Directory traversal vulnerability in scp for OpenSSH before 3.4p1 allows remote malicious servers to overwrite arbitrary files. NOTE: this may be a rediscovery of CVE-2000-0992.

According to its banner, the version of OpenSSH running on the remote host is earlier than version 3.4p1. Such versions contain an arbitrary file overwrite vulnerability that could allow a malicious SSH server to cause the supplied scp utility to write to arbitrary files outside of the current directory.

According to its banner, the version of OpenSSH running on the remote host is earlier than version 3.4p1.  Such versions contain an arbitrary file overwrite vulnerability that could allow a malicious SSH server to cause the supplied scp utility to write to arbitrary files outside of the current directory.

The version of SunSSH running on the remote host has an information disclosure vulnerability.  A design flaw in the SSH specification could allow a man-in-the-middle attacker to recover up to 32 bits of plaintext from an SSH-protected connection in the standard configuration.  An attacker could exploit this to gain access to sensitive information.

Note that this version of SunSSH is also prone to several additional issues but Nessus did not test for them.

A vulnerability in the rcp protocol was discovered that allows a server to instruct a client to write arbitrary files outside of the current directory, which could potentially be a security concern if a user used rcp to copy files from a malicious server (CVE-2004-0175).

This issue was originally corrected in MDKSA-2005:100, but the patch had not been applied to the development tree, so released packages after that date did not have the fix applied.

This update also corrects an issue where rexecd did not honor settings in /etc/security/limits if pam_limits was in use.

Updated krb5 packages that fix multiple security issues are now available for Red Hat Enterprise Linux 4.

This update has been rated as having important security impact by the Red Hat Security Response Team.

Kerberos is a networked authentication system that uses a trusted third party (a KDC) to authenticate clients and servers to each other.

A double-free flaw was found in the krb5_recvauth() routine which may be triggered by a remote unauthenticated attacker. Red Hat Enterprise Linux 4 contains checks within glibc that detect double-free flaws.
Therefore, on Red Hat Enterprise Linux 4 successful exploitation of this issue can only lead to a denial of service (KDC crash). The Common Vulnerabilities and Exposures project assigned the name CVE-2005-1689 to this issue.

Daniel Wachdorf discovered a single byte heap overflow in the krb5_unparse_name() function, part of krb5-libs. Sucessful exploitation of this flaw would lead to a denial of service (crash).
To trigger this flaw an attacker would need to have control of a kerberos realm that shares a cross-realm key with the target, making exploitation of this flaw unlikely. (CVE-2005-1175).

Daniel Wachdorf also discovered that in error conditions that may occur in response to correctly-formatted client requests, the Kerberos 5 KDC may attempt to free uninitialized memory. This could allow a remote attacker to cause a denial of service (KDC crash) (CVE-2005-1174).

Gael Delalleau discovered an information disclosure issue in the way some telnet clients handle messages from a server. An attacker could construct a malicious telnet server that collects information from the environment of any victim who connects to it using the Kerberos-aware telnet client (CVE-2005-0488).

The rcp protocol allows a server to instruct a client to write to arbitrary files outside of the current directory. This could potentially cause a security issue if a user uses the Kerberos-aware rcp to copy files from a malicious server (CVE-2004-0175).

All users of krb5 should update to these erratum packages, which contain backported patches to correct these issues. Red Hat would like to thank the MIT Kerberos Development Team for their responsible disclosure of these issues.

Updated rsh packages that fix various bugs and a theoretical security issue are now available.

This update has been rated as having low security impact by the Red Hat Security Response Team

The rsh package contains a set of programs that allow users to run commands on remote machines, login to other machines, and copy files between machines, using the rsh, rlogin, and rcp commands. All three of these commands use rhosts-style authentication.

The rcp protocol allows a server to instruct a client to write to arbitrary files outside of the current directory. This could potentially cause a security issue if a user uses rcp to copy files from a malicious server. The Common Vulnerabilities and Exposures project (cve.mitre.org) has assigned the name CVE-2004-0175 to this issue.

These updated packages also address the following bugs :

The rlogind server reported 'SIGCHLD set to SIG_IGN but calls wait()' message to the system log because the original BSD code was ported incorrectly to linux.

The rexecd server did not function on systems where client hostnames were not in the DNS service, because server code called gethostbyaddr() for each new connection.

The rcp command incorrectly used the 'errno' variable and produced erroneous error messages.

The rexecd command ignored settings in the /etc/security/limits file, because the PAM session was incorrectly initialized.

All users of rsh should upgrade to these updated packages, which resolve these issues.

Updated krb5 packages which fix multiple security issues are now available for Red Hat Enterprise Linux 2.1 and 3.

