"CVE-2023-28507"
],
"database_specific": {
"cwe_ids": [
"CWE-400"
],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2023-03-29T21:15:00Z",
"severity": "CRITICAL"
},
"details": "Rocket Software UniData versions prior to 8.2.4 build 3003 and UniVerse versions prior to 11.3.5 build 1001 or 12.2.1 build 2002 suffer from a memory-exhaustion issue, where a decompression routine will allocate increasing amounts of memory until all system memory is exhausted and the forked process crashes.",
"id": "GHSA-pvmm-fgf7-r833",
"modified": "2025-02-18T15:31:04Z",
"published": "2023-03-29T21:30:15Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2023-28507"
},
{
"type": "WEB",
"url": "https://www.rapid7.com/blog/post/2023/03/29/multiple-vulnerabilities-in-rocket-software-unirpc-server-fixed"
}
],
"schema_version": "1.4.0",
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
"type": "CVSS_V3"
}
]
}
GHSA-PVP8-3XJ6-8C6X
Vulnerability from github – Published: 2025-05-09 12:31 – Updated: 2025-05-09 15:54Uncontrolled Resource Consumption vulnerability in Apache Commons Configuration 1.x.
There are a number of issues in Apache Commons Configuration 1.x that allow excessive resource consumption when loading untrusted configurations or using unexpected usage patterns. The Apache Commons Configuration team does not intend to fix these issues in 1.x. Apache Commons Configuration 1.x is still safe to use in scenarios where you only load trusted configurations.
Users that load untrusted configurations or give attackers control over usage patterns are recommended to upgrade to the 2.x version line, which fixes these issues. Apache Commons Configuration 2.x is not a drop-in replacement, but as it uses a separate Maven groupId and Java package namespace they can be loaded side-by-side, making it possible to do a gradual migration.
{
"affected": [
{
"package": {
"ecosystem": "Maven",
"name": "commons-configuration:commons-configuration"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"last_affected": "1.10"
}
],
"type": "ECOSYSTEM"
}
]
}
],
"aliases": [
"CVE-2025-46392"
],
"database_specific": {
"cwe_ids": [
"CWE-400"
],
"github_reviewed": true,
"github_reviewed_at": "2025-05-09T15:54:59Z",
"nvd_published_at": "2025-05-09T10:15:17Z",
"severity": "LOW"
},
"details": "Uncontrolled Resource Consumption vulnerability in Apache Commons Configuration 1.x.\n\nThere are a number of issues in Apache Commons Configuration 1.x that allow excessive resource consumption when loading untrusted configurations or using unexpected usage patterns. The Apache Commons Configuration team does not intend to fix these issues in 1.x. Apache Commons Configuration 1.x is still safe to use in scenarios where you only load trusted configurations. \n\nUsers that load untrusted configurations or give attackers control over usage patterns are recommended to upgrade to the 2.x version line, which fixes these issues. Apache Commons Configuration 2.x is not a drop-in replacement, but as it uses a separate Maven groupId and Java package namespace they can be loaded side-by-side, making it possible to do a gradual migration.",
"id": "GHSA-pvp8-3xj6-8c6x",
"modified": "2025-05-09T15:54:59Z",
"published": "2025-05-09T12:31:33Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2025-46392"
},
{
"type": "PACKAGE",
"url": "https://github.com/apache/commons-configuration"
},
{
"type": "WEB",
"url": "https://lists.apache.org/thread/y1pl0mn3opz6kwkm873zshjdxq3dwq5s"
},
{
"type": "WEB",
"url": "https://www.cve.org/CVERecord?id=CVE-2024-29131"
},
{
"type": "WEB",
"url": "https://www.cve.org/CVERecord?id=CVE-2024-29133"
}
],
"schema_version": "1.4.0",
"severity": [
{
"score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:U",
"type": "CVSS_V4"
}
],
"summary": "Apache Commons Configuration Uncontrolled Resource Consumption"
}
GHSA-PVQR-QR3W-3JPG
Vulnerability from github – Published: 2025-09-08 21:30 – Updated: 2025-09-08 21:30Adacore Ada Web Server (AWS) before 25.2 is vulnerable to a denial-of-service (DoS) condition due to improper handling of SSL handshakes during connection initialization. When a client initiates an HTTPS connection, the server performs the SSL handshake before assigning the connection to a processing slot. However, there is no specific timeout set for this phase, and the server uses the default socket timeout, which is effectively infinite. An attacker can exploit this by sending a malformed TLS ClientHello message with incorrect length values. This causes the server to wait indefinitely for data that never arrives, blocking the worker thread (Line) handling the connection. By opening multiple such connections, up to the server's maximum limit, the attacker can exhaust all available working threads, preventing the server from handling new, legitimate requests.
