※ 本文转录自 [Lan] 信箱 作者: [email protected] (TWCERT/CC Fellows) 标题: 【TWCERT/CC安全通报】TW-CA-2005-030-[Sun(sm) A 时间: Tue Mar 22 16:06:13 2005 -----BEGIN PGP SIGNED MESSAGE----- TW-CA-2005-030-[Sun(sm) Alert Notification #57710: Security Vulnerability in the newgrp(1) Command May Allow Unauthorized Root Privileges] ──────────────────────────────────────── TWCERT/CC发布日期：2005-03-22 原漏洞发布日期：2005-03-16 原漏洞最新更新日期：-- 通用安全漏洞编号： 分类：Gain Privilege 来源参考：Sun(sm) Alert Notification #57710 ──── 简述 ───────────────────────────────── ──── 说明 ───────────────────────────────── newgrp(1)存在一个缓冲区溢位弱点，可能允许本地端未经授权的使用者取得root权限。 ──── 影响平台 ─────────────────────────────── 此议题可能影响下列发行版本： SPARC 平台 ‧未安装 118737-01 或更新版本修正档的 Solaris 7 ‧未安装 116993-01 或更新版本修正档的 Solaris 8 ‧未安装 117445-01 或更新版本修正档的 Solaris 9 x86 平台 ‧未安装 118738-01 或更新版本修正档的 Solaris 7 ‧未安装 116994-01 或更新版本修正档的 Solaris 8 ‧未安装 117446-01 或更新版本修正档的 Solaris 9 注意：Solaris 10 不受本议题影响。 ──── 修正方式 ─────────────────────────────── 暂时解决方法： 要暂时解决本议题的安全问题，在安装修正档之前，可先暂时移除newgrp(1)公用程式 的"setuid"权限，下列指令可完成上述工作： # chmod u-s /usr/bin/newgrp 注意：从newgrp(1)公用程式移除set-user-ID bit可预防利用来自newgrp(1)命令的未经 授权使用者。 解决方法： 此议题已於下列版本中解决： SPARC 平台 ‧安装 118737-01 或更新版本修正档的 Solaris 7 ‧安装 116993-01 或更新版本修正档的 Solaris 8 ‧安装 117445-01 或更新版本修正档的 Solaris 9 x86 平台 ‧安装 118738-01 或更新版本修正档的 Solaris 7 ‧安装 116994-01 或更新版本修正档的 Solaris 8 ‧安装 117446-01 或更新版本修正档的 Solaris 9 ──── 影响结果 ─────────────────────────────── 目前尚无可预期的徵兆显示上述议题已遭受利用。 ──── 联络TWCERT/CC ───────────────────────────── Tel: 886-7-5250211 FAX: 886-7-5250212 886-2-23563303 886-2-23924082 Email: [email protected] URL: http://www.cert.org.tw/ PGP key: http://www.cert.org.tw/eng/pgp.htm ──────────────────────────────────────── 附件：[Security Vulnerability in the newgrp(1) Command May Allow Unauthorized Root Privileges] ──── 原文 ───────────────────────────────── Sun(sm) Alert Notification Sun Alert ID: 57710 Synopsis: Security Vulnerability in the newgrp(1) Command May Allow Unauthorized Root Privileges Category: Security Product: Solaris BugIDs: 4705393 Avoidance: Workaround, Patch State: Resolved Date Released: 16-Mar-2005 Date Closed: 16-Mar-2005 Date Modified: 1. Impact A buffer overflow in newgrp(1) may allow a local unprivileged user the ability to gain root privileges. 2. Contributing Factors This issue can occur in the following releases: SPARC Platform Solaris 7 without patch 118737-01 Solaris 8 without patch 116993-01 Solaris 9 without patch 117445-01 x86 Platform Solaris 7 without patch 118738-01 Solaris 8 without patch 116994-01 Solaris 9 without patch 117446-01 Note: Solaris 10 is not affected by this issue. 3. Symptoms There are no predictable symptoms that would indicate the described issue has been exploited. Solution Summary Top 4. Relief/Workaround To work around the described issue, sites may wish to remove the "setuid" permissions from the newgrp(1) utility until patches can be applied to the system. This can be done by issuing the following command: # chmod u-s /usr/bin/newgrp Note:Removing the set-user-ID bit from the newgrp(1) utility will prevent unprivileged users from using the newgrp(1) command. 5. Resolution This issue is addressed in the following releases: SPARC Platform Solaris 7 with patch 118737-01 or later Solaris 8 with patch 116993-01 or later Solaris 9 with patch 117445-01 or later x86 Platform Solaris 7 with patch 118738-01 or later Solaris 8 with patch 116994-01 or later Solaris 9 with patch 117446-01 or later This Sun Alert notification is being provided to you on an "AS IS" basis. This Sun Alert notification may contain information provided by third parties. The issues described in this Sun Alert notification may or may not impact your system(s). Sun makes no representations, warranties, or guarantees as to the information contained herein. ANY AND ALL WARRANTIES, EXPRESS OR IMPLIED, INCLUDING WITHOUT LIMITATION WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, OR NON-INFRINGEMENT, ARE HEREBY DISCLAIMED. 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