w3m through 0.5.3 is prone to a NULL pointer dereference flaw in formUpdateBuffer in form.c.

The remote Redhat Enterprise Linux 5 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.

  - w3m: Out-of-bounds write in addMultirowsForm() (CVE-2016-9428)

  - An issue was discovered in the Tatsuya Kinoshita w3m fork before 0.5.3-31. The feed_table_tag function in     w3m doesn't properly validate the value of table span, which allows remote attackers to cause a denial of     service (stack and/or heap buffer overflow) and possibly execute arbitrary code via a crafted HTML page.
    (CVE-2016-9422)

  - An issue was discovered in the Tatsuya Kinoshita w3m fork before 0.5.3-31. w3m doesn't properly validate     the value of tag attribute, which allows remote attackers to cause a denial of service (heap buffer     overflow crash) and possibly execute arbitrary code via a crafted HTML page. (CVE-2016-9424)

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

The remote Redhat Enterprise Linux 6 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.

  - w3m: Heap corruption due to integer overflow in renderTable() (CVE-2016-9426)

  - An issue was discovered in the Tatsuya Kinoshita w3m fork before 0.5.3-31. The feed_table_tag function in     w3m doesn't properly validate the value of table span, which allows remote attackers to cause a denial of     service (stack and/or heap buffer overflow) and possibly execute arbitrary code via a crafted HTML page.
    (CVE-2016-9422)

  - An issue was discovered in the Tatsuya Kinoshita w3m fork before 0.5.3-31. w3m doesn't properly validate     the value of tag attribute, which allows remote attackers to cause a denial of service (heap buffer     overflow crash) and possibly execute arbitrary code via a crafted HTML page. (CVE-2016-9424)

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

Two issues have been found in w3m, WWW browsable pager with excellent tables/frames support.

One issue is related to a stack overflow, the other one is a fix for a NULL pointer dereference.

Brief introduction

CVE-2018-6196

Description

CVE-2018-6197

Description

For Debian 8 'Jessie', these problems have been fixed in version 0.5.3-19+deb8u3.

We recommend that you upgrade your w3m packages.

NOTE: Tenable Network Security has extracted the preceding description block directly from the DLA security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

This update for w3m fixes the following issues :

Security issues fixed :

  - CVE-2018-6196: Prevent infinite recursion in     HTMLlineproc0 caused by the feed_table_block_tag     function which did not prevent a negative indent value     (bsc#1077559)

  - CVE-2018-6197: Prevent NULL pointer dereference in     formUpdateBuffer (bsc#1077568)

  - CVE-2018-6198: w3m did not properly handle temporary     files when the ~/.w3m directory is unwritable, which     allowed a local attacker to craft a symlink attack to     overwrite arbitrary files (bsc#1077572)

This update was imported from the SUSE:SLE-12:Update update project.

This update for w3m fixes several issues.

These security issues were fixed :

CVE-2018-6196: Prevent infinite recursion in HTMLlineproc0 caused by the feed_table_block_tag function which did not prevent a negative indent value (bsc#1077559)

CVE-2018-6197: Prevent NULL pointer dereference in formUpdateBuffer (bsc#1077568)

CVE-2018-6198: w3m did not properly handle temporary files when the ~/.w3m directory is unwritable, which allowed a local attacker to craft a symlink attack to overwrite arbitrary files (bsc#1077572)

Note that Tenable Network Security has extracted the preceding description block directly from the SUSE security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

Rebase to latest upstream gitrev 20180125 and Security fix for CVE-2018-6196, CVE-2018-6197, CVE-2018-6198

Note that Tenable Network Security has extracted the preceding description block directly from the Fedora update system website.
Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

Tatsuya Kinoshita reports :

CVE-2018-6196 * table.c: Prevent negative indent value in feed_table_block_tag().

CVE-2018-6197 * form.c: Prevent invalid columnPos() call in formUpdateBuffer().

CVE-2018-6198 * config.h.dist, config.h.in, configure, configure.ac, main.c, rc.c: Make temporary directory safely when ~/.w3m is unwritable.

It was discovered that w3m incorrectly handled certain inputs. An attacker could possibly use this to cause a denial of service.
(CVE-2018-6196, CVE-2018-6197)

It was discovered that w3m incorrectly handled temporary files. An attacker could possibly use this to overwrite arbitrary files.
(CVE-2018-6198).

Note that Tenable Network Security has extracted the preceding description block directly from the Ubuntu security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

ID	Name	Product	Family	Severity
199906	RHEL 5 : w3m (Unpatched Vulnerability)	Nessus	Red Hat Local Security Checks	high
199853	RHEL 6 : w3m (Unpatched Vulnerability)	Nessus	Red Hat Local Security Checks	high
136204	Debian DLA-2195-1 : w3m security update	Nessus	Debian Local Security Checks	high
123772	openSUSE Security Update : w3m (openSUSE-2019-1142)	Nessus	SuSE Local Security Checks	medium
123450	SUSE SLED12 / SLES12 Security Update : w3m (SUSE-SU-2019:0776-1)	Nessus	SuSE Local Security Checks	medium
106698	Fedora 27 : w3m (2018-0ad6e73ac0)	Nessus	Fedora Local Security Checks	high
106600	FreeBSD : w3m - multiple vulnerabilities (e72d5bf5-07a0-11e8-8248-0021ccb9e74d)	Nessus	FreeBSD Local Security Checks	high
106581	Ubuntu 14.04 LTS / 16.04 LTS : w3m vulnerabilities (USN-3555-1)	Nessus	Ubuntu Local Security Checks	medium

Detections

Analytics

CVE-2018-6197

high

Tenable Plugins

high

high

high

medium

medium

high

high

medium