{
"affected": [],
"aliases": [
"CVE-2025-52494"
],
"database_specific": {
"cwe_ids": [
"CWE-400"
],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2025-09-03T18:15:35Z",
"severity": "HIGH"
},
"details": "Adacore Ada Web Server (AWS) before 25.2 is vulnerable to a denial-of-service (DoS) condition due to improper handling of SSL handshakes during connection initialization. When a client initiates an HTTPS connection, the server performs the SSL handshake before assigning the connection to a processing slot. However, there is no specific timeout set for this phase, and the server uses the default socket timeout, which is effectively infinite. An attacker can exploit this by sending a malformed TLS ClientHello message with incorrect length values. This causes the server to wait indefinitely for data that never arrives, blocking the worker thread (Line) handling the connection. By opening multiple such connections, up to the server\u0027s maximum limit, the attacker can exhaust all available working threads, preventing the server from handling new, legitimate requests.",
"id": "GHSA-pvqr-qr3w-3jpg",
"modified": "2025-09-08T21:30:58Z",
"published": "2025-09-08T21:30:58Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2025-52494"
},
{
"type": "WEB",
"url": "https://adacore.com"
},
{
"type": "WEB",
"url": "https://docs.adacore.com/corp/security-advisories/SEC.AWS-0095-v1.pdf"
}
],
"schema_version": "1.4.0",
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
"type": "CVSS_V3"
}
]
}
GHSA-PVRG-Q6JW-42P7
Vulnerability from github – Published: 2026-06-23 15:32 – Updated: 2026-06-30 03:37Traefik before 2.10.5 and 3.0.0-beta4 is affected by a denial-of-service vulnerability in HTTP/2 request handling inherited from the Go standard library's HTTP/2 implementation (CVE-2023-44487 / CVE-2023-39325, the 'Rapid Reset' technique). A remote attacker can rapidly create and cancel HTTP/2 streams to exhaust server resources and cause service unavailability.
{
"affected": [],
"aliases": [
"CVE-2023-54365"
],
"database_specific": {
"cwe_ids": [
"CWE-400",
"CWE-770"
],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2026-06-23T13:16:30Z",
"severity": "HIGH"
},
"details": "Traefik before 2.10.5 and 3.0.0-beta4 is affected by a denial-of-service vulnerability in HTTP/2 request handling inherited from the Go standard library\u0027s HTTP/2 implementation (CVE-2023-44487 / CVE-2023-39325, the \u0027Rapid Reset\u0027 technique). A remote attacker can rapidly create and cancel HTTP/2 streams to exhaust server resources and cause service unavailability.",
"id": "GHSA-pvrg-q6jw-42p7",
"modified": "2026-06-30T03:37:08Z",
"published": "2026-06-23T15:32:36Z",
"references": [
{
"type": "WEB",
"url": "https://github.com/traefik/traefik/security/advisories/GHSA-7v4p-328v-8v5g"
},
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2023-54365"
},
{
"type": "WEB",
"url": "https://access.redhat.com/security/cve/CVE-2023-54365"
},
{
"type": "WEB",
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2491710"
},
{
"type": "WEB",
"url": "https://security.access.redhat.com/data/csaf/v2/vex/2023/cve-2023-54365.json"
},
{
"type": "WEB",
"url": "https://www.vulncheck.com/advisories/traefik-denial-of-service-via-http-2-request-handling"
}
],
"schema_version": "1.4.0",
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
"type": "CVSS_V3"
},
{
"score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X",
"type": "CVSS_V4"
}
]
}
GHSA-PVRW-G6FX-MCX2
Vulnerability from github – Published: 2023-07-06 19:24 – Updated: 2023-07-06 21:46is.js is a general-purpose check library. Versions 0.9.0 and prior contain one or more regular expressions that are vulnerable to Regular Expression Denial of Service (ReDoS). is.js uses a regex copy-pasted from a gist to validate URLs. Trying to validate a malicious string can cause the regex to loop "forever." This vulnerability was found using a CodeQL query which identifies inefficient regular expressions. is.js has no patch for this issue.
