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flex: Recursive calls in the function mark_beginning_as_normal resulting in a denial of service

Published Jan 15, 2019

Description

An issue was discovered in the function mark_beginning_as_normal in nfa.c in flex 2.6.4. There is a stack exhaustion problem caused by the mark_beginning_as_normal function making recursive calls to itself in certain scenarios involving lots of '*' characters. Remote attackers could leverage this vulnerability to cause a denial-of-service.

Affected products

Remediation

Red Hat statement

This issue affects the versions of flex as shipped with Red Hat Enterprise Linux 5, 6, 7, and 8. Red Hat Enterprise Linux 5 is now in Extended Life Phase of the support and maintenance life cycle. This issue is not currently planned to be addressed in future updates. For additional information, refer to the Red Hat Enterprise Linux Life Cycle: https://access.redhat.com/support/policy/updates/errata/. Red Hat Enterprise Linux 6 is now in Maintenance Support 2 Phase of the support and maintenance life cycle. This has been rated as having a security impact of Low, and is not currently planned to be addressed in future updates. For additional information, refer to the Red Hat Enterprise Linux Life Cycle: https://access.redhat.com/support/policy/updates/errata/.

Metrics

Weaknesses (2)

CWE-400

Uncontrolled Resource Consumption

CWE-674

References (5)

Change history (0)

No recorded changes yet.

Sources
CVE.org / MITRE
Status PUBLISHED
Assigner mitre
Published Jan 15, 2019
Updated Sep 16, 2024
Reserved Jan 14, 2019
Link CVE-2019-6293
CISA Vulnrichment
Updated n/a
NVD
Status Modified
Modified Jun 17, 2026
Link CVE-2019-6293
Red Hat
Severity Low
Public date Jan 9, 2019
Links CVE-2019-6293 - Bugzilla