Bug 38068

Summary:	libxfont: Multiple issues (4.1)
Product:	UCS	Reporter:	Arvid Requate <requate>
Component:	Security updates	Assignee:	UCS maintainers <ucs-maintainers>
Status:	CLOSED WONTFIX	QA Contact:
Severity:	normal
Priority:	P5	Flags:	requate: Patch_Available+
Version:	UCS 4.1
Target Milestone:	UCS 4.1-x-errata
Hardware:	Other
OS:	Linux
What kind of report is it?:	Security Issue	What type of bug is this?:	---
Who will be affected by this bug?:	---	How will those affected feel about the bug?:	---
User Pain:		Enterprise Customer affected?:
School Customer affected?:		ISV affected?:
Waiting Support:		Flags outvoted (downgraded) after PO Review:
Ticket number:		Bug group (optional):
Max CVSS v3 score:	6.9 (AV:L/AC:M/Au:N/C:C/I:C/A:C)
Bug Depends on:	45621
Bug Blocks:

Description Arvid Requate

2015-03-17 17:40:20 CET

CVE-2015-1802 CVE-2015-1803 CVE-2015-1804:

Possible privilege escalation of local users against X server due to insufficient range checks in libxfont during parsing of BDF font files.

Comment 1 Arvid Requate

2015-03-17 17:47:37 CET

More details:

CVE-2015-1803:

Possible X server crash due to insufficient recognition of invalid BDF font data.

CVE-2015-1804:

Out-of-bounds memory read due to insufficient boundary checking on BDF font data.

Comment 2 Arvid Requate

2015-05-06 16:51:14 CEST

Fixed in upstream Debian package version 1:1.4.5-5

Comment 3 Arvid Requate

2017-10-30 19:53:55 CET

Upstream Debian package version 1:1.4.5-5+deb7u1 fixes:

* In the PatternMatch function in fontfile/fontdir.c in libXfont through 1.5.2 and 2.x before 2.0.2, an attacker with access to an X connection can cause a buffer over-read during pattern matching of fonts, leading to information disclosure or a crash (denial of service). This occurs because '\0' characters are incorrectly skipped in situations involving ? characters. (CVE-2017-13720)
* In the pcfGetProperties function in bitmap/pcfread.c in libXfont through 1.5.2 and 2.x before 2.0.2, a missing boundary check (for PCF files) could be used by local attackers authenticated to an Xserver for a buffer over-read, for information disclosure or a crash of the X server. (CVE-2017-13722)

Comment 4 Arvid Requate

2018-04-17 15:56:08 CEST

This issue has been filed against UCS 4.1.

UCS 4.1 is out of maintenance and many UCS components have vastly changed in later releases. Thus, this issue is now being closed.

If this issue still occurs in newer UCS versions, please use "Clone this bug" or reopen this issue. In this case please provide detailed information on how this issue is affecting you.