Red Hat セキュリティアドバイザリ 2007:0095 から：

多数の問題を修正する更新済みの krb5 パッケージが、現在利用可能です。

Red Hat セキュリティレスポンスチームは、この更新には重大なセキュリティインパクトがあるものとして評価しています。

Kerberos は、クライアントとサーバーが対称キー暗号化、信頼できる第三者機関（TTP）、KDC を使用して相互に認証できるようにするネットワーク認証システムです。

MIT krb5 telnet デーモン（telnetd）のユーザー名の処理に、欠陥が見つかりました。ターゲットマシンの telnet ポートにアクセス可能なリモートの攻撃者が、パスワードを要求されることなく、root としてログインする可能性があります。
(CVE-2007-0956)

注意：Red Hat Enterprise Linux のどのバージョンでも、krb5 telnet デーモンはデフォルトで有効になっていません。また、デフォルトのファイアウォール規則により、 telnet ポートへのリモートアクセスがブロックされます。この欠陥は、telnet-server パッケージで配布される telnet デーモンに影響を与えません。

krb5 telnet デーモンを有効にし、これにリモートからアクセスできるユーザーは、この更新をすぐに適用する必要があります。

今回、欠陥が積極的に悪用されるとは認識していませんが、この欠陥の悪用が非常に容易であることを確認しています。

この更新は 2 つの追加のセキュリティ問題も修正します：

Kerberos KDC および kadmin サーバーデーモンに影響を与える、バッファオーバーフローが見つかりました。KDC にアクセスできるリモートの攻撃者が、このバグを悪用して、KDC または kadmin サーバープロセスの権限で任意のコードを実行する可能性があります。(CVE-2007-0957)

kadmin サーバーデーモンが使用する GSSAPI ライブラリに、二重解放の欠陥が見つかりました。Red Hat Enterprise Linux 4 および 5 に、二重解放の欠陥を検出する glibc 内でのチェックが含まれています。このため、Red Hat Enterprise Linux 4 および 5 でこの問題の悪用が成功しても、サービス拒否のみが引き起こされる可能性があります。Red Hat Enterprise Linux の初期のリリースでこのライブラリを使用するアプリケーションも、影響を受ける可能性があります。
(CVE-2007-1216)

全ユーザーは、バックポートされた修正が含まれるこれらのエラータパッケージへ更新し、これらの問題を修正することが推奨されます。

Red Hat は、これらの脆弱性を報告してくれた MIT および iDefense に感謝の意を表します。

來自 Red Hat 安全性公告 2007:0095：

現已提供更新版 krb5 套件，可修正數個問題。

Red Hat 安全性回應團隊已將此更新評等為具有重大安全性影響。

Kerberos 是一個網路驗證系統，其可讓用戶端與伺服器彼此透過使用對稱加密與信任的第三方 (即 KDC) 進行驗證。

在 MIT krb5 telnet 程序 (telnetd) 的使用者名稱處理中，發現一個瑕疵。凡是可存取目標電腦之 telnet 連接埠的遠端攻擊者，便能以 root 身分登入且無需密碼。
(CVE-2007-0956)

請注意，依預設不會在任何 Red Hat Enterprise Linux 版本中啟用 krb5 Telnet 程序。此外，預設防火牆規則會封鎖 telnet 連接埠的遠端存取。此瑕疵未影響在 telnet-server 套件中發佈的 telnet 程序。

已啟用 krb5 telnet 程序並從遠端存取的使用者應立即套用此更新。

儘管我們目前尚未發現任何此瑕疵遭到惡意利用的情況，但我們已確定該瑕疵很容易遭到入侵。

此更新也修正了兩個其他安全性問題：

發現影響 Kerberos KDC 和 kadmin 伺服器程序的緩衝區溢位。若遠端攻擊者可存取 KDC，即可惡意利用此錯誤，以 KDC 或 kadmind 伺服器處理程序的權限執行任意程式碼。(CVE-2007-0957)

在 kadmin 伺服器程序所使用的 GSSAPI 程式庫中，發現一個重複釋放瑕疵。Red Hat Enterprise Linux 4 和 5 包含 glibc 中偵測到重複釋放瑕疵的檢查。因此，在 Red Hat Enterprise Linux 4 和 5 上成功惡意利用此問題僅可導致拒絕服務。使用更舊版 Red Hat Enterprise Linux 內此程式庫的應用程式也可能會受到影響。
(CVE-2007-1216)

