Log4j 1.x Chainsaw/SocketAppender DoS via hashmap deserialization on JRE<1.7
CVE-2023-26464 Published on March 10, 2023
Apache Log4j 1.x (EOL) allows DoS in Chainsaw and SocketAppender
** UNSUPPORTED WHEN ASSIGNED **
When using the Chainsaw or SocketAppender components with Log4j 1.x on JRE less than 1.7, an attacker that manages to cause a logging entry involving a specially-crafted (ie, deeply nested)
hashmap or hashtable (depending on which logging component is in use) to be processed could exhaust the available memory in the virtual machine and achieve Denial of Service when the object is deserialized.
This issue affects Apache Log4j before 2. Affected users are recommended to update to Log4j 2.x.
NOTE: This vulnerability only affects products that are no longer supported by the maintainer.
Vulnerability Analysis
CVE-2023-26464 is exploitable 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 Marshaling, Unmarshaling Vulnerability?
The application deserializes untrusted data without sufficiently verifying that the resulting data will be valid.
CVE-2023-26464 has been classified to as a Marshaling, Unmarshaling vulnerability or weakness.
Products Associated with CVE-2023-26464
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Affected Versions
Apache Software Foundation Apache Log4j:- Version 1.0.4 and below 2 is affected.
- Version 2, <= * is unaffected.
- Version 1.0.4 and below 2.0 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.