Updated openssh packages that fix a security issue, a bug, and add enhancements are now available for Red Hat Enterprise Linux 5.

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. These packages include the core files necessary for both the OpenSSH client and server.

A flaw was found in the SSH protocol. An attacker able to perform a man-in-the-middle attack may be able to obtain a portion of plain text from an arbitrary ciphertext block when a CBC mode cipher was used to encrypt SSH communication. This update helps mitigate this attack:
OpenSSH clients and servers now prefer CTR mode ciphers to CBC mode, and the OpenSSH server now reads SSH packets up to their full possible length when corruption is detected, rather than reporting errors early, reducing the possibility of successful plain text recovery.
(CVE-2008-5161)

This update also fixes the following bug :

* the ssh client hung when trying to close a session in which a background process still held tty file descriptors open. With this update, this so-called 'hang on exit' error no longer occurs and the ssh client closes the session immediately. (BZ#454812)

In addition, this update adds the following enhancements :

* the SFTP server can now chroot users to various directories, including a user's home directory, after log in. A new configuration option -- ChrootDirectory -- has been added to '/etc/ssh/sshd_config' for setting this up (the default is not to chroot users). Details regarding configuring this new option are in the sshd_config(5) manual page. (BZ#440240)

* the executables which are part of the OpenSSH FIPS module which is being validated will check their integrity and report their FIPS mode status to the system log or to the terminal. (BZ#467268, BZ#492363)

All OpenSSH users are advised to upgrade to these updated packages, which contain backported patches to resolve these issues and add these enhancements. After installing this update, the OpenSSH server daemon (sshd) will be restarted automatically.

The version of AHV installed on the remote host is prior to 20230302.102005. It is, therefore, affected by multiple vulnerabilities as referenced in the NXSA-AHV-20230302.1011 advisory.

  - Error handling in the SSH protocol in (1) SSH Tectia Client and Server and Connector 4.0 through 4.4.11,     5.0 through 5.2.4, and 5.3 through 5.3.8; Client and Server and ConnectSecure 6.0 through 6.0.4; Server     for Linux on IBM System z 6.0.4; Server for IBM z/OS 5.5.1 and earlier, 6.0.0, and 6.0.1; and Client 4.0-J     through 4.3.3-J and 4.0-K through 4.3.10-K; and (2) OpenSSH 4.7p1 and possibly other versions, when using     a block cipher algorithm in Cipher Block Chaining (CBC) mode, makes it easier for remote attackers to     recover certain plaintext data from an arbitrary block of ciphertext in an SSH session via unknown     vectors. (CVE-2008-5161)

  - The PKCS#11 feature in ssh-agent in OpenSSH before 9.3p2 has an insufficiently trustworthy search path,     leading to remote code execution if an agent is forwarded to an attacker-controlled system. (Code in     /usr/lib is not necessarily safe for loading into ssh-agent.) NOTE: this issue exists because of an     incomplete fix for CVE-2016-10009. (CVE-2023-38408)

  - A NULL pointer dereference was found In libssh during re-keying with algorithm guessing. This issue may     allow an authenticated client to cause a denial of service. (CVE-2023-1667)

  - A vulnerability was found in libssh, where the authentication check of the connecting client can be     bypassed in the`pki_verify_data_signature` function in memory allocation problems. This issue may happen     if there is insufficient memory or the memory usage is limited. The problem is caused by the return value     `rc,` which is initialized to SSH_ERROR and later rewritten to save the return value of the function call     `pki_key_check_hash_compatible.` The value of the variable is not changed between this point and the     cryptographic verification. Therefore any error between them calls `goto error` returning SSH_OK.
    (CVE-2023-2283)

  - Every `named` instance configured to run as a recursive resolver maintains a cache database holding the     responses to the queries it has recently sent to authoritative servers. The size limit for that cache     database can be configured using the `max-cache-size` statement in the configuration file; it defaults to     90% of the total amount of memory available on the host. When the size of the cache reaches 7/8 of the     configured limit, a cache-cleaning algorithm starts to remove expired and/or least-recently used RRsets     from the cache, to keep memory use below the configured limit. It has been discovered that the     effectiveness of the cache-cleaning algorithm used in `named` can be severely diminished by querying the     resolver for specific RRsets in a certain order, effectively allowing the configured `max-cache-size`     limit to be significantly exceeded. This issue affects BIND 9 versions 9.11.0 through 9.16.41, 9.18.0     through 9.18.15, 9.19.0 through 9.19.13, 9.11.3-S1 through 9.16.41-S1, and 9.18.11-S1 through 9.18.15-S1.
    (CVE-2023-2828)

