CVE-2021-27186 : Fluent Bit 1.6.10 has a NULL pointer dereference when an flb

Fluent Bit 1.6.10 has a NULL pointer dereference when an flb_malloc return value is not validated by flb_avro.c or http_server/api/v1/metrics.c.

Published 2021-02-10 22:15:14

Updated 2021-02-16 20:42:39

Source MITRE

View at NVD, CVE.org

Vulnerability category: Memory Corruption

Products affected by CVE-2021-27186

Treasuredata » Fluent Bit » Version: 1.6.10
cpe:2.3:a:treasuredata:fluent_bit:1.6.10:*:*:*:*:*:*:*
Matching versions

EPSS FAQ

0.29%

Probability of exploitation activity in the next 30 days EPSS Score History

~ 69 %

Percentile, the proportion of vulnerabilities that are scored at or less

Base Score	Base Severity	CVSS Vector	Exploitability Score	Impact Score	Score Source
5.0	MEDIUM	AV:N/AC:L/Au:N/C:N/I:N/A:P	10.0	2.9	NIST
Access Vector: Network Access Complexity: Low Authentication: None Confidentiality Impact: None Integrity Impact: None Availability Impact: Partial
7.5	HIGH	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H	3.9	3.6	NIST
Attack Vector: Network Attack Complexity: Low Privileges Required: None User Interaction: None Scope: Unchanged Confidentiality: None Integrity: None Availability: High

CWE-476 NULL Pointer Dereference

The product dereferences a pointer that it expects to be valid but is NULL.

Assigned by: nvd@nist.gov (Primary)

https://github.com/fluent/fluent-bit/pull/3045

Add additional check returned from flb_malloc by yongtang · Pull Request #3045 · fluent/fluent-bit · GitHub
Exploit;Patch;Third Party Advisory
https://github.com/fluent/fluent-bit/pull/3047

http_server: v1: metrics: fix potential SIGSEGV by memory allocation errors by yongtang · Pull Request #3047 · fluent/fluent-bit · GitHub
Patch;Third Party Advisory
https://github.com/fluent/fluent-bit/issues/3044

NULL dereference on memory allocation error (src/ flb_avro) · Issue #3044 · fluent/fluent-bit · GitHub
Exploit;Third Party Advisory

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