Bugzilla will be upgraded to version 5.0. The upgrade date is tentatively scheduled for 2 December 2018, pending final testing and feedback.
First Last Prev Next    This bug is not in your last search results.
Bug 1623242 - (CVE-2018-14600) CVE-2018-14600 libX11: Out of Bounds write in XListExtensions in ListExt.c
CVE-2018-14600 libX11: Out of Bounds write in XListExtensions in ListExt.c
Status: NEW
Product: Security Response
Classification: Other
Component: vulnerability (Show other bugs)
unspecified
All Linux
medium Severity medium
: ---
: ---
Assigned To: Red Hat Product Security
impact=moderate,public=20180821,repor...
: Security
Depends On: 1623243 1623244 1624412
Blocks: 1623253
  Show dependency tree / graph
 
Reported: 2018-08-28 16:07 EDT by Laura Pardo
Modified: 2018-09-19 08:38 EDT (History)
22 users (show)

See Also:
Fixed In Version: libX11 1.6.6
Doc Type: If docs needed, set a value
Doc Text:
An out of bounds write, limited to NULL bytes, was discovered in libX11 in functions XListExtensions() and XGetFontPath(). The length field is considered as a signed value, which makes the library access memory before the intended buffer. An attacker who can either configure a malicious X server or modify the data coming from one could use this flaw to make the program crash or have other unspecified effects, caused by the memory corruption.
Story Points: ---
Clone Of:
Environment:
Last Closed:
Type: ---
Regression: ---
Mount Type: ---
Documentation: ---
CRM:
Verified Versions:
Category: ---
oVirt Team: ---
RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: ---

Attachments (Terms of Use)
Add an attachment (proposed patch, testcase, etc.)

  None (edit)
Description Laura Pardo 2018-08-28 16:07:56 EDT 
An issue was discovered in libX11 through 1.6.5. Functions ListExt.c:XListExtensions and GetFPath.c:XGetFontPath interpret a variable as signed instead of unsigned, resulting in an out-of-bounds write (of up to 128 bytes), leading to DoS or remote code execution.


References:
http://www.openwall.com/lists/oss-security/2018/08/21/6
https://lists.x.org/archives/xorg-announce/2018-August/002916.html


Upstream Patch:
https://cgit.freedesktop.org/xorg/lib/libX11/commit/?id=dbf72805fd9d7b1846fe9a11b46f3994bfc27fea
Comment 1 Laura Pardo 2018-08-28 16:08:29 EDT 
Created libX11 tracking bugs for this issue:

Affects: fedora-all [bug 1623243]
Comment 4 Riccardo Schirone 2018-08-31 09:42:15 EDT 
Functions ListExt.c:XListExtensions and GetFPath.c:XGetFontPath interpret the length field, which is a char, as a signed value, resulting in a read and a write before the intended buffer when they traverse the list of extensions/paths provided by the server.
Note You need to log in before you can comment on or make changes to this bug.
First Last Prev Next    This bug is not in your last search results.