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

The remote host is affected by the vulnerability described in GLSA-201405-06 (OpenSSH: Multiple vulnerabilities)

    Multiple vulnerabilities have been discovered in OpenSSH. Please review       the CVE identifiers referenced below for details.
  Impact :

    A remote attacker could execute arbitrary code, cause a Denial of       Service condition, obtain sensitive information, or bypass environment       restrictions.
  Workaround :

    There is no known workaround at this time.

The remote Oracle Linux 5 host has packages installed that are affected by a vulnerability as referenced in the ELSA-2009-1287 advisory.

    - workaround to plaintext recovery attack against CBC ciphers CVE-2008-5161 (#502230)

Tenable has extracted the preceding description block directly from the Oracle 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.

The version of OpenSSH running on the remote host is affected by the following vulnerabilities :

  - X11 man-in-the-middle attack:
    When attempting to bind(2) to a port that has previously     been bound with SO_REUSEADDR set, most operating systems     check that either the effective user-id matches the     previous bind (common on BSD-derived systems) or that     the bind addresses do not overlap. When the     sshd_config(5) option X11UseLocalhost has been set to     'no' - an attacker may establish a more-specific bind,     which will be used in preference to sshd's wildcard     listener. (CVE-2008-3259)

  - Plaintext Recovery Attack Against SSH:
    If exploited, this attack can potentially allow an     attacker to recover up to 32 bits of plaintext from an     arbitrary block of ciphertext from a connection secured     using the SSH protocol in the standard configuration.
    If OpenSSH is used in the standard configuration, then     the attacker's success probability for recovering 32     bits of plaintext is 2^{-18}. A variant of the attack     against OpenSSH in the standard configuration can     verifiably recover 14 bits of plaintext with probability     2^{-14}. The success probability of the attack for other     implementations of SSH is not known. (CVE-2008-5161)

The version of AHV installed on the remote host is prior to AHV-10.0. It is, therefore, affected by multiple vulnerabilities as referenced in the NXSA-AHV-10.0 advisory.

  - A crafted NTFS image can trigger a heap-based buffer overflow, caused by an unsanitized attribute in     ntfs_get_attribute_value, in NTFS-3G < 2021.8.22. (CVE-2021-39263)

  - An issue was discovered in libexpat before 2.6.3. nextScaffoldPart in xmlparse.c can have an integer     overflow for m_groupSize on 32-bit platforms (where UINT_MAX equals SIZE_MAX). (CVE-2024-45492)

