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FreeBSD : libXcursor -- integer overflow that can lead to heap buffer overflow (ddecde18-e33b-11e7-a293-54e1ad3d6335)

high Nessus Plugin ID 105339

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Synopsis

The remote FreeBSD host is missing a security-related update.

Description

The freedesktop.org project reports :

It is possible to trigger heap overflows due to an integer overflow while parsing images and a signedness issue while parsing comments.

The integer overflow occurs because the chosen limit 0x10000 for dimensions is too large for 32 bit systems, because each pixel takes 4 bytes. Properly chosen values allow an overflow which in turn will lead to less allocated memory than needed for subsequent reads.

The signedness bug is triggered by reading the length of a comment as unsigned int, but casting it to int when calling the function XcursorCommentCreate. Turning length into a negative value allows the check against XCURSOR_COMMENT_MAX_LEN to pass, and the following addition of sizeof (XcursorComment) + 1 makes it possible to allocate less memory than needed for subsequent reads.

Solution

Update the affected package.

See Also

https://seclists.org/oss-sec/2017/q4/339

http://www.nessus.org/u?7f2255c6

http://www.nessus.org/u?48058243

Plugin Details

Severity: High

ID: 105339

File Name: freebsd_pkg_ddecde18e33b11e7a29354e1ad3d6335.nasl

Version: 3.5

Type: local

Published: 12/18/2017

Updated: 1/4/2021

Supported Sensors: Nessus

Risk Information

VPR

Risk Factor: Medium

Score: 4.4

CVSS v2

Risk Factor: Medium

Base Score: 5

Vector: CVSS2#AV:N/AC:L/Au:N/C:N/I:N/A:P

CVSS v3

Risk Factor: High

Base Score: 7.5

Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Vulnerability Information

CPE: p-cpe:/a:freebsd:freebsd:libxcursor, cpe:/o:freebsd:freebsd

Required KB Items: Host/local_checks_enabled, Host/FreeBSD/release, Host/FreeBSD/pkg_info

Patch Publication Date: 12/17/2017

Vulnerability Publication Date: 11/28/2017

Reference Information

CVE: CVE-2017-16612