ID CVE-2007-1859
Summary XScreenSaver 4.10, when using a remote directory service for credentials, does not properly handle the results from the getpwuid function in drivers/lock.c when there is no network connectivity, which causes XScreenSaver to crash and unlock the screen and allows local users to bypass authentication.
References
Vulnerable Configurations
  • cpe:2.3:o:redhat:enterprise_linux:2.1:-:advanced_server
    cpe:2.3:o:redhat:enterprise_linux:2.1:-:advanced_server
  • cpe:2.3:o:redhat:enterprise_linux:2.1:-:enterprise_server
    cpe:2.3:o:redhat:enterprise_linux:2.1:-:enterprise_server
  • cpe:2.3:o:redhat:enterprise_linux:2.1:-:workstation
    cpe:2.3:o:redhat:enterprise_linux:2.1:-:workstation
  • cpe:2.3:o:redhat:enterprise_linux:3.0:-:advanced_servers
    cpe:2.3:o:redhat:enterprise_linux:3.0:-:advanced_servers
  • cpe:2.3:o:redhat:enterprise_linux:3.0:-:enterprise_server
    cpe:2.3:o:redhat:enterprise_linux:3.0:-:enterprise_server
  • cpe:2.3:o:redhat:enterprise_linux:3.0:-:workstation
    cpe:2.3:o:redhat:enterprise_linux:3.0:-:workstation
  • cpe:2.3:o:redhat:enterprise_linux:4.0:-:advanced_server
    cpe:2.3:o:redhat:enterprise_linux:4.0:-:advanced_server
  • cpe:2.3:o:redhat:enterprise_linux:4.0:-:enterprise_server
    cpe:2.3:o:redhat:enterprise_linux:4.0:-:enterprise_server
  • cpe:2.3:o:redhat:enterprise_linux:4.0:-:workstation
    cpe:2.3:o:redhat:enterprise_linux:4.0:-:workstation
  • Red Hat Desktop 3.0
    cpe:2.3:o:redhat:enterprise_linux_desktop:3.0
  • Red Hat Desktop 4.0
    cpe:2.3:o:redhat:enterprise_linux_desktop:4.0
  • cpe:2.3:o:redhat:linux_advanced_workstation:2.1:-:itanium
    cpe:2.3:o:redhat:linux_advanced_workstation:2.1:-:itanium
  • cpe:2.3:a:xscreensaver:xscreensaver:4.10
    cpe:2.3:a:xscreensaver:xscreensaver:4.10
CVSS
Base: 4.6 (as of 03-05-2007 - 09:50)
Impact:
Exploitability:
CWE CWE-287
CAPEC
  • Authentication Abuse
    An attacker obtains unauthorized access to an application, service or device either through knowledge of the inherent weaknesses of an authentication mechanism, or by exploiting a flaw in the authentication scheme's implementation. In such an attack an authentication mechanism is functioning but a carefully controlled sequence of events causes the mechanism to grant access to the attacker. This attack may exploit assumptions made by the target's authentication procedures, such as assumptions regarding trust relationships or assumptions regarding the generation of secret values. This attack differs from Authentication Bypass attacks in that Authentication Abuse allows the attacker to be certified as a valid user through illegitimate means, while Authentication Bypass allows the user to access protected material without ever being certified as an authenticated user. This attack does not rely on prior sessions established by successfully authenticating users, as relied upon for the "Exploitation of Session Variables, Resource IDs and other Trusted Credentials" attack patterns.
  • Exploiting Trust in Client (aka Make the Client Invisible)
    An attack of this type exploits a programs' vulnerabilities in client/server communication channel authentication and data integrity. It leverages the implicit trust a server places in the client, or more importantly, that which the server believes is the client. An attacker executes this type of attack by placing themselves in the communication channel between client and server such that communication directly to the server is possible where the server believes it is communicating only with a valid client. There are numerous variations of this type of attack.