  - Flatpak is a Linux application sandboxing and distribution framework. Prior to versions 1.14.0 and     1.15.10, a malicious or compromised Flatpak app using persistent directories could access and write files     outside of what it would otherwise have access to, which is an attack on integrity and confidentiality.
    When `persistent=subdir` is used in the application permissions (represented as `--persist=subdir` in the     command-line interface), that means that an application which otherwise doesn't have access to the real     user home directory will see an empty home directory with a writeable subdirectory `subdir`. Behind the     scenes, this directory is actually a bind mount and the data is stored in the per-application directory as     `~/.var/app/$APPID/subdir`. This allows existing apps that are not aware of the per-application directory     to still work as intended without general home directory access. However, the application does have write     access to the application directory `~/.var/app/$APPID` where this directory is stored. If the source     directory for the `persistent`/`--persist` option is replaced by a symlink, then the next time the     application is started, the bind mount will follow the symlink and mount whatever it points to into the     sandbox. Partial protection against this vulnerability can be provided by patching Flatpak using the     patches in commits ceec2ffc and 98f79773. However, this leaves a race condition that could be exploited by     two instances of a malicious app running in parallel. Closing the race condition requires updating or     patching the version of bubblewrap that is used by Flatpak to add the new `--bind-fd` option using the     patch and then patching Flatpak to use it. If Flatpak has been configured at build-time with     `-Dsystem_bubblewrap=bwrap` (1.15.x) or `--with-system-bubblewrap=bwrap` (1.14.x or older), or a similar     option, then the version of bubblewrap that needs to be patched is a system copy that is distributed     separately, typically `/usr/bin/bwrap`. This configuration is the one that is typically used in Linux     distributions. If Flatpak has been configured at build-time with `-Dsystem_bubblewrap=` (1.15.x) or with     `--without-system-bubblewrap` (1.14.x or older), then it is the bundled version of bubblewrap that is     included with Flatpak that must be patched. This is typically installed as `/usr/libexec/flatpak-bwrap`.
    This configuration is the default when building from source code. For the 1.14.x stable branch, these     changes are included in Flatpak 1.14.10. The bundled version of bubblewrap included in this release has     been updated to 0.6.3. For the 1.15.x development branch, these changes are included in Flatpak 1.15.10.
    The bundled version of bubblewrap in this release is a Meson wrap subproject, which has been updated to     0.10.0. The 1.12.x and 1.10.x branches will not be updated for this vulnerability. Long-term support OS     distributions should backport the individual changes into their versions of Flatpak and bubblewrap, or     update to newer versions if their stability policy allows it. As a workaround, avoid using applications     using the `persistent` (`--persist`) permission. (CVE-2024-42472)

  - Certain DNSSEC aspects of the DNS protocol (in RFC 4033, 4034, 4035, 6840, and related RFCs) allow remote     attackers to cause a denial of service (CPU consumption) via one or more DNSSEC responses, aka the     KeyTrap issue. One of the concerns is that, when there is a zone with many DNSKEY and RRSIG records, the     protocol specification implies that an algorithm must evaluate all combinations of DNSKEY and RRSIG     records. (CVE-2023-50387)

  - The Closest Encloser Proof aspect of the DNS protocol (in RFC 5155 when RFC 9276 guidance is skipped)     allows remote attackers to cause a denial of service (CPU consumption for SHA-1 computations) via DNSSEC     responses in a random subdomain attack, aka the NSEC3 issue. The RFC 5155 specification implies that an     algorithm must perform thousands of iterations of a hash function in certain situations. (CVE-2023-50868)

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

SunOS 5.9: Kernel Patch.
Date this patch was last updated by Sun : Nov/03/11

SunOS 5.9_x86: Kernel Patch.
Date this patch was last updated by Sun : Nov/03/11

The version of OpenSSH 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.

The remote MiracleLinux 3 host has packages installed that are affected by a vulnerability as referenced in the AXSA:2009-395:02 advisory.

    SSH (Secure SHell) is a program for logging into and executing commands on a remote machine. SSH is     intended to replace rlogin and rsh, and to provide secure encrypted communications between two untrusted     hosts over an insecure network. X11 connections and arbitrary TCP/IP ports can also be forwarded over the     secure channel.
    OpenSSH is OpenBSD's version of the last free version of SSH, bringing it up to date in terms of security     and features, as well as removing all patented algorithms to separate libraries.
    This package includes the core files necessary for both the OpenSSH client and server. To make this     package useful, you should also install openssh-clients, openssh-server, or both.
    Fixed bugs:
    CVE-2008-5161     Error handling in the SSH protocol in (1) SSH Tectia Client and Server and Connector 4.0 through 4.4.11,     5.0 through 5.2.4, and 5.3 through 5.3.8; Client and Server and ConnectSecure 6.0 through 6.0.4; Server     for Linux on IBM System z 6.0.4; Server for IBM z/OS 5.5.1 and earlier, 6.0.0, and 6.0.1; and Client 4.0-J     through 4.3.3-J and 4.0-K through 4.3.10-K; and (2) OpenSSH 4.7p1 and possibly other versions, when using     a block cipher algorithm in Cipher Block Chaining (CBC) mode, makes it easier for remote attackers to     recover certain plaintext data from an arbitrary block of ciphertext in an SSH session via unknown     vectors.

Tenable has extracted the preceding description block directly from the MiracleLinux security advisory.