This update has been rated as having critical security impact by the Red Hat Security Response Team.

[Updated 26 Sep 2005] krb5-server packages have been added to this advisory for Red Hat Enterprise Linux 3 WS and Red Hat Enterprise Linux 3 Desktop.

Kerberos is a networked authentication system which uses a trusted third party (a KDC) to authenticate clients and servers to each other.

A double-free flaw was found in the krb5_recvauth() routine which may be triggered by a remote unauthenticated attacker. Although no exploit is currently known to exist, this issue could potentially be exploited to allow arbitrary code execution on a Key Distribution Center (KDC).
The Common Vulnerabilities and Exposures project assigned the name CVE-2005-1689 to this issue.

Daniel Wachdorf discovered a single byte heap overflow in the krb5_unparse_name() function, part of krb5-libs. Sucessful exploitation of this flaw would lead to a denial of service (crash).
To trigger this flaw an attacker would need to have control of a kerberos realm that shares a cross-realm key with the target, making exploitation of this flaw unlikely. (CVE-2005-1175).

Gael Delalleau discovered an information disclosure issue in the way some telnet clients handle messages from a server. An attacker could construct a malicious telnet server that collects information from the environment of any victim who connects to it using the Kerberos-aware telnet client (CVE-2005-0488).

The rcp protocol allows a server to instruct a client to write to arbitrary files outside of the current directory. This could potentially cause a security issue if a user uses the Kerberos-aware rcp to copy files from a malicious server (CVE-2004-0175).

All users of krb5 should update to these erratum packages which contain backported patches to correct these issues. Red Hat would like to thank the MIT Kerberos Development Team for their responsible disclosure of these issues.

Updated openssh packages that fix a potential security vulnerability and various other bugs are now available for Red Hat Enterprise Linux 3.

This update has been rated as having low security impact by the Red Hat Security Response Team.

OpenSSH is OpenBSD's SSH (Secure SHell) protocol implementation. SSH replaces rlogin and rsh, and provides secure encrypted communications between two untrusted hosts over an insecure network. X11 connections and arbitrary TCP/IP ports can also be forwarded over a secure channel. Public key authentication can be used for 'passwordless' access to servers.

The scp protocol allows a server to instruct a client to write to arbitrary files outside of the current directory. This could potentially cause a security issue if a user uses scp to copy files from a malicious server. The Common Vulnerabilities and Exposures project (cve.mitre.org) has assigned the name CVE-2004-0175 to this issue.

These updated packages also correct the following bugs :

On systems where direct ssh access for the root user was disabled by configuration (setting 'PermitRootLogin no'), attempts to guess the root password could be judged as sucessful or unsucessful by observing a delay.

On systems where the privilege separation feature was turned on, the user resource limits were not correctly set if the configuration specified to raise them above the defaults. It was also not possible to change an expired password.

Users of openssh should upgrade to these updated packages, which contain backported patches to resolve these issues.

Updated rsh packages that fix various bugs and a theoretical security issue are now available.

This update has been rated as having low security impact by the Red Hat Security Response Team

The rsh package contains a set of programs that allow users to run commands on remote machines, login to other machines, and copy files between machines, using the rsh, rlogin, and rcp commands. All three of these commands use rhosts-style authentication.

The rcp protocol allows a server to instruct a client to write to arbitrary files outside of the current directory. This could potentially cause a security issue if a user uses rcp to copy files from a malicious server. The Common Vulnerabilities and Exposures project (cve.mitre.org) has assigned the name CVE-2004-0175 to this issue.

These updated packages also address the following bugs :

The rexec command failed with 'Invalid Argument', because the code used sigaction() as an unsupported signal.

The rlogind server reported 'SIGCHLD set to SIG_IGN but calls wait()' message to the system log because the original BSD code was ported incorrectly to linux.

The rexecd server did not function on systems where client hostnames were not in the DNS service, because server code called gethostbyaddr() for each new connection.

The rcp command incorrectly used the 'errno' variable and produced erroneous error messages.

The rexecd command ignored settings in the /etc/security/limits file, because the PAM session was incorrectly initialized.

The rexec command prompted for username and password regardless of the ~/.netrc configuration file contents. This updated package contains a patch that no longer skips the ~/.netrc file.

All users of rsh should upgrade to these updated packages, which resolve these issues.

A number of vulnerabilities have been corrected in this Kerberos update :

The rcp protocol would allow a server to instruct a client to write to arbitrary files outside of the current directory. The Kerberos-aware rcp could be abused to copy files from a malicious server (CVE-2004-0175).

Gael Delalleau discovered an information disclosure vulnerability in the way some telnet clients handled messages from a server. This could be abused by a malicious telnet server to collect information from the environment of any victim connecting to the server using the Kerberos- aware telnet client (CVE-2005-0488).