建議所有使用者皆更新至這些錯字勘誤表套件，其中包含可更正這些問題的反向移植修正。

Red Hat 要感謝 MIT 和 iDefense 報告這些弱點。

来自 Red Hat 安全公告 2007:0095：

更新后的 krb5 程序包修复了许多问题，现在可用。

Red Hat 安全响应团队将此更新评级为具有严重安全影响。

Kerberos 是一套网络认证系统，允许客户端和服务器通过使用对称加密和受信任的第三方（即 KDC）对彼此进行认证。

在 MIT krb5 telnet 后台程序 (telnetd) 的用户名处理中发现一个缺陷。能够访问目标计算机 telnet 端口的远程攻击者可以以根用户身份登入而无需密码。
(CVE-2007-0956)

请注意，krb5 telnet 后台程序默认在任何 Red Hat Enterprise Linux 版本中均不启用。此外，默认防火墙规则阻止远程访问 telnet 端口。此缺陷不影响 telnet-server 程序包中分发的 telnet 后台程序。

对于启用了 krb5 telnet 后台程序并使其可远程访问的用户，应立即应用此更新。

尽管我们不知道该缺陷目前是否已被主动利用，但我们确认该缺陷非常容易被利用。

此更新还修复了两个额外的安全问题：

发现可影响 Kerberos KDC 和 kadmin 服务器后台程序的缓冲区溢出。可访问 KDC 的远程攻击者可利用此缺陷以 KDC 或 kadmin 服务器进程的权限运行任意代码。(CVE-2007-0957)

在 kadmin 服务器后台程序使用的 GSSAPI 库中发现一个双重释放缺陷。Red Hat Enterprise Linux 4 和 5 包含 glibc 内可检测双重释放缺陷的检查。因此，在 Red Hat Enterprise Linux 4 和 5 中成功利用此问题只能导致拒绝服务。Red Hat Enterprise Linux 早期版本中使用此库的应用程序也可能受到影响。
(CVE-2007-1216)

建议所有用户更新这些勘误表程序包，其中包含用于修正这些问题的向后移植的补丁。

Red Hat 在此感谢 MIT 和 iDefense 报告这些漏洞。

A bug in the function krb5_klog_syslog() leads to a buffer overflow which could be exploited to execute arbitrary code. (CVE-2007-0957)

A double-free bug in the GSS-API library could crash kadmind. It's potentially also exploitable to execute arbitrary code.
(CVE-2007-1216)

The remote host is running a version of Mac OS X 10.4 that does not have Security Update 2007-004 applied.

This update fixes security flaws in the following applications :

AFP Client AirPort CarbonCore diskdev_cmds fetchmail ftpd gnutar Help Viewer HID Family Installer Kerberos Libinfo Login Window network_cmds SMB System Configuration URLMount Video Conference WebDAV

The remote host is affected by the vulnerability described in GLSA-200704-02 (MIT Kerberos 5: Arbitrary remote code execution)

    The Kerberos telnet daemon fails to properly handle usernames allowing     unauthorized access to any account (CVE-2007-0956). The Kerberos     administration daemon, the KDC and possibly other applications using     the MIT Kerberos libraries are vulnerable to the following issues. The     krb5_klog_syslog function from the kadm5 library fails to properly     validate input leading to a stack overflow (CVE-2007-0957). The GSS-API     library is vulnerable to a double-free attack (CVE-2007-1216).
  Impact :

    By exploiting the telnet vulnerability a remote attacker may obtain     access with root privileges. The remaining vulnerabilities may allow an     authenticated remote attacker to execute arbitrary code with root     privileges.
  Workaround :

    There is no known workaround at this time.

Updated krb5 packages that fix a number of issues are now available.

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

Kerberos is a network authentication system which allows clients and servers to authenticate to each other through use of symmetric encryption and a trusted third party, the KDC.

A flaw was found in the username handling of the MIT krb5 telnet daemon (telnetd). A remote attacker who can access the telnet port of a target machine could log in as root without requiring a password.
(CVE-2007-0956)

Note that the krb5 telnet daemon is not enabled by default in any version of Red Hat Enterprise Linux. In addition, the default firewall rules block remote access to the telnet port. This flaw does not affect the telnet daemon distributed in the telnet-server package.

For users who have enabled the krb5 telnet daemon and have it accessible remotely, this update should be applied immediately.