{
"affected": [
{
"package": {
"ecosystem": "npm",
"name": "is_js"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"last_affected": "0.9.0"
}
],
"type": "ECOSYSTEM"
}
]
}
],
"aliases": [
"CVE-2020-26302"
],
"database_specific": {
"cwe_ids": [
"CWE-1333",
"CWE-400"
],
"github_reviewed": true,
"github_reviewed_at": "2023-07-06T21:46:34Z",
"nvd_published_at": "2022-12-22T21:15:00Z",
"severity": "HIGH"
},
"details": "is.js is a general-purpose check library. Versions 0.9.0 and prior contain one or more regular expressions that are vulnerable to Regular Expression Denial of Service (ReDoS). is.js uses a regex copy-pasted from a gist to validate URLs. Trying to validate a malicious string can cause the regex to loop \"forever.\" This vulnerability was found using a CodeQL query which identifies inefficient regular expressions. is.js has no patch for this issue.",
"id": "GHSA-pvrw-g6fx-mcx2",
"modified": "2023-07-06T21:46:34Z",
"published": "2023-07-06T19:24:05Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2020-26302"
},
{
"type": "WEB",
"url": "https://github.com/arasatasaygin/is.js/issues/320"
},
{
"type": "PACKAGE",
"url": "https://github.com/arasatasaygin/is.js"
},
{
"type": "ADVISORY",
"url": "https://securitylab.github.com/advisories/GHSL-2020-295-redos-is.js"
}
],
"schema_version": "1.4.0",
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
"type": "CVSS_V3"
}
],
"summary": "is_js vulnerable to Regular Expression Denial of Service"
}
GHSA-PVW6-VC2C-X7V5
Vulnerability from github – Published: 2024-01-17 00:30 – Updated: 2025-06-20 21:31Vulnerability in the MySQL Server product of Oracle MySQL (component: Server: DML). Supported versions that are affected are 8.0.34 and prior. Easily exploitable vulnerability allows high privileged attacker with network access via multiple protocols to compromise MySQL Server. Successful attacks of this vulnerability can result in unauthorized ability to cause a hang or frequently repeatable crash (complete DOS) of MySQL Server. CVSS 3.1 Base Score 4.9 (Availability impacts). CVSS Vector: (CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H).
{
"affected": [],
"aliases": [
"CVE-2024-20983"
],
"database_specific": {
"cwe_ids": [
"CWE-400"
],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2024-01-16T22:15:45Z",
"severity": "MODERATE"
},
"details": "Vulnerability in the MySQL Server product of Oracle MySQL (component: Server: DML). Supported versions that are affected are 8.0.34 and prior. Easily exploitable vulnerability allows high privileged attacker with network access via multiple protocols to compromise MySQL Server. Successful attacks of this vulnerability can result in unauthorized ability to cause a hang or frequently repeatable crash (complete DOS) of MySQL Server. CVSS 3.1 Base Score 4.9 (Availability impacts). CVSS Vector: (CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H).",
"id": "GHSA-pvw6-vc2c-x7v5",
"modified": "2025-06-20T21:31:43Z",
"published": "2024-01-17T00:30:21Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2024-20983"
},
{
"type": "WEB",
"url": "https://security.netapp.com/advisory/ntap-20240201-0009"
},
{
"type": "WEB",
"url": "https://www.oracle.com/security-alerts/cpujan2024.html"
}
],
"schema_version": "1.4.0",
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H",
"type": "CVSS_V3"
}
]
}
GHSA-PVX3-GM3C-GMPR
Vulnerability from github – Published: 2022-03-05 00:00 – Updated: 2022-03-18 20:06A design flaw in Go-Ethereum 1.10.12 and older versions allows an attacker node to send 5120 future transactions with a high gas price in one message, which can purge all of pending transactions in a victim node's memory pool, causing a denial of service (DoS).
{
"affected": [
{
"package": {
"ecosystem": "Go",
"name": "github.com/ethereum/go-ethereum"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"last_affected": "1.10.12"
}
],
"type": "ECOSYSTEM"
}
]
}
],
"aliases": [
"CVE-2022-23327"
],
"database_specific": {
"cwe_ids": [
"CWE-400"
],
"github_reviewed": true,
"github_reviewed_at": "2022-03-09T19:20:04Z",
"nvd_published_at": "2022-03-04T12:15:00Z",
"severity": "HIGH"
},
"details": "A design flaw in Go-Ethereum 1.10.12 and older versions allows an attacker node to send 5120 future transactions with a high gas price in one message, which can purge all of pending transactions in a victim node\u0027s memory pool, causing a denial of service (DoS).",
"id": "GHSA-pvx3-gm3c-gmpr",
"modified": "2022-03-18T20:06:42Z",
"published": "2022-03-05T00:00:46Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2022-23327"
},
{
"type": "WEB",
"url": "https://dl.acm.org/doi/pdf/10.1145/3460120.3485369"
},
{
"type": "PACKAGE",
"url": "https://github.com/ethereum/go-ethereum"
},
{
"type": "WEB",
"url": "https://tristartom.github.io/docs/ccs21.pdf"
}
],
"schema_version": "1.4.0",
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
"type": "CVSS_V3"
}
],
"summary": "Denial of Service in Go-Ethereum"
}
GHSA-PW4V-GR34-2553
Vulnerability from github – Published: 2021-04-16 19:53 – Updated: 2024-09-24 15:42Impact
Missing input validation of some parameters on the endpoints used to confirm third-party identifiers could cause excessive use of disk space and memory leading to resource exhaustion.