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

The remote Redhat Enterprise Linux 5 host has packages installed that are affected by a vulnerability as referenced in the RHSA-2009:1287 advisory.

    OpenSSH is OpenBSD's SSH (Secure Shell) protocol implementation. These     packages include the core files necessary for both the OpenSSH client and     server.

    A flaw was found in the SSH protocol. An attacker able to perform a     man-in-the-middle attack may be able to obtain a portion of plain text from     an arbitrary ciphertext block when a CBC mode cipher was used to encrypt     SSH communication. This update helps mitigate this attack: OpenSSH clients     and servers now prefer CTR mode ciphers to CBC mode, and the OpenSSH server     now reads SSH packets up to their full possible length when corruption is     detected, rather than reporting errors early, reducing the possibility of     successful plain text recovery. (CVE-2008-5161)

    This update also fixes the following bug:

    * the ssh client hung when trying to close a session in which a background     process still held tty file descriptors open. With this update, this     so-called hang on exit error no longer occurs and the ssh client closes     the session immediately. (BZ#454812)

    In addition, this update adds the following enhancements:

    * the SFTP server can now chroot users to various directories, including     a user's home directory, after log in. A new configuration option --     ChrootDirectory -- has been added to /etc/ssh/sshd_config for setting     this up (the default is not to chroot users). Details regarding configuring     this new option are in the sshd_config(5) manual page. (BZ#440240)

    * the executables which are part of the OpenSSH FIPS module which is being     validated will check their integrity and report their FIPS mode status to     the system log or to the terminal. (BZ#467268, BZ#492363)

    All OpenSSH users are advised to upgrade to these updated packages, which     contain backported patches to resolve these issues and add these     enhancements. After installing this update, the OpenSSH server daemon     (sshd) will be restarted automatically.

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.

The remote host is running a version of Mac OS X 10.5 that does not have Security Update 2009-006 applied.

This security update contains fixes for the following products :

  - AFP Client
  - Adaptive Firewall
  - Apache
  - Apache Portable Runtime
  - ATS
  - Certificate Assistant
  - CoreGraphics
  - CUPS
  - Dictionary
  - DirectoryService
  - Disk Images
  - Event Monitor
  - fetchmail
  - FTP Server
  - Help Viewer
  - International Components for Unicode
  - IOKit
  - IPSec
  - libsecurity
  - libxml
  - OpenLDAP
  - OpenSSH
  - PHP
  - QuickDraw Manager
  - QuickLook
  - FreeRADIUS
  - Screen Sharing
  - Spotlight
  - Subversion

The version of AHV installed on the remote host is prior to 20230302.102005. It is, therefore, affected by multiple vulnerabilities as referenced in the NXSA-AHV-20230302.100173 advisory.

  - A crafted NTFS image can trigger a heap-based buffer overflow, caused by an unsanitized attribute in     ntfs_get_attribute_value, in NTFS-3G < 2021.8.22. (CVE-2021-39263)

  - EDK2's Network Package is susceptible to a buffer overflow vulnerability when processing DNS Servers     option from a DHCPv6 Advertise message. This vulnerability can be exploited by an attacker to gain     unauthorized access and potentially lead to a loss of Confidentiality, Integrity and/or Availability.
    (CVE-2023-45234)

  - A NULL pointer dereference was found In libssh during re-keying with algorithm guessing. This issue may     allow an authenticated client to cause a denial of service. (CVE-2023-1667)

  - A vulnerability was found in libssh, where the authentication check of the connecting client can be     bypassed in the`pki_verify_data_signature` function in memory allocation problems. This issue may happen     if there is insufficient memory or the memory usage is limited. The problem is caused by the return value     `rc,` which is initialized to SSH_ERROR and later rewritten to save the return value of the function call     `pki_key_check_hash_compatible.` The value of the variable is not changed between this point and the     cryptographic verification. Therefore any error between them calls `goto error` returning SSH_OK.
    (CVE-2023-2283)

  - A vulnerability was found that the response times to malformed ciphertexts in RSA-PSK ClientKeyExchange     differ from response times of ciphertexts with correct PKCS#1 v1.5 padding. (CVE-2023-5981)

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

The version of AHV installed on the remote host is prior to 20230302.102005. It is, therefore, affected by multiple vulnerabilities as referenced in the NXSA-AHV-20230302.207 advisory.