  • Utilizing REST's Trust in the System Resource to Register Man in the Middle
    This attack utilizes a REST(REpresentational State Transfer)-style applications' trust in the system resources and environment to place man in the middle once SSL is terminated. Rest applications premise is that they leverage existing infrastructure to deliver web services functionality. An example of this is a Rest application that uses HTTP Get methods and receives a HTTP response with an XML document. These Rest style web services are deployed on existing infrastructure such as Apache and IIS web servers with no SOAP stack required. Unfortunately from a security standpoint, there frequently is no interoperable identity security mechanism deployed, so Rest developers often fall back to SSL to deliver security. In large data centers, SSL is typically terminated at the edge of the network - at the firewall, load balancer, or router. Once the SSL is terminated the HTTP request is in the clear (unless developers have hashed or encrypted the values, but this is rare). The attacker can utilize a sniffer such as Wireshark to snapshot the credentials, such as username and password that are passed in the clear once SSL is terminated. Once the attacker gathers these credentials, they can submit requests to the web service provider just as authorized user do. There is not typically an authentication on the client side, beyond what is passed in the request itself so once this is compromised, then this is generally sufficient to compromise the service's authentication scheme.
  • Man in the Middle Attack
    This type of attack targets the communication between two components (typically client and server). The attacker places himself in the communication channel between the two components. Whenever one component attempts to communicate with the other (data flow, authentication challenges, etc.), the data first goes to the attacker, who has the opportunity to observe or alter it, and it is then passed on to the other component as if it was never intercepted. This interposition is transparent leaving the two compromised components unaware of the potential corruption or leakage of their communications. The potential for Man-in-the-Middle attacks yields an implicit lack of trust in communication or identify between two components.
Access
VectorComplexityAuthentication
LOCAL LOW NONE
Impact
ConfidentialityIntegrityAvailability
PARTIAL PARTIAL PARTIAL
nessus via4
  • NASL family CentOS Local Security Checks
    NASL id CENTOS_RHSA-2007-0322.NASL
    description An updated xscreensaver package that fixes a security flaw is now available for Red Hat Enterprise Linux 2.1, 3, and 4. This update has been rated as having moderate security impact by the Red Hat Security Response Team. XScreenSaver is a collection of screensavers. Alex Yamauchi discovered a flaw in the way XScreenSaver verifies user passwords. When a system is using a remote directory service for login credentials, a local attacker may be able to cause a network outage causing XScreenSaver to crash, unlocking the screen. (CVE-2007-1859) Users of XScreenSaver should upgrade to this updated package, which contains a backported patch to correct this issue.
    last seen 2019-02-21
    modified 2018-11-10
    plugin id 25150
    published 2007-05-03
    reporter Tenable
    source https://www.tenable.com/plugins/index.php?view=single&id=25150
    title CentOS 3 : xscreensaver (CESA-2007:0322)
  • NASL family SuSE Local Security Checks
    NASL id SUSE_XSCREENSAVER-3240.NASL
    description xscreensaver could crash under certain circumstances and so cause unlocking the screen. That could happen for example when LDAP is used for authentication and the network connection gets interrupted for a long time (CVE-2007-1859).
    last seen 2019-02-21
    modified 2018-07-19
    plugin id 27500
    published 2007-10-17
    reporter Tenable
    source https://www.tenable.com/plugins/index.php?view=single&id=27500
    title openSUSE 10 Security Update : xscreensaver (xscreensaver-3240)
  • NASL family SuSE Local Security Checks
    NASL id SUSE9_11506.NASL
    description Xscreensaver could crash under certain circumstances causing the screen to unlock. That could happen for example when LDAP is used for authentication and the network connection gets interrupted for a long time. (CVE-2007-1859)
    last seen 2019-02-21
    modified 2014-06-03
    plugin id 41131
    published 2009-09-24
    reporter Tenable
    source https://www.tenable.com/plugins/index.php?view=single&id=41131
    title SuSE9 Security Update : xscreensaver (YOU Patch Number 11506)
  • NASL family Gentoo Local Security Checks
    NASL id GENTOO_GLSA-200705-14.NASL
    description The remote host is affected by the vulnerability described in GLSA-200705-14 (XScreenSaver: Privilege escalation) XScreenSaver incorrectly handles the results of the getpwuid() function in drivers/lock.c when using directory servers during a network outage. Impact : A local user can crash XScreenSaver by preventing network connectivity if the system uses a remote directory service for credentials such as NIS or LDAP, which will unlock the screen. Workaround : There is no known workaround at this time.
