Salvatore Bonaccorso 发现 CUPS Web 界面未正确验证权限，以及未正确处理符号链接。攻击者可能利用此问题绕过文件权限并读取任意文件，从而可能导致权限升级。

请注意，Tenable Network Security 已直接从 Ubuntu 安全公告中提取上述描述块。Tenable 已尝试在不引入其他问题的情况下，尽可能进行了自动清理和排版。

远程 OracleVM 系统缺少必要修补程序来解决关键安全更新：

- 恢复对白名单 /rss/ 资源的变更，因为这并未在上游使用。

- 来自上游的更多 STR #4461 补丁：使 rss 源全局可读，但 cachedir 为隐私。

- 修复服务器重新启动期间 Web 界面中的图标显示 (STR #4475)。

- 修复 STR #4461 的上游修补程序：允许我们所创建文件的 /rss/ 请求。

- 使用 STR #4461 的上游修补程序。

- 已应用上游修补程序，修复了 CVE-2014-5029（缺陷 #1122600）、CVE-2014-5030（缺陷 #1128764）、CVE-2014-5031（缺陷 #1128767）。

- 修复经认证的用户的 conf/log 文件读取 (STR #4461)。

- 修复 CGI 处理（STR #4454、缺陷 #1120419）。

- 针对 CVE-2014-3537 的修复补丁（缺陷 #1117794）

- CVE-2014-2856：跨站脚本缺陷（缺陷 #1117798）

- CVE-2014-3537：检查不充分导致权限升级（缺陷 #1117794）

- 已删除程序包描述变更。

- 已应用修补程序，修复了由于添加 httpSetTimeout 而导致的“Bad request”错误（STR #4440，也是 svn 修订 9967 的一部分）。

- 修复了没有准备好的数据时 cupsd 读取的超时问题（缺陷 #1110045）。

- 修复了 synconclose 修补程序以避免“too many arguments for format”警告。

- 修复了 settimeout 修补程序以包括用于 fmod 声明的 math.h。

- 修复了拼写错误，防止 Web 界面更改驱动程序（缺陷 #1104483、STR #3601）。

- 修复了 SyncOnClose 修补程序（缺陷 #984883）。

- 使用上游修补程序以避免重播 GSS 凭据（缺陷 #1040293）。

- 防止跨暂停/恢复的 BrowsePoll 问题（缺陷 #769292）：

- 避免无限期等待响应（svn 修订 9688）。

- 从 CUPS 1.5 向后移植了 httpSetTimeout API 函数，并在 ipp 后端中使用此函数，造成无限期等待直到打印机响应，发生硬错误或作业已取消。

- cups-polld：出错时重新连接。

- 添加了新的 SyncOnClose 指令，在更改配置文件后使用 fsync：默认为“Yes”。在 cupsd.conf 中调整（缺陷 #984883）。

- 修复 cupsctl 手册页拼写错误（缺陷 #1011076）。

- 使用更具可移植性的 rpm spec 文件语法进行条件性 php 构建（缺陷 #988598）。

- 修复 cupsd.conf 中的 SetEnv 指令（缺陷 #986495）。

- 修复“collection”属性发送（缺陷 #978387）。

- 阻止 format_log 段错误（缺陷 #971079）。

- 阻止 stringpool 损坏（缺陷 #884851）。

- 在排队等待打印机的作业超时的情况下不崩溃（缺陷 #855431）。

- 用于中断多部分处理的上游修补程序（缺陷 #852846）。

- 以正确的权限安装 /etc/cron.daily/cups（缺陷 #1012482）。

- 修复具有多个文件和多种格式的作业（缺陷 #972242）。

- 已应用修补程序，修复了 CVE-2012-5519（SystemGroup 中用户的权限升级或具有同等 polkit 权限）。这阻止路径在 /admin/conf/ 下的 HTTP PUT 请求（对 cupsd.conf 的请求除外），还阻止这类请求更改某些配置指令，例如 PageLog 和 FileDevice（缺陷 #875898）。

