secure-code-warrior-for-github[bot]
commented
1 year ago Micro-Learning Topic: Denial of service (Detected by phrase)
Matched on "denial of service"
The Denial of Service (DoS) attack is focused on making a resource (site, application, server) unavailable for the purpose it was designed. There are many ways to make a service unavailable for legitimate users by manipulating network packets, programming, logical, or resources handling vulnerabilities, among others. Source: https://www.owasp.org/index.php/Denial_of_Service
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Micro-Learning Topic: Resource exhaustion (Detected by phrase)
Matched on "resource exhaustion"
Allocating objects or timers with user-controlled sizes or durations can cause resource exhaustion.
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Micro-Learning Topic: Vulnerable library (Detected by phrase)
Matched on "Vulnerable Library"
Use of vulnerable components will introduce weaknesses into the application. Components with published vulnerabilities will allow easy exploitation as resources will often be available to automate the process.
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Denial of Service on the main website for The OWASP Foundation. OWASP is a nonprofit foundation that works to improve the security of software.
CVE-2023-26485 - High Severity Vulnerability
A fast, safe, extensible parser for CommonMark. This wraps the official libcmark library.
Library home page: https://rubygems.org/gems/commonmarker-0.17.13.gem
Dependency Hierarchy: - github-pages-207.gem (Root Library) - jekyll-commonmark-ghpages-0.1.6.gem - :x: **commonmarker-0.17.13.gem** (Vulnerable Library)
Found in base branch: main
cmark-gfm is GitHub's fork of cmark, a CommonMark parsing and rendering library and program in C. A polynomial time complexity issue in cmark-gfm may lead to unbounded resource exhaustion and subsequent denial of service. This CVE covers quadratic complexity issues when parsing text which leads with either large numbers of `_` characters. This issue has been addressed in version 0.29.0.gfm.10. Users are advised to upgrade. Users unable to upgrade should validate that their input comes from trusted sources. ### Impact A polynomial time complexity issue in cmark-gfm may lead to unbounded resource exhaustion and subsequent denial of service. ### Proof of concept ``` $ ~/cmark-gfm$ python3 -c 'pad = "_" * 100000; print(pad + "." + pad, end="")' | time ./build/src/cmark-gfm --to plaintext ``` Increasing the number 10000 in the above commands causes the running time to increase quadratically. ### Patches This vulnerability have been patched in 0.29.0.gfm.10. ### Note on cmark and cmark-gfm XXX: TBD [cmark-gfm](https://github.com/github/cmark-gfm) is a fork of [cmark](https://github.com/commonmark/cmark) that adds the GitHub Flavored Markdown extensions. The two codebases have diverged over time, but share a common core. These bugs affect both `cmark` and `cmark-gfm`. ### Credit We would like to thank @gravypod for reporting this vulnerability. ### References https://en.wikipedia.org/wiki/Time_complexity ### For more information If you have any questions or comments about this advisory: * Open an issue in [github/cmark-gfm](https://github.com/github/cmark-gfm)
Publish Date: 2023-03-31
URL: CVE-2023-26485
Base Score Metrics: - Exploitability Metrics: - Attack Vector: Network - Attack Complexity: Low - Privileges Required: None - User Interaction: None - Scope: Unchanged - Impact Metrics: - Confidentiality Impact: None - Integrity Impact: None - Availability Impact: High
For more information on CVSS3 Scores, click here.Type: Upgrade version
Origin: https://github.com/advisories/GHSA-48wp-p9qv-4j64
Release Date: 2023-03-31
Fix Resolution: commonmarker - 0.23.9
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