    last seen 2019-02-21
    modified 2018-08-10
    plugin id 25235
    published 2007-05-16
    reporter Tenable
    source https://www.tenable.com/plugins/index.php?view=single&id=25235
    title GLSA-200705-14 : XScreenSaver: Privilege escalation
  • NASL family Scientific Linux Local Security Checks
    NASL id SL_20070502_XSCREENSAVER_ON_SL4.NASL
    description Alex Yamauchi discovered a flaw in the way XScreenSaver verifies user passwords. When a system is using a remote directory service for login credentials, a local attacker may be able to cause a network outage causing XScreenSaver to crash, unlocking the screen. (CVE-2007-1859)
    last seen 2019-02-21
    modified 2019-01-07
    plugin id 60175
    published 2012-08-01
    reporter Tenable
    source https://www.tenable.com/plugins/index.php?view=single&id=60175
    title Scientific Linux Security Update : xscreensaver on SL4 i386/x86_64
  • NASL family Red Hat Local Security Checks
    NASL id REDHAT-RHSA-2007-0322.NASL
    description An updated xscreensaver package that fixes a security flaw is now available for Red Hat Enterprise Linux 2.1, 3, and 4. This update has been rated as having moderate security impact by the Red Hat Security Response Team. XScreenSaver is a collection of screensavers. Alex Yamauchi discovered a flaw in the way XScreenSaver verifies user passwords. When a system is using a remote directory service for login credentials, a local attacker may be able to cause a network outage causing XScreenSaver to crash, unlocking the screen. (CVE-2007-1859) Users of XScreenSaver should upgrade to this updated package, which contains a backported patch to correct this issue.
    last seen 2019-02-21
    modified 2018-11-16
    plugin id 25158
    published 2007-05-03
    reporter Tenable
    source https://www.tenable.com/plugins/index.php?view=single&id=25158
    title RHEL 2.1 / 3 / 4 : xscreensaver (RHSA-2007:0322)
  • NASL family Scientific Linux Local Security Checks
    NASL id SL_20070502_XSCREENSAVER_ON_SL3_0_X.NASL
    description Alex Yamauchi discovered a flaw in the way XScreenSaver verifies user passwords. When a system is using a remote directory service for login credentials, a local attacker may be able to cause a network outage causing XScreenSaver to crash, unlocking the screen. (CVE-2007-1859)
    last seen 2019-02-21
    modified 2019-01-07
    plugin id 60174
    published 2012-08-01
    reporter Tenable
    source https://www.tenable.com/plugins/index.php?view=single&id=60174
    title Scientific Linux Security Update : xscreensaver on SL3.0.x i386/x86_64
  • NASL family Ubuntu Local Security Checks
    NASL id UBUNTU_USN-474-1.NASL
    description It was discovered that xscreensaver did not correctly validate the return values from network authentication systems such as LDAP or NIS. A local attacker could bypass a locked screen if they were able to interrupt network connectivity. Note that Tenable Network Security has extracted the preceding description block directly from the Ubuntu security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.
    last seen 2019-02-21
    modified 2018-11-28
    plugin id 28075
    published 2007-11-10
    reporter Tenable
    source https://www.tenable.com/plugins/index.php?view=single&id=28075
    title Ubuntu 6.06 LTS / 6.10 / 7.04 : xscreensaver vulnerability (USN-474-1)
  • NASL family Oracle Linux Local Security Checks
    NASL id ORACLELINUX_ELSA-2007-0322.NASL
    description From Red Hat Security Advisory 2007:0322 : An updated xscreensaver package that fixes a security flaw is now available for Red Hat Enterprise Linux 2.1, 3, and 4. This update has been rated as having moderate security impact by the Red Hat Security Response Team. XScreenSaver is a collection of screensavers. Alex Yamauchi discovered a flaw in the way XScreenSaver verifies user passwords. When a system is using a remote directory service for login credentials, a local attacker may be able to cause a network outage causing XScreenSaver to crash, unlocking the screen. (CVE-2007-1859) Users of XScreenSaver should upgrade to this updated package, which contains a backported patch to correct this issue.
    last seen 2019-02-21
    modified 2018-07-18
    plugin id 67485
    published 2013-07-12
    reporter Tenable
    source https://www.tenable.com/plugins/index.php?view=single&id=67485
    title Oracle Linux 3 / 4 : xscreensaver (ELSA-2007-0322)
  • NASL family Mandriva Local Security Checks
    NASL id MANDRAKE_MDKSA-2007-097.NASL
    description A problem with the way xscreensaver verifies user passwords was discovered by Alex Yamauchi. When a system is using remote authentication (i.e. LDAP) for logins, a local attacker able to cause a network outage on the system could cause xscreensaver to crash, which would unlock the screen. Updated packages have been patched to correct this issue.