已发现 CUPS（常用 UNIX 打印系统）中的 Web 界面未正确验证 rss 文件和目录索引文件的权限。本地攻击者可能利用此问题绕过文件权限并读取任意文件，从而可能导致权限升级。

更新后的 cups 程序包修复了安全漏洞：

在 1.7.4 之前的 CUPS 中，拥有 group=lp 权限的本地用户可在 rss 目录中写入符号链接，由此通过 cupsd 获取“@SYSTEM”组权限 (CVE-2014-3537)。

发现 CUPS 中的 Web 界面未正确验证 rss 文件和目录索引文件的权限。本地攻击者可能利用此问题绕过文件权限并读取任意文件，从而可能导致权限升级（CVE-2014-5029、CVE-2014-5030、CVE-2014-5031）。

更新后的 cups 程序包修复了多个安全问题和若干缺陷，现在可用于 Red Hat Enterprise Linux 6。

Red Hat 产品安全团队将此更新评级为具有中等安全影响。可从“参考”部分中的 CVE 链接获取针对每个漏洞的通用漏洞评分系统 (CVSS) 基本分数，其给出了详细的严重性等级。

CUPS 提供了用于 Linux、UNIX 和类似操作系统的便携式打印层。

在 CUPS Web 界面中发现跨站脚本 (XSS) 缺陷。
攻击者可利用此缺陷针对 CUPS Web 界面的用户执行跨站脚本攻击。(CVE-2014-2856)

已发现 CUPS 允许特定用户在 /var/cache/cups/ 之下的特定目录中创建符号链接。具有“lp”群组权限的本地用户可以利用此缺陷读取系统上任意文件的内容，或可升级其在系统中的权限。（CVE-2014-3537、CVE-2014-5029、CVE-2014-5030、CVE-2014-5031）

CVE-2014-3537 问题由 Red Hat 产品安全的 Francisco Alonso 发现。

这些更新后的 cups 程序包也包括多个缺陷补丁。空间有限，无法在此公告中记载所有这些更改。有关这些更改的最重要的信息，用户可参阅在“参考”部分链接的 Red Hat Enterprise Linux 6.6 技术札记。

建议所有 cups 用户升级这些更新后的程序包，其中包含用于修正这些问题的向后移植的修补程序。安装此更新后，cupsd 后台程序将自动重新启动。

已发现 CUPS（常用 UNIX 打印系统）中的 Web 界面未正确验证 rss 文件和目录索引文件的权限。本地攻击者可能利用此问题绕过文件权限并读取任意文件，从而可能导致权限升级。

注意：Tenable Network Security 已直接从 DLA 安全公告中提取上述描述块。Tenable 已尝试在不引入其他问题的情况下尽可能进行了自动整理和排版。

According to its banner, the version of CUPS installed on the remote host is 1.7.x prior to 1.7.5. It is, therefore, potentially affected by an information disclosure vulnerability that was incompletely corrected by the fix for CVE-2014-3537.

A flaw exists in the 'get_file' function within the file 'scheduler/client.c' regarding the handling of symlinks. This could allow a local attacker to cause normally protected files to be accessible via the web interface.

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

The remote Ubuntu 14.04 LTS host has packages installed that are affected by multiple vulnerabilities as referenced in the USN-2341-1 advisory.

    Salvatore Bonaccorso discovered that the CUPS web interface incorrectly validated permissions and     incorrectly handled symlinks. An attacker could possibly use this issue to bypass file permissions and     read arbitrary files, possibly leading to a privilege escalation.

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

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

The remote Oracle Linux 6 host has packages installed that are affected by multiple vulnerabilities as referenced in the ELSA-2014-1388 advisory.

