PT-2021-17305 · Unknown · Fluent-Bit

Yong Tang + 1 · Published 2021-02-10 · Updated 2024-03-06 · CVE-2021-27186

Positive Technologies (AI Summary)

CVSS v3.1

7.5

High

Base vector

AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Name of the Vulnerable Software and Affected Versions: Fluent Bit version 1.6.10

Description: The issue is related to a NULL pointer dereference that occurs when the return value of flb malloc is not validated by flb avro.c or http server/api/v1/metrics.c. This can lead to a crash or potentially allow an attacker to execute arbitrary code. The http server/api/v1/metrics.c file is specifically mentioned as a vulnerable component, with the /api/v1/metrics endpoint being a point of interest.

Recommendations: For Fluent Bit version 1.6.10, consider disabling the flb avro.c and http server/api/v1/metrics.c components until a patch is available. Restrict access to the /api/v1/metrics endpoint to minimize the risk of exploitation. At the moment, there is no information about a newer version that contains a fix for this vulnerability.

Exploit

NULL Pointer Dereference

Weakness Enumeration

CWE-476

Related Identifiers

BIT-FLUENT-BIT-2021-27186

CVE-2021-27186

Affected Products

Fluent-Bit

References · 8

• 🔥 https://github.com/fluent/fluent-bit/pull/3045 · Exploit
• 🔥 https://github.com/fluent/fluent-bit/issues/3044 · Exploit
• https://github.com/fluent/fluent-bit/pull/3047 · Patch
• https://nvd.nist.gov/vuln/detail/CVE-2021-27186 · Security Note
• https://osv.dev/vulnerability/CVE-2021-27186 · Vendor Advisory
• https://osv.dev/vulnerability/BIT-fluent-bit-2021-27186 · Vendor Advisory
• https://t.me/cvenotify/9761 · Telegram Post
• https://t.me/cibsecurity/23416 · Telegram Post