    last seen 2019-02-21
    modified 2018-07-19
    plugin id 25157
    published 2007-05-03
    reporter Tenable
    source https://www.tenable.com/plugins/index.php?view=single&id=25157
    title Mandrake Linux Security Advisory : xscreensaver (MDKSA-2007:097)
  • NASL family SuSE Local Security Checks
    NASL id SUSE_XSCREENSAVER-3241.NASL
    description xscreensaver could crash under certain circumstances causing the screen to unlock. That could happen for example when LDAP is used for authentication and the network connection gets interrupted for a long time. (CVE-2007-1859)
    last seen 2019-02-21
    modified 2014-06-03
    plugin id 29611
    published 2007-12-13
    reporter Tenable
    source https://www.tenable.com/plugins/index.php?view=single&id=29611
    title SuSE 10 Security Update : xscreensaver (ZYPP Patch Number 3241)
oval via4
accepted 2013-04-29T04:14:12.417-04:00
class vulnerability
contributors
  • name Aharon Chernin
    organization SCAP.com, LLC
  • name Dragos Prisaca
    organization G2, Inc.
definition_extensions
  • comment The operating system installed on the system is Red Hat Enterprise Linux 3
    oval oval:org.mitre.oval:def:11782
  • comment CentOS Linux 3.x
    oval oval:org.mitre.oval:def:16651
  • comment The operating system installed on the system is Red Hat Enterprise Linux 4
    oval oval:org.mitre.oval:def:11831
  • comment CentOS Linux 4.x
    oval oval:org.mitre.oval:def:16636
  • comment Oracle Linux 4.x
    oval oval:org.mitre.oval:def:15990
description XScreenSaver 4.10, when using a remote directory service for credentials, does not properly handle the results from the getpwuid function in drivers/lock.c when there is no network connectivity, which causes XScreenSaver to crash and unlock the screen and allows local users to bypass authentication.
family unix
id oval:org.mitre.oval:def:11459
status accepted
submitted 2010-07-09T03:56:16-04:00
title XScreenSaver 4.10, when using a remote directory service for credentials, does not properly handle the results from the getpwuid function in drivers/lock.c when there is no network connectivity, which causes XScreenSaver to crash and unlock the screen and allows local users to bypass authentication.
version 22
redhat via4
advisories
bugzilla
id 237003
title CVE-2007-1859 xscreensaver authentication bypass
oval
OR
  • AND
    • comment Red Hat Enterprise Linux 3 is installed
      oval oval:com.redhat.rhsa:tst:20060015001
    • comment xscreensaver is earlier than 1:4.10-21.el3
      oval oval:com.redhat.rhsa:tst:20070322002
    • comment xscreensaver is signed with Red Hat master key
      oval oval:com.redhat.rhsa:tst:20070322003
  • AND
    • comment Red Hat Enterprise Linux 4 is installed
      oval oval:com.redhat.rhsa:tst:20060016001
    • comment xscreensaver is earlier than 1:4.18-5.rhel4.14
      oval oval:com.redhat.rhsa:tst:20070322005
    • comment xscreensaver is signed with Red Hat master key
      oval oval:com.redhat.rhsa:tst:20070322003
rhsa
id RHSA-2007:0322
released 2007-05-02
severity Moderate
title RHSA-2007:0322: xscreensaver security update (Moderate)
rpms
  • xscreensaver-1:4.10-21.el3
  • xscreensaver-1:4.18-5.rhel4.14
refmap via4
bid 23783
confirm https://issues.rpath.com/browse/RPL-1293
gentoo GLSA-200705-14
mandriva MDKSA-2007:097
osvdb 35531
sectrack 1017996
secunia
  • 25065
  • 25105
  • 25116
  • 25118
  • 25119
  • 25225
  • 25610
suse SUSE-SR:2007:009
ubuntu USN-474-1
xf xscreensaver-getpwuid-authentication-bypass(34054)
Last major update 05-11-2012 - 22:36
Published 02-05-2007 - 16:19
Last modified 10-10-2017 - 21:32
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