Process crash via recursive compression pointer
Published Mar 24, 2020 · Updated Aug 4, 2024
Uncontrolled recursion in Videolabs libmicrodns 0.1.0 allows remote attackers to crash an mDNS-using process via a crafted message. The rr_decode function recursively follows compression pointers without detecting a self-reference, so a label that points to itself exhausts the program stack. The process must be using the library to receive attacker-controlled mDNS traffic; exploitation interrupts only that process.
Summary
What happened
Uncontrolled recursion in Videolabs libmicrodns 0.1.0 allows remote attackers to crash an mDNS-using process via a crafted message. The rr_decode function recursively follows compression pointers without detecting a self-reference, so a label that points to itself exhausts the program stack. The process must be using the library to receive attacker-controlled mDNS traffic; exploitation interrupts only that process.
The record
- CVE
- CVE-2020-6071
- Published
- Mar 24, 2020
- Updated
- Aug 4, 2024
- Vendor
- Videolabs
- Product
- libmicrodns
- Classifications
- CWE-674, T1499
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Mar 24, 2020CVE publishedPublication date reported by the CVE source.
- Aug 4, 2024Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=Videolabs libmicrodns 0.1.0
What conditions does exploitation require?
What is affected?
Published CVSS scores
CVSS describes severity. EPSS estimates exploitation probability.
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Public exploit references
- Self-referential mDNS label trigger descriptionproof of concept · demonstrated
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Technologies
Your stack
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Your stack
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