libXcursor (SSA:2017-333-01)
From: Slackware Security Team <>
Subject: [slackware-security] libXcursor (SSA:2017-333-01)
Date: Wed, 29 Nov 2017 00:19:08 -0800 (PST)

Hash: SHA1

[slackware-security] libXcursor (SSA:2017-333-01)

New libXcursor packages are available for Slackware 13.0, 13.1, 13.37, 14.0,
14.1, 14.2, and -current to fix a security issue.

Here are the details from the Slackware 14.2 ChangeLog:
patches/packages/libXcursor-1.1.15-i586-1_slack14.2.txz: Upgraded.
Fix heap overflows when parsing malicious files. (CVE-2017-16612)
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.
For more information, see:
(* Security fix *)

Where to find the new packages:

Thanks to the friendly folks at the OSU Open Source Lab
( for donating FTP and rsync hosting
to the Slackware project! :-)

Also see the "Get Slack" section on for
additional mirror sites near you.

Updated package for Slackware 13.0:

Updated package for Slackware x86_64 13.0:

Updated package for Slackware 13.1:

Updated package for Slackware x86_64 13.1:

Updated package for Slackware 13.37:

Updated package for Slackware x86_64 13.37:

Updated package for Slackware 14.0:

Updated package for Slackware x86_64 14.0:

Updated package for Slackware 14.1:

Updated package for Slackware x86_64 14.1:

Updated package for Slackware 14.2:

Updated package for Slackware x86_64 14.2:

Updated package for Slackware -current:

Updated package for Slackware x86_64 -current:

MD5 signatures:

Slackware 13.0 package:
9da6d590915dc676f7da395c581b6d03 libXcursor-1.1.15-i486-1_slack13.0.txz

Slackware x86_64 13.0 package:
8cb6a2c7120dd1b9d3fd7f2d88bf26c5 libXcursor-1.1.15-x86_64-1_slack13.0.txz

Slackware 13.1 package:
23c99da35a637d941160636592d3e6e9 libXcursor-1.1.15-i486-1_slack13.1.txz

Slackware x86_64 13.1 package:
1b6bcc2c6810a8bc3c390335c3fc32bf libXcursor-1.1.15-x86_64-1_slack13.1.txz

Slackware 13.37 package:
9c3674a38ef2f20f7debcdc45c412b65 libXcursor-1.1.15-i486-1_slack13.37.txz

Slackware x86_64 13.37 package:
392f29eff1b4ba268ed88ebc90042142 libXcursor-1.1.15-x86_64-1_slack13.37.txz

Slackware 14.0 package:
41cf5ec1e976aaef8fdde39a5a1442f4 libXcursor-1.1.15-i486-1_slack14.0.txz

Slackware x86_64 14.0 package:
5e09cd739380c9b99f742f167c73eb06 libXcursor-1.1.15-x86_64-1_slack14.0.txz

Slackware 14.1 package:
0029d799edfb779e981479ca36d0f0ce libXcursor-1.1.15-i486-1_slack14.1.txz

Slackware x86_64 14.1 package:
bc092df828b88b5d562232b333b06006 libXcursor-1.1.15-x86_64-1_slack14.1.txz

Slackware 14.2 package:
4df9278d456bbdeca3a2f0d436a98787 libXcursor-1.1.15-i586-1_slack14.2.txz

Slackware x86_64 14.2 package:
7ebfaf2fe73c7fb0f06f13772836a54c libXcursor-1.1.15-x86_64-1_slack14.2.txz

Slackware -current package:
f1ec7555584a35f75d7538143ceaaea0 x/libXcursor-1.1.15-i586-1.txz

Slackware x86_64 -current package:
4f11abb90aa9aca34a475f100d6ac062 x/libXcursor-1.1.15-x86_64-1.txz

Installation instructions:

Upgrade the package as root:
# upgradepkg libXcursor-1.1.15-i586-1_slack14.2.txz


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