  - In Expat (aka libexpat) before 2.4.3, a left shift by 29 (or more) places in the storeAtts function in     xmlparse.c can lead to realloc misbehavior (e.g., allocating too few bytes, or only freeing memory).
    (CVE-2021-45960)

  - The PKCS#11 feature in ssh-agent in OpenSSH before 9.3p2 has an insufficiently trustworthy search path,     leading to remote code execution if an agent is forwarded to an attacker-controlled system. (Code in     /usr/lib is not necessarily safe for loading into ssh-agent.) NOTE: this issue exists because of an     incomplete fix for CVE-2016-10009. (CVE-2023-38408)

  - An arbitrary file write vulnerability was found in GNU gzip's zgrep utility. When zgrep is applied on the     attacker's chosen file name (for example, a crafted file name), this can overwrite an attacker's content     to an arbitrary attacker-selected file. This flaw occurs due to insufficient validation when processing     filenames with two or more newlines where selected content and the target file names are embedded in     crafted multi-line file names. This flaw allows a remote, low privileged attacker to force zgrep to write     arbitrary files on the system. (CVE-2022-1271)

  - http.client in Python 3.x before 3.5.10, 3.6.x before 3.6.12, 3.7.x before 3.7.9, and 3.8.x before 3.8.5     allows CRLF injection if the attacker controls the HTTP request method, as demonstrated by inserting CR     and LF control characters in the first argument of HTTPConnection.request. (CVE-2020-26116)

  - urllib3 before 1.25.9 allows CRLF injection if the attacker controls the HTTP request method, as     demonstrated by inserting CR and LF control characters in the first argument of putrequest(). NOTE: this     is similar to CVE-2020-26116. (CVE-2020-26137)

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

ID	名称	产品	系列	发布时间	最近更新时间	严重程度
43781	CentOS 5 : openssh (CESA-2009:1287)	Nessus	CentOS Local Security Checks	2010/1/6	2021/1/4	low
187269	Nutanix AHV : Multiple Vulnerabilities (NXSA-AHV-20230302.1011)	Nessus	Misc.	2023/12/22	2025/2/19	low
73958	GLSA-201405-06 : OpenSSH: Multiple vulnerabilities	Nessus	Gentoo Local Security Checks	2014/5/12	2021/1/6	medium
180625	Oracle Linux 5 : openssh (ELSA-2009-1287)	Nessus	Oracle Linux Local Security Checks	2023/9/7	2025/4/29	low
73557	AIX OpenSSH Advisory: openssh_advisory.asc	Nessus	AIX Local Security Checks	2014/4/16	2023/4/21	low
310786	Nutanix AHV : Multiple Vulnerabilities (NXSA-AHV-10.0)	Nessus	Misc.	2026/4/29	2026/4/30	medium
24858	Solaris 9 (sparc) : 122300-61	Nessus	Solaris Local Security Checks	2007/3/18	2021/1/14	high
24861	Solaris 9 (x86) : 122301-61	Nessus	Solaris Local Security Checks	2007/3/18	2021/1/14	high
44065	OpenSSH < 5.2 CBC Plaintext Disclosure	Nessus	Misc.	2011/9/27	2024/3/27	medium
284114	MiracleLinux 3 : openssh-4.3p2-29.2AXS3 (AXSA:2009-395:02)	Nessus	Miracle Linux Local Security Checks	2026/1/14	2026/1/14	low
40837	RHEL 5 : openssh (RHSA-2009:1287)	Nessus	Red Hat Local Security Checks	2009/9/2	2024/11/4	critical
42433	Mac OS X Multiple Vulnerabilities (Security Update 2009-006)	Nessus	MacOS X Local Security Checks	2009/11/9	2024/5/28	critical
206823	Nutanix AHV : Multiple Vulnerabilities (NXSA-AHV-20230302.100173)	Nessus	Misc.	2024/9/9	2025/2/17	low
180469	Nutanix AHV : Multiple Vulnerabilities (NXSA-AHV-20230302.207)	Nessus	Misc.	2023/9/4	2026/1/21	low

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