Patches
Fixed by 3175fd3.
For more information
If you have any questions or comments about this advisory, email us at security@matrix.org.
{
"affected": [
{
"package": {
"ecosystem": "PyPI",
"name": "matrix-sydent"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "2.3.0"
}
],
"type": "ECOSYSTEM"
}
]
}
],
"aliases": [
"CVE-2021-29433"
],
"database_specific": {
"cwe_ids": [
"CWE-20",
"CWE-400"
],
"github_reviewed": true,
"github_reviewed_at": "2021-04-15T18:45:07Z",
"nvd_published_at": "2021-04-15T18:15:00Z",
"severity": "MODERATE"
},
"details": "### Impact\n\nMissing input validation of some parameters on the endpoints used to confirm third-party identifiers could cause excessive use of disk space and memory leading to resource exhaustion.\n\n### Patches\n\nFixed by 3175fd3.\n\n### For more information\n\nIf you have any questions or comments about this advisory, email us at security@matrix.org.",
"id": "GHSA-pw4v-gr34-2553",
"modified": "2024-09-24T15:42:42Z",
"published": "2021-04-16T19:53:37Z",
"references": [
{
"type": "WEB",
"url": "https://github.com/matrix-org/sydent/security/advisories/GHSA-pw4v-gr34-2553"
},
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2021-29433"
},
{
"type": "WEB",
"url": "https://github.com/matrix-org/sydent/commit/3175fd358ebc2c310eab7a3dbf296ce2bd54c1da"
},
{
"type": "PACKAGE",
"url": "https://github.com/matrix-org/sydent"
},
{
"type": "WEB",
"url": "https://github.com/pypa/advisory-database/tree/main/vulns/matrix-sydent/PYSEC-2021-24.yaml"
},
{
"type": "WEB",
"url": "https://pypi.org/project/matrix-sydent"
}
],
"schema_version": "1.4.0",
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L",
"type": "CVSS_V3"
},
{
"score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N",
"type": "CVSS_V4"
}
],
"summary": "Sydent DoS (via resource exhaustion) due to improper input validation"
}
GHSA-PW54-MH39-W3HC
Vulnerability from github – Published: 2021-05-10 19:08 – Updated: 2021-04-20 17:21This affects the package npm-user-validate before 1.0.1. The regex that validates user emails took exponentially longer to process long input strings beginning with @ characters.
{
"affected": [
{
"package": {
"ecosystem": "npm",
"name": "npm-user-validate"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "1.0.1"
}
],
"type": "ECOSYSTEM"
}
]
}
],
"aliases": [
"CVE-2020-7754"
],
"database_specific": {
"cwe_ids": [
"CWE-400"
],
"github_reviewed": true,
"github_reviewed_at": "2021-04-20T17:21:44Z",
"nvd_published_at": "2020-10-27T15:15:00Z",
"severity": "HIGH"
},
"details": "This affects the package npm-user-validate before 1.0.1. The regex that validates user emails took exponentially longer to process long input strings beginning with @ characters.",
"id": "GHSA-pw54-mh39-w3hc",
"modified": "2021-04-20T17:21:44Z",
"published": "2021-05-10T19:08:15Z",
"references": [
{
"type": "WEB",
"url": "https://github.com/npm/npm-user-validate/security/advisories/GHSA-xgh6-85xh-479p"
},
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2020-7754"
},
{
"type": "WEB",
"url": "https://github.com/npm/npm-user-validate/commit/c8a87dac1a4cc6988b5418f30411a8669bef204e"
},
{
"type": "WEB",
"url": "https://snyk.io/vuln/SNYK-JAVA-ORGWEBJARSNPM-1019353"
},
{
"type": "WEB",
"url": "https://snyk.io/vuln/SNYK-JS-NPMUSERVALIDATE-1019352"
}
],
"schema_version": "1.4.0",
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
"type": "CVSS_V3"
}
],
"summary": "Regular expression denial of service in npm-user-validate"
}
GHSA-PW65-258F-V77H
Vulnerability from github – Published: 2024-03-08 03:31 – Updated: 2026-04-02 21:31A memory corruption vulnerability was addressed with improved locking. This issue is fixed in macOS Monterey 12.7.4, macOS Ventura 13.6.5, macOS Sonoma 14.4, visionOS 1.1, iOS 17.4 and iPadOS 17.4, watchOS 10.4, iOS 16.7.6 and iPadOS 16.7.6, tvOS 17.4. An app may be able to cause unexpected system termination or write kernel memory.
