Bug 1203719 (CVE-2015-1804) - CVE-2015-1804 libXfont: out-of-bounds memory access in bdfReadCharacters
Summary: CVE-2015-1804 libXfont: out-of-bounds memory access in bdfReadCharacters
Alias: CVE-2015-1804
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
Target Milestone: ---
Assignee: Red Hat Product Security
QA Contact:
Depends On: 1203720 1258892 1258893 1258894 1258895
Blocks: 1203722
TreeView+ depends on / blocked
Reported: 2015-03-19 14:14 UTC by Martin Prpič
Modified: 2021-02-17 05:30 UTC (History)
5 users (show)

Fixed In Version: libXfont 1.5.1, libXfont 1.4.9
Doc Type: Bug Fix
Doc Text:
An integer truncation flaw was discovered in the way libXfont processed certain Glyph Bitmap Distribution Format (BDF) fonts. A malicious, local user could use this flaw to crash the X.Org server or, potentially, execute arbitrary code with the privileges of the X.Org server.
Clone Of:
Last Closed: 2019-06-08 02:40:11 UTC

Attachments (Terms of Use)

System ID Private Priority Status Summary Last Updated
Red Hat Product Errata RHSA-2015:1708 0 normal SHIPPED_LIVE Important: libXfont security update 2015-09-03 15:26:36 UTC

Description Martin Prpič 2015-03-19 14:14:03 UTC
The bdf parser read metrics values as 32-bit integers, but stored them into 16-bit integers. Overflows could occur in various operations leading to out-of-bounds memory access.

A local user could exploit this issue to potentially execute arbitrary code with the privileges of the X.Org server.

Upstream patch:


External References:


Comment 1 Martin Prpič 2015-03-19 14:15:14 UTC
Created libXfont tracking bugs for this issue:

Affects: fedora-all [bug 1203720]

Comment 2 Fedora Update System 2015-03-23 07:17:15 UTC
libXfont-1.5.1-1.fc21 has been pushed to the Fedora 21 stable repository.  If problems still persist, please make note of it in this bug report.

Comment 4 errata-xmlrpc 2015-09-03 11:26:59 UTC
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 7
  Red Hat Enterprise Linux 6

Via RHSA-2015:1708 https://rhn.redhat.com/errata/RHSA-2015-1708.html

Comment 5 ddu 2015-09-07 05:07:51 UTC
Hi guys,

Does this problem CVE affect libXfont shipped with RHEL5?

Best regards,

Comment 6 Matt Goldman 2015-09-07 14:08:32 UTC

Yes, from the whiteboard RHEL 5 is affected:


However, RHEL 5 has entered Production Phase 3 as of January 31, 2014. As per our errata policy:
    "During the Production 3 Phase, Critical impact Security Advisories (RHSAs) and selected Urgent Priority Bug Fix Advisories (RHBAs) may be released as they become available."
    Red Hat Enterprise Linux Life Cycle

This means that Red Hat will not be addressing Low, Moderate, or Important impact CVE's in relation to RHEL 5.

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