Advisory details:
gitlab / maven/org.apache.logging.log4j/log4j/CVE-2021-45046
| Advisory ID | gitlab/maven/org.apache.logging.log4j/log4j/CVE-2021-45046 |
| Aliases |
CVE-2021-45046
|
| Summary | Improper Neutralization of Special Elements in Output Used by a Downstream Component ('Injection') It was found that the fix to address CVE-2021-44228 in Apache Log4j was incomplete in certain non-default configurations. This could allows attackers with control over Thread Context Map (MDC) input data when the logging configuration uses a non-default Pattern Layout with either a Context Lookup (for example, `$${ctx:loginId})` or a Thread Context Map pattern (`%X`, `%mdc`, or `%MDC`) to craft malicious input data using a JNDI Lookup pattern resulting in a denial of service (DOS) attack. Log4j restricts JNDI LDAP lookups to localhost by default. Note that previous mitigations involving configuration such as to set the system property `log4j2.noFormatMsgLookup` to `true` do NOT mitigate this specific vulnerability. Log4j fixes this issue by removing support for message lookup patterns and disabling JNDI functionality by default. |
| Status | Published |
| Exploitability | 2.0 |
| Weighted Severity | 0.0 |
| Risk | |
| Affected and Fixed Packages | Package Details |
| Introduced and Fixed Package Commit Patches | Package Commit Patches Details |
| Reference id | Reference type | URL |
|---|---|---|
| 4 | Mailing List | http://www.openwall.com/lists/oss-security/2021/12/14/4 |
| CVE-2021-45046 | https://nvd.nist.gov/vuln/detail/CVE-2021-45046 | |
| security.html | Other | https://logging.apache.org/log4j/2.x/security.html |
| Data source | Metasploit |
|---|---|
| Description | Versions of Apache Log4j2 impacted by CVE-2021-44228 which allow JNDI features used in configuration, log messages, and parameters, do not protect against attacker controlled LDAP and other JNDI related endpoints. This module will scan an HTTP end point for the Log4Shell vulnerability by injecting a format message that will trigger an LDAP connection to Metasploit. This module is a generic scanner and is only capable of identifying instances that are vulnerable via one of the pre-determined HTTP request injection points. These points include HTTP headers and the HTTP request path. Known impacted software includes Apache Struts 2, VMWare VCenter, Apache James, Apache Solr, Apache Druid, Apache JSPWiki, Apache OFBiz. |
| Note | Stability: - crash-safe SideEffects: - ioc-in-logs AKA: - Log4Shell - LogJam Reliability: [] |
| Ransomware campaign use | Unknown |
| Source publication date | Dec. 9, 2021 |
| Source URL | https://github.com/rapid7/metasploit-framework/tree/master/modules/auxiliary/scanner/http/log4shell_scanner.rb |
| Data source | KEV |
|---|---|
| Date added | May 1, 2023 |
| Description | Apache Log4j2 contains a deserialization of untrusted data vulnerability due to the incomplete fix of CVE-2021-44228, where the Thread Context Lookup Pattern is vulnerable to remote code execution in certain non-default configurations. |
| Required action | Apply updates per vendor instructions. |
| Due date | May 22, 2023 |
| Note | https://logging.apache.org/log4j/2.x/security.html; https://nvd.nist.gov/vuln/detail/CVE-2021-45046 |
| Ransomware campaign use | Known |
No EPSS data available for this advisory.
| Patch URL | |
|---|---|
| There are no known patches. | |
| Exploitability (E) | Access Vector (AV) | Access Complexity (AC) | Authentication (Au) | Confidentiality Impact (C) | Integrity Impact (I) | Availability Impact (A) |
|---|---|---|---|---|---|---|
high functional unproven proof_of_concept not_defined |
local adjacent_network network |
high medium low |
multiple single none |
none partial complete |
none partial complete |
none partial complete |
| Attack Vector (AV) | Attack Complexity (AC) | Privileges Required (PR) | User Interaction (UI) | Scope (S) | Confidentiality Impact (C) | Integrity Impact (I) | Availability Impact (A) |
|---|---|---|---|---|---|---|---|
network adjacent_network local physical |
low high |
none low high |
none required |
unchanged changed |
high low none |
high low none |
high low none |
Vector: SSVCv2/E:A/A:N/T:T/P:M/B:A/M:M/D:A/2025-02-04T19:31:22Z/
Decision: Attend
Source URL: https://github.com/cisagov/vulnrichment/blob/develop/2021/45xxx/CVE-2021-45046.json
Source Advisory: vulnrichment/CVE-2021-45046
[{'Exploitation': 'active'},
{'Automatable': 'no'},
{'Technical Impact': 'total'},
{'Mission Prevalence': 'minimal'},
{'Public Well-being Impact': 'material'},
{'Mission & Well-being': 'medium'}]