{
"affected": [],
"aliases": [
"CVE-2024-23265"
],
"database_specific": {
"cwe_ids": [
"CWE-400",
"CWE-787"
],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2024-03-08T02:15:49Z",
"severity": "CRITICAL"
},
"details": "A memory corruption vulnerability was addressed with improved locking. This issue is fixed in macOS Monterey 12.7.4, macOS Ventura 13.6.5, macOS Sonoma 14.4, visionOS 1.1, iOS 17.4 and iPadOS 17.4, watchOS 10.4, iOS 16.7.6 and iPadOS 16.7.6, tvOS 17.4. An app may be able to cause unexpected system termination or write kernel memory.",
"id": "GHSA-pw65-258f-v77h",
"modified": "2026-04-02T21:31:38Z",
"published": "2024-03-08T03:31:25Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2024-23265"
},
{
"type": "WEB",
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{
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"url": "http://seclists.org/fulldisclosure/2024/Mar/21"
},
{
"type": "WEB",
"url": "http://seclists.org/fulldisclosure/2024/Mar/22"
},
{
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"url": "http://seclists.org/fulldisclosure/2024/Mar/23"
},
{
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"url": "http://seclists.org/fulldisclosure/2024/Mar/24"
},
{
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},
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],
"schema_version": "1.4.0",
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
"type": "CVSS_V3"
}
]
}
Mitigation
Design throttling mechanisms into the system architecture. The best protection is to limit the amount of resources that an unauthorized user can cause to be expended. A strong authentication and access control model will help prevent such attacks from occurring in the first place. The login application should be protected against DoS attacks as much as possible. Limiting the database access, perhaps by caching result sets, can help minimize the resources expended. To further limit the potential for a DoS attack, consider tracking the rate of requests received from users and blocking requests that exceed a defined rate threshold.
Mitigation
- Mitigation of resource exhaustion attacks requires that the target system either:
- The first of these solutions is an issue in itself though, since it may allow attackers to prevent the use of the system by a particular valid user. If the attacker impersonates the valid user, they may be able to prevent the user from accessing the server in question.
- The second solution is simply difficult to effectively institute -- and even when properly done, it does not provide a full solution. It simply makes the attack require more resources on the part of the attacker.
- recognizes the attack and denies that user further access for a given amount of time, or
- uniformly throttles all requests in order to make it more difficult to consume resources more quickly than they can again be freed.
Mitigation
Ensure that protocols have specific limits of scale placed on them.
Mitigation
Ensure that all failures in resource allocation place the system into a safe posture.
CAPEC-147: XML Ping of the Death
An attacker initiates a resource depletion attack where a large number of small XML messages are delivered at a sufficiently rapid rate to cause a denial of service or crash of the target. Transactions such as repetitive SOAP transactions can deplete resources faster than a simple flooding attack because of the additional resources used by the SOAP protocol and the resources necessary to process SOAP messages. The transactions used are immaterial as long as they cause resource utilization on the target. In other words, this is a normal flooding attack augmented by using messages that will require extra processing on the target.
CAPEC-227: Sustained Client Engagement
An adversary attempts to deny legitimate users access to a resource by continually engaging a specific resource in an attempt to keep the resource tied up as long as possible. The adversary's primary goal is not to crash or flood the target, which would alert defenders; rather it is to repeatedly perform actions or abuse algorithmic flaws such that a given resource is tied up and not available to a legitimate user. By carefully crafting a requests that keep the resource engaged through what is seemingly benign requests, legitimate users are limited or completely denied access to the resource.
CAPEC-492: Regular Expression Exponential Blowup
An adversary may execute an attack on a program that uses a poor Regular Expression(Regex) implementation by choosing input that results in an extreme situation for the Regex. A typical extreme situation operates at exponential time compared to the input size. This is due to most implementations using a Nondeterministic Finite Automaton(NFA) state machine to be built by the Regex algorithm since NFA allows backtracking and thus more complex regular expressions.