Vulnerabilities > CVE-2005-1924 - Remote Command Execution vulnerability in SquirrelMail G/PGP Encryption Plug-in

047910
CVSS 9.3 - CRITICAL
Attack vector
NETWORK
Attack complexity
MEDIUM
Privileges required
NONE
Confidentiality impact
COMPLETE
Integrity impact
COMPLETE
Availability impact
COMPLETE
network
squirrelmail
critical
nessus
exploit available

Summary

The G/PGP (GPG) Plugin 2.1 and earlier for Squirrelmail allow remote authenticated users to execute arbitrary commands via shell metacharacters in (1) the fpr parameter to the deleteKey function in gpg_keyring.php, as called by (a) import_key_file.php, (b) import_key_text.php, and (c) keyring_main.php; and (2) the keyserver parameter to the gpg_recv_key function in gpg_key_functions.php, as called by gpg_options.php. NOTE: this issue may overlap CVE-2007-3636.

Vulnerable Configurations

Part Description Count
Application
Squirrelmail
1

Exploit-Db

  • descriptionSquirrelMail G/PGP Plugin deletekey() Command Injection Exploit. CVE-2005-1924. Webapps exploit for php platform
    idEDB-ID:4718
    last seen2016-01-31
    modified2007-12-11
    published2007-12-11
    reporterBackdoored
    sourcehttps://www.exploit-db.com/download/4718/
    titleSquirrelMail G/PGP Plugin deletekey Command Injection Exploit
  • descriptionSquirrelMail G/PGP Encryption Plug-in 2.0 Command Execution Vuln. CVE-2005-1924. Webapps exploit for php platform
    fileexploits/php/webapps/4173.txt
    idEDB-ID:4173
    last seen2016-01-31
    modified2007-07-11
    platformphp
    port
    published2007-07-11
    reporterjmp-esp
    sourcehttps://www.exploit-db.com/download/4173/
    titleSquirrelMail G/PGP Encryption Plugin 2.0 - Command Execution Vuln
    typewebapps

Nessus

NASL familyGentoo Local Security Checks
NASL idGENTOO_GLSA-200708-08.NASL
descriptionThe remote host is affected by the vulnerability described in GLSA-200708-08 (SquirrelMail G/PGP plugin: Arbitrary code execution) The functions deletekey(), gpg_check_sign_pgp_mime() and gpg_recv_key() used in the SquirrelMail G/PGP encryption plugin do not properly escape user-supplied data. Impact : An authenticated user could use the plugin to execute arbitrary code on the server, or a remote attacker could send a specially crafted e-mail to a SquirrelMail user, possibly leading to the execution of arbitrary code with the privileges of the user running the underlying web server. Note that the G/PGP plugin is disabled by default. Workaround : Enter the SquirrelMail configuration directory (/usr/share/webapps/squirrelmail/version/htdocs/config), then execute the conf.pl script. Select the plugins menu, then select the gpg plugin item number in the
last seen2020-06-01
modified2020-06-02
plugin id25873
published2007-08-13
reporterThis script is Copyright (C) 2007-2019 Tenable Network Security, Inc.
sourcehttps://www.tenable.com/plugins/nessus/25873
titleGLSA-200708-08 : SquirrelMail G/PGP plugin: Arbitrary code execution
code
#%NASL_MIN_LEVEL 80502
#
# (C) Tenable Network Security, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from Gentoo Linux Security Advisory GLSA 200708-08.
#
# The advisory text is Copyright (C) 2001-2015 Gentoo Foundation, Inc.
# and licensed under the Creative Commons - Attribution / Share Alike 
# license. See http://creativecommons.org/licenses/by-sa/3.0/
#

include("compat.inc");

if (description)
{
  script_id(25873);
  script_version("1.13");
  script_cvs_date("Date: 2019/08/02 13:32:44");

  script_cve_id("CVE-2005-1924", "CVE-2006-4169");
  script_xref(name:"GLSA", value:"200708-08");

  script_name(english:"GLSA-200708-08 : SquirrelMail G/PGP plugin: Arbitrary code execution");
  script_summary(english:"Checks for updated package(s) in /var/db/pkg");

  script_set_attribute(
    attribute:"synopsis", 
    value:
"The remote Gentoo host is missing one or more security-related
patches."
  );
  script_set_attribute(
    attribute:"description", 
    value:
"The remote host is affected by the vulnerability described in GLSA-200708-08
(SquirrelMail G/PGP plugin: Arbitrary code execution)

    The functions deletekey(), gpg_check_sign_pgp_mime() and gpg_recv_key()
    used in the SquirrelMail G/PGP encryption plugin do not properly escape
    user-supplied data.
  
Impact :

    An authenticated user could use the plugin to execute arbitrary code on
    the server, or a remote attacker could send a specially crafted e-mail
    to a SquirrelMail user, possibly leading to the execution of arbitrary
    code with the privileges of the user running the underlying web server.
    Note that the G/PGP plugin is disabled by default.
  