Daniel Wachdorf disovered that in error conditions that could occur in response to correctly-formatted client requests, the Kerberos 5 KDC may attempt to free uninitialized memory, which could cause the KDC to crash resulting in a Denial of Service (CVE-2005-1174).

Daniel Wachdorf also discovered a single-byte heap overflow in the krb5_unparse_name() function that could, if successfully exploited, lead to a crash, resulting in a DoS. To trigger this flaw, an attacker would need to have control of a Kerberos realm that shares a cross- realm key with the target (CVE-2005-1175).

Finally, a double-free flaw was discovered in the krb5_recvauth() routine which could be triggered by a remote unauthenticated attacker.
This issue could potentially be exploited to allow for the execution of arbitrary code on a KDC. No exploit is currently known to exist (CVE-2005-1689).

The updated packages have been patched to address this issue and Mandriva urges all users to upgrade to these packages as quickly as possible.

The remote Redhat Enterprise Linux 4 host has packages installed that are affected by multiple vulnerabilities as referenced in the RHSA-2005:567 advisory.

    Kerberos is a networked authentication system that uses a trusted third     party (a KDC) to authenticate clients and servers to each other.

    A double-free flaw was found in the krb5_recvauth() routine which may be     triggered by a remote unauthenticated attacker.  Red Hat Enterprise Linux 4     contains checks within glibc that detect double-free flaws.  Therefore, on     Red Hat Enterprise Linux 4 successful exploitation of this issue can only     lead to a denial of service (KDC crash).  The Common Vulnerabilities and     Exposures project assigned the name CAN-2005-1689 to this issue.

    Daniel Wachdorf discovered a single byte heap overflow in the     krb5_unparse_name() function, part of krb5-libs.  Sucessful exploitation of     this flaw would lead to a denial of service (crash).  To trigger this flaw     an attacker would need to have control of a kerberos realm that shares a     cross-realm key with the target, making exploitation of this flaw unlikely.
    (CAN-2005-1175).

    Daniel Wachdorf also discovered that in error conditions that may occur in     response to correctly-formatted client requests, the Kerberos 5 KDC may     attempt to free uninitialized memory.  This could allow a remote attacker     to cause a denial of service (KDC crash) (CAN-2005-1174).

    Gal Delalleau discovered an information disclosure issue in the way     some telnet clients handle messages from a server. An attacker could     construct a malicious telnet server that collects information from the     environment of any victim who connects to it using the Kerberos-aware     telnet client (CAN-2005-0488).

    The rcp protocol allows a server to instruct a client to write to arbitrary     files outside of the current directory. This could potentially cause a     security issue if a user uses the Kerberos-aware rcp to copy files from a     malicious server (CAN-2004-0175).

    All users of krb5 should update to these erratum packages, which contain     backported patches to correct these issues.  Red Hat would like to thank     the MIT Kerberos Development Team for their responsible disclosure of these     issues.

Tenable has extracted the preceding description block directly from the Red Hat Enterprise Linux security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

A vulnerability in the rcp protocol was discovered that allows a server to instruct a client to write arbitrary files outside of the current directory, which could potentially be a security concern if a user used rcp to copy files from a malicious server.

The updated packages have been patched to correct this problem.

Updated rsh packages that fix a theoretical security issue are now available.

This update has been rated as having low security impact by the Red Hat Security Response Team

The rsh package contains a set of programs that allow users to run commands on remote machines, login to other machines, and copy files between machines, using the rsh, rlogin, and rcp commands. All three of these commands use rhosts-style authentication.

The rcp protocol allows a server to instruct a client to write to arbitrary files outside of the current directory. This could potentially cause a security issue if a user uses rcp to copy files from a malicious server. The Common Vulnerabilities and Exposures project (cve.mitre.org) has assigned the name CVE-2004-0175 to this issue.

All users of rsh should upgrade to these updated packages, which resolve these issues.

The remote Redhat Enterprise Linux 4 host has packages installed that are affected by a vulnerability as referenced in the RHSA-2005:165 advisory.

    The rsh package contains a set of programs that allow users to run     commands on remote machines, login to other machines, and copy files     between machines, using the rsh, rlogin, and rcp commands. All three of     these commands use rhosts-style authentication.

    The rcp protocol allows a server to instruct a client to write to arbitrary     files outside of the current directory. This could potentially cause a     security issue if a user uses rcp to copy files from a malicious server.
    The Common Vulnerabilities and Exposures project (cve.mitre.org) has     assigned the name CAN-2004-0175 to this issue.

