Various issues have been fixed in lighttpd. CVE-2008-4298, CVE-2008-4359 and CVE-2008-4360 have been assigned to thess issues.

バナーによると、リモートホストで実行されているlighttpdのバージョンは、1.4.20より前です。したがって、以下の複数の脆弱性による影響を受けます。

  - connection_state_machine（）関数にサービス拒否の脆弱性があり、ダウンロードが完了する前に切断するとトリガーされます。認証されていないリモート攻撃者がこれを悪用して、アクティブなSSL接続をすべて失わせる可能性があります。
    （CVE-2008-1531）

  - http_request_parse（）関数にメモリリークの欠陥が存在します。認証されていないリモート攻撃者がこれを悪用し、複数のリクエストヘッダーを持つ多数のリクエストを介してサービス拒否状態を引き起こす可能性があります。（CVE-2008-4298）

  - URLデコードを実行する前に、url.redirectおよびurl.rewrite構成設定のパターンとURIを比較することにより、セキュリティバイパスの脆弱性が存在します。
    認証されていないリモート攻撃者がこれを悪用し、意図したアクセス制限をバイパスして、秘密データを漏洩または改変する可能性があります。
    （CVE-2008-4359）

  - 大文字と小文字を区別しないオペレーティングシステムおよびファイルシステムでも大文字と小文字を区別する比較を実行するため、セキュリティバイパスの脆弱性がmod_userdirに存在します。認証されていないリモート攻撃者がこれを悪用し、意図したアクセス制限をバイパスして、秘密情報を漏洩する可能性があります。（CVE-2008-4360）

Nessusはこれらの問題をテストしておらず、代わりにアプリケーションの自己報告されたバージョン番号にのみ依存しています。

This update fixes some moderate security issues and includes a few enhancements.

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

According to its banner, the version of lighttpd running on the remote host is prior to 1.4.20. It is, therefore, affected by multiple vulnerabilities :

  - A denial of service vulnerability exists in the     connection_state_machine() function that is triggered     when disconnecting before a download has finished. An     unauthenticated, remote attacker can exploit this to     cause all active SSL connections to be lost.
    (CVE-2008-1531)

  - A memory leak flaw exists in the http_request_parse()     function. An unauthenticated, remote attacker can     exploit this, via a large number of requests with     duplicate request headers, to cause a denial of service     condition. (CVE-2008-4298)

  - A security bypass vulnerability exists due to comparing     URIs to patterns in url.redirect and url.rewrite     configuration settings before performing URL decoding.
    An unauthenticated, remote attacker can exploit this to     bypass intended access restrictions, resulting in the     disclosure or modification of sensitive data.
    (CVE-2008-4359)

  - A security bypass vulnerability exists in mod_userdir     due to performing case-sensitive comparisons even on     case-insensitive operating systems and file systems. An     unauthenticated, remote attacker can exploit this to     bypass intended access restrictions, resulting in the     disclosure of sensitive information. (CVE-2008-4360)

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

Several local/remote vulnerabilities have been discovered in lighttpd, a fast webserver with minimal memory footprint. 

The Common Vulnerabilities and Exposures project identifies the following problems :

  - CVE-2008-4298     A memory leak in the http_request_parse function could     be used by remote attackers to cause lighttpd to consume     memory, and cause a denial of service attack.

  - CVE-2008-4359     Inconsistant handling of URL patterns could lead to the     disclosure of resources a server administrator did not     anticipate when using rewritten URLs.

  - CVE-2008-4360     Upon filesystems which don't handle case-insensitive     paths differently it might be possible that     unanticipated resources could be made available by     mod_userdir.

根据其标题，远程主机上运行的 lighttpd 版本低于 1.4.20。因此，该服务器受到多个漏洞的影响：

  - connection_state_machine() 函数中存在一个拒绝服务漏洞，该漏洞会在下载完成前断开连接时触发。未经身份验证的远程攻击者可利用此漏洞，导致所有活动的 SSL 连接丢失。
    (CVE-2008-1531)

  - http_request_parse() 函数中存在一个内存泄漏缺陷。未经身份验证的远程攻击者可利用此缺陷，通过大量包含重复请求的请求造成拒绝服务情况。(CVE-2008-4298)

  - 存在一个安全绕过漏洞，这是执行 URL 解码之前将 URI 与 url.redirect 和 url.rewrite 配置设置中的模式进行比较所致。
    未经身份验证的远程攻击者可利用此漏洞，绕过预期的访问限制，导致敏感信息泄露或修改。
    (CVE-2008-4359)

  - mod_userdir 中存在一个安全绕过漏洞，这是即使在不区分大小写的操作系统和文件系统上执行区分大小写的比较所致。未经身份验证的远程攻击者可利用此漏洞，绕过预期的访问限制，导致敏感信息泄露。(CVE-2008-4360)

请注意，Nessus 尚未测试这些问题，而是只依据应用程序自我报告的版本号进行判断。

Lighttpd seurity announcement :

lighttpd 1.4.19, and possibly other versions before 1.5.0, does not decode the url before matching against rewrite and redirect patterns, which allows attackers to bypass rewrites rules. this can be a security problem in certain configurations if these rules are used to hide certain urls.

lighttpd 1.4.19, and possibly other versions before 1.5.0, does not lowercase the filename after generating it from the url in mod_userdir on case insensitive (file)systems.

