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.

The version of flex installed on the remote CBL Mariner 2.0 host is prior to tested version. It is, therefore, affected by a vulnerability as referenced in the CVE-2019-6293 advisory.

  - 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. (CVE-2019-6293)

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

The remote Redhat Enterprise Linux 8 host has one or more packages installed that are affected by a vulnerability that has been acknowledged by the vendor but will not be patched.

  - flex: Recursive calls in the function mark_beginning_as_normal resulting in a denial of service     (CVE-2019-6293)

Note that Nessus has not tested for this issue but has instead relied on the package manager's report that the package is installed.

The remote Redhat Enterprise Linux 7 host has one or more packages installed that are affected by multiple vulnerabilities that have been acknowledged by the vendor but will not be patched.

  - flex: buffer overflow in generated code (yy_get_next_buffer) (CVE-2016-6354)

  - 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. (CVE-2019-6293)

Note that Nessus has not tested for these issues but has instead relied on the package manager's report that the package is installed.

This plugin has been deprecated as it does not adhere to established standards for this style of check.

ID	Name	Product	Family	Severity
201584	CBL Mariner 2.0 Security Update: flex (CVE-2019-6293)	Nessus	MarinerOS Local Security Checks	medium
199060	RHEL 8 : flex (Unpatched Vulnerability)	Nessus	Red Hat Local Security Checks	medium
199001	RHEL 7 : flex (Unpatched Vulnerability)	Nessus	Red Hat Local Security Checks	critical
196431	RHEL 5 : flex (Unpatched Vulnerability) (deprecated)	Nessus	Red Hat Local Security Checks	medium
196397	RHEL 6 : flex (Unpatched Vulnerability) (deprecated)	Nessus	Red Hat Local Security Checks	medium

Detections

Analytics

CVE-2019-6293

medium

Tenable Plugins

medium

medium

critical

medium

medium