Bug 47753 - libx11: Multiple issues (4.2)
libx11: Multiple issues (4.2)
Status: CLOSED FIXED
Product: UCS
Classification: Unclassified
Component: Security updates
UCS 4.2
All Linux
: P3 normal (vote)
: UCS 4.2-4-errata
Assigned To: Quality Assurance
Arvid Requate
:
Depends on:
Blocks:
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Reported: 2018-09-04 18:27 CEST by Arvid Requate
Modified: 2018-09-05 13:17 CEST (History)
0 users

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Max CVSS v3 score: 5.0 (CVSS:3.0/AV:A/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L)


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Description Arvid Requate univentionstaff 2018-09-04 18:27:40 CEST
New Debian libx11 2:1.6.2-3+deb8u2 fixes:
This update addresses the following issue(s):
* 
* Crash on invalid reply in XListExtensions in ListExt.c (CVE-2018-14598)
* off-by-one error in XListExtensions in ListExt.c (CVE-2018-14599)
* Out of Bounds write in XListExtensions in ListExt.c (CVE-2018-14600)
Comment 1 Quality Assurance univentionstaff 2018-09-04 18:55:21 CEST
--- mirror/ftp/4.2/unmaintained/4.2-4/source/libx11_1.6.2-3+deb8u1.dsc
+++ apt/ucs_4.2-0-errata4.2-4/source/libx11_1.6.2-3+deb8u2.dsc
@@ -1,3 +1,21 @@
+2:1.6.2-3+deb8u2 [Wed, 29 Aug 2018 23:24:26 +0200] Markus Koschany <apo@debian.org>:
+
+  * Non-maintainer upload by the LTS team.
+  * Fix CVE-2018-14598, CVE-2018-14599 and CVE-2018-14600:
+  * CVE-2018-14599:
+    The functions XGetFontPath, XListExtensions, and XListFonts are vulnerable
+    to an off-by-one override on malicious server responses.
+  * CVE-2018-14600:
+    The length value is interpreted as signed char on many systems (depending
+    on default signedness of char), which can lead to an out of boundary write
+    up to 128 bytes in front of the allocated storage, but limited to NUL
+    byte(s).
+  * CVE-2018-14598:
+    If the server sends a reply in which even the first string would overflow
+    the transmitted bytes, list[0] (or flist[0]) will be set to NULL and a
+    count of 0 is returned. This may trigger a segmentation fault leading to a
+    Denial of Service.
+
 2:1.6.2-3+deb8u1 [Sat, 28 Jan 2017 14:01:35 +0100] Julien Cristau <jcristau@debian.org>:
 
   * Insufficient validation of data from the X server can cause out of

<http://10.200.17.11/4.2-4/#3214080127618062062>
Comment 2 Arvid Requate univentionstaff 2018-09-04 20:37:40 CEST
The upstream package has been copied. No UCS specific patches.

Piuparts report and advisory look ok.
Comment 3 Arvid Requate univentionstaff 2018-09-05 13:17:18 CEST
<http://errata.software-univention.de/ucs/4.2/503.html>