As other modules are case sensitive, this may lead to information disclosure; for example if one configured php to handle files ending on '.php', an attacker will get the php source with http://example.com/~user/file.PHP

lighttpd 1.4.19 does not always release a header if it triggered a 400 (Bad Request) due to a duplicate header.

The remote host is affected by the vulnerability described in GLSA-200812-04 (lighttpd: Multiple vulnerabilities)

    Multiple vulnerabilities have been reported in lighttpd:
    Qhy reported a memory leak in the http_request_parse() function in     request.c (CVE-2008-4298).
    Gaetan Bisson reported that URIs are not decoded before applying     url.redirect and url.rewrite rules (CVE-2008-4359).
    Anders1 reported that mod_userdir performs case-sensitive comparisons     on filename components in configuration options, which is insufficient     when case-insensitive filesystems are used (CVE-2008-4360).
  Impact :

    A remote attacker could exploit these vulnerabilities to cause a Denial     of Service, to bypass intended access restrictions, to obtain sensitive     information, or to possibly modify data.
  Workaround :

    There is no known workaround at this time.

根據其標題，遠端主機上執行的 lighttpd 版本比 1.4.20 舊。因此，該應用程式受到多個弱點影響：

  - connection_state_machine() 函式中有一個拒絕服務弱點，在下載完成前中斷連線時可觸發此弱點。未經驗證的遠端攻擊者可利用此弱點，造成所有使用中的 SSL 連線遺失。
    (CVE-2008-1531)

  - http_request_parse() 函式中有一個記憶體洩漏瑕疵。未經驗證的遠端攻擊者可藉由大量包含重複要求標頭的要求，利用此瑕疵造成拒絕服務情形。(CVE-2008-4298)

  - 存在一個安全性繞過弱點，這是在執行 URL 解碼之前，將 URI 與 url.redirect 和 url.rewrite 組態設定中的模式進行比較所導致。
    未經驗證的遠端攻擊者可利用此弱點繞過預定的存取限制，進而導致敏感資訊遭洩漏或篡改。
    (CVE-2008-4359)

  - mod_userdir 中存在一個安全性繞過弱點，這是程式即使在不區分大小寫的作業系統和檔案系統上也會執行區分大小寫的比較所導致。未經驗證的遠端攻擊者可利用此弱點繞過預定的存取限制，進而導致敏感資訊洩漏。(CVE-2008-4360)

請注意，Nessus 並未測試這些問題，而是僅依據應用程式自我報告的版本號碼。

According to its banner, the version of lighttpd installed on the remote host is older than 1.4.20.  Such versions may be affected by several issues, including :

  - SSL connections could be shut down by a remote attacker.
  - URL rewrite and redirect patterns can be circumvented by encoding.
  - mod_userdir does not sanitize URLs, which could lead to an information disclosure on case insensitive file systems e.g. http://example.com/~user/file.PHP would get the source code of file.php, instead of running the script.
  - The server leaks memory when it processes duplicate headers. This could lead to a denial of service by resource exhaustion.

ID	名稱	產品	系列	已發布	已更新	嚴重性
40061	openSUSE Security Update : lighttpd (lighttpd-309)	Nessus	SuSE Local Security Checks	2009/7/21	2021/1/14	high
34332	lighttpd < 1.4.20の複数の脆弱性	Nessus	Web Servers	2008/10/3	2018/7/13	high
34812	openSUSE 10 Security Update : lighttpd (lighttpd-5785)	Nessus	SuSE Local Security Checks	2008/11/18	2021/1/14	high
35665	Fedora 9 : lighttpd-1.4.20-6.fc9 (2008-11923)	Nessus	Fedora Local Security Checks	2009/2/13	2021/1/11	high
34332	lighttpd < 1.4.20 Multiple Vulnerabilities	Nessus	Web Servers	2008/10/3	2018/7/13	high
34353	Debian DSA-1645-1 : lighttpd - various	Nessus	Debian Local Security Checks	2008/10/7	2021/1/4	high
34332	lighttpd < 1.4.20 多个漏洞	Nessus	Web Servers	2008/10/3	2018/7/13	high
34310	FreeBSD : lighttpd -- multiple vulnerabilities (fb911e31-8ceb-11dd-bb29-000c6e274733)	Nessus	FreeBSD Local Security Checks	2008/9/29	2021/1/6	high
35021	GLSA-200812-04 : lighttpd: Multiple vulnerabilities	Nessus	Gentoo Local Security Checks	2008/12/3	2021/1/6	high
34332	lighttpd < 1.4.20 多個弱點	Nessus	Web Servers	2008/10/3	2018/7/13	high
4698	lighttpd < 1.4.20 Multiple Vulnerabilities	Nessus Network Monitor	Web Servers	2008/10/3	2019/3/6	medium

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