National Vulnerability Database

National Vulnerability Database

National Vulnerability

CVE-2007-4990 Detail


The swap_char2b function in X.Org X Font Server (xfs) before 1.0.5 allows context-dependent attackers to execute arbitrary code via (1) QueryXBitmaps and (2) QueryXExtents protocol requests with crafted size values that specify an arbitrary number of bytes to be swapped on the heap, which triggers heap corruption.

Source:  MITRE      Last Modified:  10/05/2007

Quick Info

CVE Dictionary Entry:
Original release date:
Last revised:


CVSS Severity (version 2.0):
CVSS v2 Base Score:
7.5 HIGH
(AV:N/AC:L/Au:N/C:P/I:P/A:P) (legend)
Impact Subscore:
Exploitability Subscore:
CVSS Version 2 Metrics:
Access Vector:
Network exploitable
Access Complexity:
Not required to exploit
Impact Type:
Provides unauthorized access, Allows partial confidentiality, integrity, and availability violation; Allows unauthorized disclosure of information; Allows disruption of service

Vendor Statements (disclaimer)

Official Statement from Red Hat (10/08/2007)

Red Hat is aware of this issue and is tracking it via the following bug: The Red Hat Security Response Team has rated this issue as having low security impact, a future update may address this flaw.

References to Advisories, Solutions, and Tools

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Hyperlink Resource Type Source Name External Source CONFIRM External Source CONFIRM External Source CONFIRM External Source HP SSRT071468 External Source IDEFENSE 20071002 Multiple Vendor X Font Server Multiple Vulnerabilities External Source APPLE APPLE-SA-2008-03-18 External Source MLIST [xorg-announce] 20071002 [ANNOUNCE] X.Org security advisory: multiple vulnerabilities in X font server External Source GENTOO GLSA-200710-11 External Source SUNALERT 103114 External Source SUNALERT 200642 External Source MANDRIVA MDKSA-2007:210 External Source SUSE SUSE-SA:2007:054 External Source REDHAT RHSA-2008:0029 External Source REDHAT RHSA-2008:0030 External Source BUGTRAQ 20071003 rPSA-2007-0205-1 xorg-x11 xorg-x11-fonts xorg-x11-tools xorg-x11-xfs External Source BID 25898 External Source SECTRACK 1018763 External Source VUPEN ADV-2007-3337 External Source VUPEN ADV-2007-3338 External Source VUPEN ADV-2007-3467 External Source VUPEN ADV-2008-0149 External Source VUPEN ADV-2008-0924 External Source XF xfs-queryxbitmaps-queryxextents-bo(36920) External Source CONFIRM External Source OVAL oval:org.mitre.oval:def:11599 External Source FEDORA FEDORA-2007-4263

References to Check Content

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