Workaround :

    Enter the SquirrelMail configuration directory
    (/usr/share/webapps/squirrelmail/version/htdocs/config), then execute
    the conf.pl script. Select the plugins menu, then select the gpg plugin
    item number in the 'Installed Plugins' list to disable it. Press S to
    save your changes, then Q to quit."
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://security.gentoo.org/glsa/200708-08"
  );
  script_set_attribute(
    attribute:"solution", 
    value:
"All SquirrelMail users should upgrade to the latest version:
    # emerge --sync
    # emerge --ask --oneshot --verbose '>=mail-client/squirrelmail-1.4.10a-r2'"
  );
  script_set_cvss_base_vector("CVSS2#AV:N/AC:M/Au:N/C:C/I:C/A:C");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:gentoo:linux:squirrelmail");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:gentoo:linux");

  script_set_attribute(attribute:"patch_publication_date", value:"2007/08/11");
  script_set_attribute(attribute:"plugin_publication_date", value:"2007/08/13");
  script_set_attribute(attribute:"vuln_publication_date", value:"2007/07/11");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_copyright(english:"This script is Copyright (C) 2007-2019 Tenable Network Security, Inc.");
  script_family(english:"Gentoo Local Security Checks");

  script_dependencies("ssh_get_info.nasl");
  script_require_keys("Host/local_checks_enabled", "Host/Gentoo/release", "Host/Gentoo/qpkg-list");

  exit(0);
}


include("audit.inc");
include("global_settings.inc");
include("qpkg.inc");

if (!get_kb_item("Host/local_checks_enabled")) audit(AUDIT_LOCAL_CHECKS_NOT_ENABLED);
if (!get_kb_item("Host/Gentoo/release")) audit(AUDIT_OS_NOT, "Gentoo");
if (!get_kb_item("Host/Gentoo/qpkg-list")) audit(AUDIT_PACKAGE_LIST_MISSING);


flag = 0;

if (qpkg_check(package:"mail-client/squirrelmail", unaffected:make_list("ge 1.4.10a-r2"), vulnerable:make_list("lt 1.4.10a-r2"))) flag++;

if (flag)
{
  if (report_verbosity > 0) security_hole(port:0, extra:qpkg_report_get());
  else security_hole(0);
  exit(0);
}
else
{
  tested = qpkg_tests_get();
  if (tested) audit(AUDIT_PACKAGE_NOT_AFFECTED, tested);
  else audit(AUDIT_PACKAGE_NOT_INSTALLED, "SquirrelMail G/PGP plugin");
}

Seebug

bulletinFamilyexploit
descriptionBUGTRAQ ID: 24874,24782 CVE(CAN) ID: CVE-2005-1924,CVE-2006-4169 SquirrelMail是一个多功能的用PHP4实现的Webmail程序,可运行于Linux/Unix类操作系统下。 SquirrelMail的实现上存在多个输入验证漏洞,远程攻击者可能利用这些漏洞在服务器上执行任意命令。 SquirrelMail中的G/PGP加密插件没有正确地过滤所包含的某些文件,gpg_help.php和gpg_help_base.php文件中可能包含有通过“help” HTTP GET请求参数所提供的本地文件,代码如下: 68 // Help body text is inserted here via GET parameter 69 require_once (SM_PATH.'plugins/gpg/help/' . $_GET['help'] ); 如果使用了目录遍历标识符,攻击者就可以导致将储存在Web服务器中的文件解析为PHP代码。 由于使用未经过滤的用户数据调用了exec(),导致G/PGP加密插件中gpg_key_functions.php所定义的gpg_recv_key()函数中存在命令注入漏洞,代码如下: $command = &quot;$path_to_gpg --batch --no-tty --homedir $gpg_key_dir \ --keyserver hkp://$keyserver --recv-key $searchkeyid 2&gt;&amp;1&quot;; [...] exec($command, $output, $returnval); 上面的$keyserver变量是通过对gpg_options.php脚本的POST数据提供的。攻击者必须拥有有效的认证会话才能利用这个漏洞。 由于使用未经过滤的用户数据调用了exec(),导致G/PGP加密插件中gpg_hook_functions.php所定义的gpg_check_sign_pgp_mime()函数中存在命令注入漏洞,代码如下: $command = &quot;echo -n \&quot;$messageSignedText\&quot; | $path_to_gpg --batch \ --no-tty --homedir $gpg_key_dir --verify &quot;.\ $detachedSignatureFilename.&quot;- 2&gt;&amp;1&quot;; if ($debug) echo &quot;gpg command: &quot;.$command.&quot;\&quot;; exec($command, $results, $returnval); $messageSignedText变量中包含有从邮件消息中剥离的数据。 由于使用未经过滤的用户数据调用了exec(),导致G/PGP加密插件中gpg_keyring.php所定义的deleteKey()函数中存在命令注入漏洞,代码如下: $command = &quot;$path_to_gpg --batch --no-tty --yes --homedir \ $gpg_key_dir $flag $fpr 2&gt;&amp;1&quot;; exec($command, $output, $returnval); deleteKey()例程是从import_key_file.php、import_key_text.php和keyring_main.php文件中调用的,且$fpr变量是在POST数据中提供的。攻击者必须拥有有效的认证会话才能利用这个漏洞。 SquirrelMail G/PGP加密插件 2.1 SquirrelMail G/PGP加密插件 2.0 临时解决方法: * 禁用G/PGP插件,或在调用exec()之前添加以下行: $messageSignedText= escapeshellarg($messageSignedText); $keyserver = escapeshellarg($keyserver); $fpr = escapeshellarg($fpr); 厂商补丁: SquirrelMail ------------ 目前厂商还没有提供补丁或者升级程序,我们建议使用此软件的用户随时关注厂商的主页以获取最新版本: <a href="http://www.squirrelmail.org" target="_blank">http://www.squirrelmail.org</a>
idSSV:2012
last seen2017-11-19
modified2007-07-18
published2007-07-18
reporterRoot
titleSquirrelMail G/PGP加密插件多个远程命令执行漏洞