GLSA-201701-31 : flex: Potential insecure code generation

This script is Copyright (C) 2017 Tenable Network Security, Inc.


Synopsis :

The remote Gentoo host is missing one or more security-related
patches.

Description :

The remote host is affected by the vulnerability described in GLSA-201701-31
(flex: Potential insecure code generation)

A heap-based buffer overflow in the yy_get_next_buffer function in Flex
might allow context-dependent attackers to cause a denial of service or
possibly execute arbitrary code via vectors involving num_to_read.

Impact :

Context-dependent attackers could cause a Denial of Service condition or
possibly execute arbitrary code with the privileges of the process.

Workaround :

There is no known workaround at this time.

See also :

https://security.gentoo.org/glsa/201701-31

Solution :

All flex users should upgrade to the latest version:
# emerge --sync
# emerge --ask --oneshot --verbose '>=sys-devel/flex-2.6.1'
Packages which depend on flex may need to be recompiled. Tools such as
qdepends (included in app-portage/portage-utils) may assist in
identifying these packages:
# emerge --oneshot --ask --verbose $(qdepends -CQ sys-devel/flex | sed
's/^/=/')

Risk factor :

High / CVSS Base Score : 7.5
(CVSS2#AV:N/AC:L/Au:N/C:P/I:P/A:P)

Family: Gentoo Local Security Checks

Nessus Plugin ID: 96425 ()

Bugtraq ID:

CVE ID: CVE-2016-6354

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