Whilst we are not aware at this time that the flaw is being actively exploited, we have confirmed that the flaw is very easily exploitable.

This update also fixes two additional security issues :

Buffer overflows were found which affect the Kerberos KDC and the kadmin server daemon. A remote attacker who can access the KDC could exploit this bug to run arbitrary code with the privileges of the KDC or kadmin server processes. (CVE-2007-0957)

A double-free flaw was found in the GSSAPI library used by the kadmin server daemon. Red Hat Enterprise Linux 4 and 5 contain checks within glibc that detect double-free flaws. Therefore, on Red Hat Enterprise Linux 4 and 5 successful exploitation of this issue can only lead to a denial of service. Applications which use this library in earlier releases of Red Hat Enterprise Linux may also be affected.
(CVE-2007-1216)

All users are advised to update to these erratum packages which contain a backported fix to correct these issues.

Red Hat would like to thank MIT and iDefense for reporting these vulnerabilities.

A bug in the function krb5_klog_syslog() leads to a buffer overflow which could be exploited to execute arbitrary code (CVE-2007-0957).

A double-free bug in the GSS-API library could crash kadmind. It's potentially also exploitable to execute arbitrary code (CVE-2007-1216).

The remote Oracle Linux 5 host has packages installed that are affected by multiple vulnerabilities as referenced in the ELSA-2007-0095 advisory.

    [1.3.4-46]
     - fix bug ID in changelog

     [1.3.4-45]
     - add preliminary patch to fix buffer overflow in krb5kdc and kadmind        (#231528, CVE-2007-0957)
     - add preliminary patch to fix double-free in kadmind (#231537, CVE-2007-1216)

     [1.3.4-44]
     - temporarily disable bug fixes for #143289, #179062, #180671, #202191, #223669        for security update
     - add preliminary patch to correct unauthorized access via krb5-aware telnet        daemon (#229782, CVE-2007-0956)

     [1.3.4-43]
     - re-enable fixes for #143289, #223669 and rebuild

     [1.3.4-42]
     - temporarily back out fixes for #143289, #223669 and rebuild

     [1.3.4-41]
     - update rcp non-fatal error patch to fix hangs on write errors, too (Jose        Plans, #223669)

     [1.3.4-40]
     - report a non-fatal error to the remote rcp when the client fails to open a        file for writing (#223669)

     [1.3.4-39]
     - refrain from killing any lingering members of our child's process group when        logging that the child process has exited (Jose Plans, #143289)

     [1.3.4-38]
     - correct syntax error in krb5-config.sh

     [1.3.4-37]
     - update to revised upstream patches for CVE-2006-3083 and CVE-2006-3084        (MITKRB5-SA-2006-001) to avoid unnecessary error messages from ksu (#209512)

     [1.3.4-36]
     - add missing shebang headers to krsh and krlogin wrapper scripts (#209238)

     [1.3.4-35]
     - backport changes to make krb5-devel multilib-safe (#202191, prereq for

     [1.3.4-34]
     - reapply changes for #198633, #179062, #180671

     [1.3.4-33]
     - temporarily revert changes for #198633

     [ 1.3.4-32]
     - rebuild

     [1.3.4-31]
     - temporarily revert changes for #179062
     - temporarily revert changes for #180671
     - apply patch to fix unchecked calls to setuid() (CVE-2006-3083) and        seteuid() (CVE-2006-3084) (#197818)

     [1.3.4-30]
     - incorporate fixes for hangs in the rsh client and server (#198633)

     [1.3.4-29]
     - if we fail to determine the name of a master KDC in        krb5_get_init_creds_keytab(), return the error we got from the non-master        rather than the can't-determine-the-name error, which isn't so useful,        matching the current release's behavior (#180671)

     [1.3.4-28]
     - reenable the fix for #179062

Tenable has extracted the preceding description block directly from the Oracle 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 was found in the username handling of the MIT krb5 telnet daemon. A remote attacker that could access the telnet port of a target machine could login as root without requiring a password (CVE-2007-0956).

Buffer overflows in the kadmin server daemon were discovered that could be exploited by a remote attacker able to access the KDC.
Successful exploitation could allow for the execution of arbitrary code with the privileges of the KDC or kadmin server processes (CVE-2007-0957).

