Memory Leak in ISC BIND via Malformed ECDSA Signatures
CVE-2022-38177 Published on September 21, 2022
Memory leak in ECDSA DNSSEC verification code
By spoofing the target resolver with responses that have a malformed ECDSA signature, an attacker can trigger a small memory leak. It is possible to gradually erode available memory to the point where named crashes for lack of resources.
Vulnerability Analysis
CVE-2022-38177 can be exploited with network access, and does not require authorization privileges or user interaction. This vulnerability is considered to have a low attack complexity. The potential impact of an exploit of this vulnerability is considered to have no impact on confidentiality and integrity, and a high impact on availability.
Weakness Type
What is a Memory Leak Vulnerability?
The software does not sufficiently track and release allocated memory after it has been used, which slowly consumes remaining memory. This is often triggered by improper handling of malformed data or unexpectedly interrupted sessions. In some languages, developers are responsible for tracking memory allocation and releasing the memory. If there are no more pointers or references to the memory, then it can no longer be tracked and identified for release.
CVE-2022-38177 has been classified to as a Memory Leak vulnerability or weakness.
Products Associated with CVE-2022-38177
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Affected Versions
ISC BIND9:- Version Open Source Branches 9.8 through 9.16 9.8.4 through versions before 9.16.33 is affected.
- Version Supported Preview Branches 9.9-S through 9.11-S 9.9.4-S1 through versions up to and including 9.11.37-S1 is affected.
- Version Supported Preview Branch 9.16-S 9.16.8-S1 through versions before 9.16.33-S1 is affected.
Exploit Probability
EPSS (Exploit Prediction Scoring System) scores estimate the probability that a vulnerability will be exploited in the wild within the next 30 days. The percentile shows you how this score compares to all other vulnerabilities.