    These updated packages also address the following bugs:

    The rlogind server reported SIGCHLD set to SIG_IGN but calls wait()     message to the system log because the original BSD code was ported     incorrectly to linux.

    The rexecd server did not function on systems where client hostnames were     not in the DNS service, because server code called gethostbyaddr() for each     new connection.

    The rcp command incorrectly used the errno variable and produced     erroneous error messages.

    The rexecd command ignored settings in the /etc/security/limits file,     because the PAM session was incorrectly initialized.

    All users of rsh should upgrade to these updated packages, which resolve     these issues.

Tenable has extracted the preceding description block directly from the Red Hat Enterprise Linux security advisory.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

Updated openssh packages that fix a potential security vulnerability and various other bugs are now available for Red Hat Enterprise Linux 2.1.

This update has been rated as having low security impact by the Red Hat Security Response Team.

OpenSSH is OpenBSD's SSH (Secure SHell) protocol implementation. SSH replaces rlogin and rsh, and provides secure encrypted communications between two untrusted hosts over an insecure network. X11 connections and arbitrary TCP/IP ports can also be forwarded over a secure channel. Public key authentication can be used for 'passwordless' access to servers.

The scp protocol allows a server to instruct a client to write to arbitrary files outside of the current directory. This could potentially cause a security issue if a user uses scp to copy files from a malicious server. The Common Vulnerabilities and Exposures project (cve.mitre.org) has assigned the name CVE-2004-0175 to this issue.

These updated packages also correct the following bug :

On systems in which direct ssh access for the root user was disabled by configuration (setting 'PermitRootLogin no'), attempts to guess the root password could be judged as sucessful or unsucessful by observing a delay.

Users of openssh should upgrade to these updated packages, which contain backported patches to resolve these issues.

The remote host is missing Security Update 2004-09-07.  This security update fixes the following components :

  - CoreFoundation
  - IPSec
  - Kerberos
  - libpcap
  - lukemftpd
  - NetworkConfig
  - OpenLDAP
  - OpenSSH
  - PPPDialer
  - rsync
  - Safari
  - tcpdump

These applications contain multiple vulnerabilities that may allow a remote attacker to execute arbitrary code.

ID	Name	Product	Family	Severity
701170	OpenSSH < 3.4p1 scp Traversal Arbitrary File Overwrite	Nessus Network Monitor	SSH	medium
17701	OpenSSH < 3.4p1 scp Traversal Arbitrary File Overwrite	Nessus	Misc.	medium
55992	SunSSH < 1.1.1 / 1.3 CBC Plaintext Disclosure	Nessus	Misc.	critical
36260	Mandriva Linux Security Advisory : rsh (MDVSA-2008:191)	Nessus	Mandriva Local Security Checks	medium
21946	CentOS 4 : krb5 (CESA-2005:567)	Nessus	CentOS Local Security Checks	high
21920	CentOS 4 : rsh (CESA-2005:165)	Nessus	CentOS Local Security Checks	medium
21840	CentOS 3 : krb5 (CESA-2005:562)	Nessus	CentOS Local Security Checks	high
21798	CentOS 3 : openssh (CESA-2005:106)	Nessus	CentOS Local Security Checks	medium
21796	CentOS 3 : rsh (CESA-2005:074)	Nessus	CentOS Local Security Checks	medium
19201	Mandrake Linux Security Advisory : krb5 (MDKSA-2005:119)	Nessus	Mandriva Local Security Checks	high
18688	RHEL 4 : krb5 (RHSA-2005:567)	Nessus	Red Hat Local Security Checks	critical
18687	RHEL 2.1 / 3 : krb5 (RHSA-2005:562)	Nessus	Red Hat Local Security Checks	high
18497	Mandrake Linux Security Advisory : rsh (MDKSA-2005:100)	Nessus	Mandriva Local Security Checks	medium
18472	RHEL 2.1 : rsh (RHSA-2005:495)	Nessus	Red Hat Local Security Checks	medium
18442	RHEL 4 : rsh (RHSA-2005:165)	Nessus	Red Hat Local Security Checks	high
18423	RHEL 2.1 : openssh (RHSA-2005:481)	Nessus	Red Hat Local Security Checks	medium
18310	RHEL 3 : openssh (RHSA-2005:106)	Nessus	Red Hat Local Security Checks	medium
18309	RHEL 3 : rsh (RHSA-2005:074)	Nessus	Red Hat Local Security Checks	medium
14676	Mac OS X Multiple Vulnerabilities (Security Update 2004-09-07)	Nessus	MacOS X Local Security Checks	high

Detections

Analytics

CVE-2004-0175

high

Tenable Plugins

medium

medium

critical

medium

high

medium

high

medium

medium

high

critical

high

medium

medium

high

medium

medium

medium

high