Finally, a double-free flaw was discovered in the GSSAPI library used by the kadmin server daemon, which could lead to a denial of service condition or the execution of arbitrary code with the privileges of the KDC or kadmin server processes (CVE-2007-1216).

Updated packages have been patched to address this issue.

Update :

Packages for Mandriva Linux 2007.1 are now available.

Several remote vulnerabilities have been discovered in the MIT reference implementation of the Kerberos network authentication protocol suite, which may lead to the execution of arbitrary code. The Common Vulnerabilities and Exposures project identifies the following problems :

  - CVE-2007-0956     It was discovered that the krb5 telnet daemon performs     insufficient validation of usernames, which might allow     unauthorized logins or privilege escalation.

  - CVE-2007-0957     iDefense discovered that a buffer overflow in the     logging code of the KDC and the administration daemon     might lead to arbitrary code execution.

  - CVE-2007-1216     It was discovered that a double free in the RPCSEC_GSS     part of the GSS library code might lead to arbitrary     code execution.

The krb5 telnet service did not appropriately verify user names. A remote attacker could log in as the root user by requesting a specially crafted user name. (CVE-2007-0956)

The krb5 syslog library did not correctly verify the size of log messages. A remote attacker could send a specially crafted message and execute arbitrary code with root privileges. (CVE-2007-0957)

The krb5 administration service was vulnerable to a double-free in the GSS RPC library. A remote attacker could send a specially crafted request and execute arbitrary code with root privileges.
(CVE-2007-1216).

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.

SunOS 5.8: kpasswd, libgss.so.1 and libkad.
Date this patch was last updated by Sun : Aug/03/07

SunOS 5.8_x86: kpasswd, libgss.so.1 and li.
Date this patch was last updated by Sun : Aug/10/07

ID	名称	产品	系列	发布时间	最近更新时间	严重程度
67458	Oracle Linux 3/4/5：krb5（ELSA-2007-0095）	Nessus	Oracle Linux Local Security Checks	2013/7/12	2024/10/22	critical
67458	Oracle Linux 3 / 4 / 5 : krb5 (ELSA-2007-0095)	Nessus	Oracle Linux Local Security Checks	2013/7/12	2024/10/22	critical
67458	Oracle Linux 3 / 4 / 5：krb5 (ELSA-2007-0095)	Nessus	Oracle Linux Local Security Checks	2013/7/12	2024/10/22	critical
29492	SuSE 10 Security Update : Kerberos 5 (ZYPP Patch Number 3046)	Nessus	SuSE Local Security Checks	2007/12/13	2021/1/14	high
25081	Mac OS X Multiple Vulnerabilities (Security Update 2007-004)	Nessus	MacOS X Local Security Checks	2007/4/21	2024/5/28	critical
24935	GLSA-200704-02 : MIT Kerberos 5: Arbitrary remote code execution	Nessus	Gentoo Local Security Checks	2007/4/5	2021/1/6	high
24948	RHEL 2.1 / 3 / 4 / 5 : krb5 (RHSA-2007:0095)	Nessus	Red Hat Local Security Checks	2007/4/5	2021/1/14	high
27308	openSUSE 10 Security Update : krb5 (krb5-3045)	Nessus	SuSE Local Security Checks	2007/10/17	2021/1/14	high
67458	Oracle Linux 5 : Critical: / krb5 (ELSA-2007-0095)	Nessus	Oracle Linux Local Security Checks	2013/7/12	2024/10/22	critical
24919	CentOS 3 / 4 : krb5 (CESA-2007:0095)	Nessus	CentOS Local Security Checks	2007/4/5	2021/1/4	high
24943	Mandrake Linux Security Advisory : krb5 (MDKSA-2007:077-1)	Nessus	Mandriva Local Security Checks	2007/4/5	2021/1/6	high
25010	Debian DSA-1276-1 : krb5 - several vulnerabilities	Nessus	Debian Local Security Checks	2007/4/10	2021/1/4	high
28046	Ubuntu 5.10 / 6.06 LTS / 6.10 : krb5 vulnerabilities (USN-449-1)	Nessus	Ubuntu Local Security Checks	2007/11/10	2021/1/19	high
18068	Solaris 8 (sparc) : 109223-10	Nessus	Solaris Local Security Checks	2005/4/17	2021/1/14	high
18070	Solaris 8 (x86) : 109224-10	Nessus	Solaris Local Security Checks	2005/4/17	2021/1/14	high

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