    - Applied upstream patch to fix CVE-2014-5029 (bug #1122600),       CVE-2014-5030 (bug #1128764), CVE-2014-5031 (bug #1128767).
    - fix patch for CVE-2014-3537 (bug #1117794)
    - CVE-2014-2856: cross-site scripting flaw (bug #1117798)
    - CVE-2014-3537: insufficient checking leads to privilege escalation (bug #1117794)

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 cross-site scripting (XSS) flaw was found in the CUPS web interface.
An attacker could use this flaw to perform a cross-site scripting attack against users of the CUPS web interface. (CVE-2014-2856)

It was discovered that CUPS allowed certain users to create symbolic links in certain directories under /var/cache/cups/. A local user with the 'lp' group privileges could use this flaw to read the contents of arbitrary files on the system or, potentially, escalate their privileges on the system. (CVE-2014-3537 , CVE-2014-5029 , CVE-2014-5030 , CVE-2014-5031)

The remote OracleVM system is missing necessary patches to address critical security updates :

  - Revert change to whitelist /rss/ resources, as this was     not used upstream.

  - More STR #4461 fixes from upstream: make rss feeds     world-readable, but cachedir private.

  - Fix icon display in web interface during server restart     (STR #4475).

  - Fixes for upstream patch for STR #4461: allow /rss/     requests for files we created.

  - Use upstream patch for STR #4461.

  - Applied upstream patch to fix CVE-2014-5029 (bug     #1122600), CVE-2014-5030 (bug #1128764), CVE-2014-5031     (bug #1128767).

  - Fix conf/log file reading for authenticated users (STR     #4461).

  - Fix CGI handling (STR #4454, bug #1120419).

  - fix patch for CVE-2014-3537 (bug #1117794)

  - CVE-2014-2856: cross-site scripting flaw (bug #1117798)

  - CVE-2014-3537: insufficient checking leads to privilege     escalation (bug #1117794)

  - Removed package description changes.

  - Applied patch to fix 'Bad request' errors as a result of     adding in httpSetTimeout (STR #4440, also part of svn     revision 9967).

  - Fixed timeout issue with cupsd reading when there is no     data ready (bug #1110045).

  - Fixed synconclose patch to avoid 'too many arguments for     format' warning.

  - Fixed settimeout patch to include math.h for fmod     declaration.

  - Fixed typo preventing web interface from changing driver     (bug #1104483, STR #3601).

  - Fixed SyncOnClose patch (bug #984883).

  - Use upstream patch to avoid replaying GSS credentials     (bug #1040293).

  - Prevent BrowsePoll problems across suspend/resume (bug     #769292) :

  - Eliminate indefinite wait for response (svn revision     9688).

  - Backported httpSetTimeout API function from CUPS 1.5 and     use it in the ipp backend so that we wait indefinitely     until the printer responds, we get a hard error, or the     job is cancelled.

  - cups-polld: reconnect on error.

  - Added new SyncOnClose directive to use fsync after     altering configuration files: defaults to 'Yes'. Adjust     in cupsd.conf (bug #984883).

  - Fix cupsctl man page typo (bug #1011076).

  - Use more portable rpm specfile syntax for conditional     php building (bug #988598).

  - Fix SetEnv directive in cupsd.conf (bug #986495).

  - Fix 'collection' attribute sending (bug #978387).

  - Prevent format_log segfault (bug #971079).

  - Prevent stringpool corruption (bug #884851).

  - Don't crash when job queued for printer that times out     (bug #855431).

  - Upstream patch for broken multipart handling (bug     #852846).

  - Install /etc/cron.daily/cups with correct permissions     (bug #1012482).

  - Fixes for jobs with multiple files and multiple formats     (bug #972242).

  - Applied patch to fix CVE-2012-5519 (privilege escalation     for users in SystemGroup or with equivalent polkit     permission). This prevents HTTP PUT requests with paths     under /admin/conf/ other than that for cupsd.conf, and     also prevents such requests altering certain     configuration directives such as PageLog and FileDevice     (bug #875898).

According to the versions of the cups package installed, the EulerOS Virtualization installation on the remote host is affected by the following vulnerabilities :

  - A cross-site scripting flaw was found in the cups web     templating engine. An attacker could use this flaw to     bypass the default configuration settings that bind the     CUPS scheduler to the 'localhost' or loopback     interface.(CVE-2015-1159)

  - It was discovered that CUPS allowed certain users to     create symbolic links in certain directories under     /var/cache/cups/. A local user with the 'lp' group     privileges could use this flaw to read the contents of     arbitrary files on the system or, potentially, escalate     their privileges on the system.(CVE-2014-5031)

  - A string reference count bug was found in cupsd,     causing premature freeing of string objects. An     attacker could submit a malicious print job that     exploits this flaw to dismantle ACLs protecting     privileged operations, allowing a replacement     configuration file to be uploaded, which in turn     allowed the attacker to run arbitrary code on the CUPS     server.(CVE-2015-1158)

  - A cross-site scripting (XSS) flaw was found in the CUPS     web interface. An attacker could use this flaw to     perform a cross-site scripting attack against users of     the CUPS web interface.(CVE-2014-2856)

  - A localhost.localdomain whitelist entry in valid_host()     in scheduler/client.c in CUPS before 2.2.2 allows     remote attackers to execute arbitrary IPP commands by     sending POST requests to the CUPS daemon in conjunction     with DNS rebinding. The localhost.localdomain name is     often resolved via a DNS server (neither the OS nor the     web browser is responsible for ensuring that     localhost.localdomain is 127.0.0.1).(CVE-2017-18190)

  - It was discovered that CUPS allowed certain users to     create symbolic links in certain directories under     /var/cache/cups/. A local user with the 'lp' group     privileges could use this flaw to read the contents of     arbitrary files on the system or, potentially, escalate     their privileges on the system.(CVE-2014-5030)

  - It was discovered that CUPS allowed certain users to     create symbolic links in certain directories under     /var/cache/cups/. A local user with the 'lp' group     privileges could use this flaw to read the contents of     arbitrary files on the system or, potentially, escalate     their privileges on the system.(CVE-2014-3537)

  - An integer overflow flaw, leading to a heap-based     buffer overflow, was found in the way CUPS handled     compressed raster image files. An attacker could create     a specially crafted image file that, when passed via     the CUPS Raster filter, could cause the CUPS filter to     crash.(CVE-2014-9679)

Note that Tenable Network Security has extracted the preceding description block directly from the EulerOS security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

ID	名前	製品	ファミリー	公開日	更新日	深刻度
77569	Ubuntu 14.04 LTS：CUPS 漏洞 (USN-2341-1)	Nessus	Ubuntu Local Security Checks	2014/9/9	2024/8/28	medium
79550	OracleVM 3.3：cups (OVMSA-2014-0035)	Nessus	OracleVM Local Security Checks	2014/11/26	2021/1/4	high
76857	Debian DSA-2990-1：cups - 安全更新	Nessus	Debian Local Security Checks	2014/7/28	2021/1/11	medium
77039	Mandriva Linux 安全公告：cups (MDVSA-2014:151)	Nessus	Mandriva Local Security Checks	2014/8/7	2021/1/6	medium
79177	CentOS 6：cups (CESA-2014:1388)	Nessus	CentOS Local Security Checks	2014/11/12	2021/1/4	medium
82170	Debian DLA-22-1：cups 安全更新	Nessus	Debian Local Security Checks	2015/3/26	2021/1/11	medium
77149	CUPS 1.7.x < 1.7.5 'get_file' Function Symlink Handling Info Disclosure	Nessus	Misc.	2014/8/12	2019/11/25	medium
77569	Ubuntu 14.04 LTS : CUPS vulnerabilities (USN-2341-1)	Nessus	Ubuntu Local Security Checks	2014/9/9	2024/8/28	medium
78522	Oracle Linux 6 : cups (ELSA-2014-1388)	Nessus	Oracle Linux Local Security Checks	2014/10/17	2024/10/22	medium
78781	Amazon Linux AMI : cups (ALAS-2014-438)	Nessus	Amazon Linux Local Security Checks	2014/11/3	2018/4/18	medium
79550	OracleVM 3.3 : cups (OVMSA-2014-0035)	Nessus	OracleVM Local Security Checks	2014/11/26	2021/1/4	high
124935	EulerOS Virtualization 3.0.1.0 : cups (EulerOS-SA-2019-1432)	Nessus	Huawei Local Security Checks	2019/5/14	2024/5/23	high

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