遠端主機受到 GLSA-201412-12 中所述的弱點影響 (D-Bus：多個弱點)

    在 D-Bus 中發現多個弱點。如需詳細資訊，請檢閱下方提及的 CVE 識別碼。
  影響：

    本機攻擊者可能會造成拒絕服務情況。
  因應措施：

    目前尚無已知的因應措施。

1.8.12 的更新 (#1168438)

- 修正 CVE-2014-3635 (fd.o#83622)

- 修正 CVE-2014-3636 (fd.o#82820)

- 修正 CVE-2014-3637 (fd.o#80559)

- 修正 CVE-2014-3638 (fd.o#81053)

- 修正 CVE-2014-3639 (fd.o#80919)

- 修正 CVE-2014-7824 (fd.o#85105)

請注意，Tenable Network Security 已直接從 Fedora 安全性公告擷取前置描述區塊。Tenable 已盡量在不造成其他問題的前提下，嘗試自動清理並將其格式化。

DBUS-1 服務和程式庫已更新到上游版本 1.6.24，修正了多個安全性問題和錯誤。

自 dbus 1.6.8 版以來的上游變更

+ 安全性修正

- 在　cmsg 訊息的填補中不接受額外的 fd，這可導致 4 位元組堆積緩衝區滿溢。(CVE-2014-3635、fdo#83622；Simon McVittie)

- 將每條訊息傳遞的最大 Unix 檔案描述符號數目預設從 1024 減少至 16，防止具有預設連線數量上限的 uid 在 Linux 的預設 rlimit 中耗盡系統匯流排的檔案描述符號。具受限程度較高之 fd 限制的發行者或系統管理員，可能希望進一步降低這些限制。此外，在 Linux 上，這可防止再次發生拒絕服務；如果發生這種情況，可致使 dbus-daemon 超出每個 sendmsg() 的 fd 數目上限，並中斷本會收到這些 fd 的處理程序。(CVE-2014-3636、fdo#82820；Alban Crequy)

- 在新的可設定限制 pending_fd_timeout (預設為 150 秒) 過去後，中斷仍具有擱置重新整理 fd 的連線，進而消除建立無法透過設定連線檔案描述符號之循環參照中斷的侵略性連線的可能性。
 (CVE-2014-3637、fdo#80559；Alban Crequy)

- 將每個連線的最大擱置回覆數目預設從 8192 減小至 128，進而減輕演算法複雜性拒絕服務攻擊 (CVE-2014-3638、fdo#81053；Alban Crequy)

- 將系統匯流排上的驗證逾時預設從 30 秒減少至 5 秒，透過耗盡所有未經驗證的連線插槽來避免拒絕服務；當耗盡所有未經驗證的連線插槽時，封鎖新連線嘗試，而不是中斷連線。(CVE-2014-3639、fdo#80919；Alban Crequy)

- 在 Linux >= 2.6.37-rc4 上，如果 sendmsg() 因 ETOOMANYREFS 失敗，則以無訊息方式中斷訊息。如此可防止惡意用戶端讓 dbus-daemon 中斷與系統服務連線的攻擊，該攻擊是本機拒絕服務。(fdo#80163、CVE-2014-3532；
Alban Crequy)

- 連續多個訊息包含 fd 時，正確追蹤剩餘 Unix 檔案描述符號。
 如此能防止可讓惡意用戶端造成 dbus-daemon 中斷與系統服務連線的另一個攻擊。
 (fdo#79694、fdo#80469、CVE-2014-3533；Alejandro Mart&iacute;nez Su&aacute;rez、Simon McVittie、Alban Crequy)

- Collabora Ltd. 的 Alban Crequy 發現並已修正 dbus-daemon (屬於 D-Bus 的參照實作) 中的拒絕服務瑕疵。此外，在極不常見的環境中，相同的瑕疵可導致不應能夠進行通訊的處理程序之間出現側通道。(CVE-2014-3477、fdo#78979)

- CVE-2013-2168：修正一個 va_list 誤用情形，其可作為某系統服務的拒絕服務使用。
 該弱點的報告者為 Alexandru Cornea。(Simon)

+ 其他修正

- 列出可啟用或作用中服務時，若發生記憶體不足，不會洩漏記憶體 (fdo#71526，Radoslaw Pajak)

- 修正迴歸測試中未定義的行為 (fdo#69924、DreamNik)

- 比對規則中的 path_namespace=’/’ 曾存在錯誤，沒有任何相符項目；現在則完全相符。(fdo#70799、Simon McVittie)

- 使 dbus_connection_set_route_peer_messages(x, FALSE) 如記載般運作。之前假定其第二個參數為 TRUE。(fdo#69165、Chengwei Yang)

- 修正不太可能出現之錯誤路徑上的 NULL 指標解除參照 (fdo#69327、Sviatoslav Chagaev)

- 如果 accept4() 失敗並出現 EINVAL，當其可以位於包含較新 glibc 的較舊 Linux 核心上時，嘗試 accept() 而非進入忙碌迴圈。(fdo#69026、Chengwei Yang)

- 如果 socket() 或 socketpair() 失敗，並出現 EINVAL 或 EPROTOTYPE (例如在具有新 glibc 的 Hurd 或舊版 Linux 上)，請在沒有 SOCK_CLOEXEC 的情況下嘗試。(fdo#69073；Pino Toscano、Chengwei Yang)

- 修正錯誤程式碼路徑上的檔案描述符號洩漏。
 (fdo#69182、Sviatoslav Chagaev)

- 如果無法使用 writev()，則修正編譯 (fdo#69409、Vasiliy Balyasnyy)

- 避免在訊號中斷 waitpid() 時發生無限忙碌迴圈 (fdo#68945、Simon McVittie)

- 正確地逸出包含非 ASCII 字元的位址 (fdo#53499、Chengwei Yang)

- 如果 malloc() 在 _dbus_string_init() 或類似函式中傳回 NULL，不要在稍後釋出字串時，釋出無效的指標 (fdo#65959、Chengwei Yang)

- 如果 malloc() 在 dbus_set_error() 中傳回 NULL，不要 va_end() 從未 va_start()ed 的 va_list (fdo#66300、Chengwei Yang)

- 修正平台上使用嚴格對齊的迴歸測試 (fdo#67279，Colin Walters)

- 避免呼叫函式參數 ‘interface’，因為部分 Windows 標頭擁有該名稱的命名空間污染巨集 (fdo#66493、Ivan Romanov)

- 使 ‘make -j check’ 運作 (fdo#68852、Simon McVittie)

- 如果 .service 檔案的開頭為 key=value，則 dbus-daemon 不會損毀 (fdo#60853，Chengwei Yang)

- 修正在 systemd 連線至匯流排前嘗試啟用 systemd 服務而發生的宣告失敗 (fdo#50199，Chengwei Yang)

- 避免忽略 write() 傳回值的編譯器警告 (Chengwei Yang)

- 再次允許 UTF-8 字串使用下列 Unicode 勘誤表 #9：非字元 U+nFFFE、U+nFFFF、U+FDD0..U+FDEF。(fdo#63072，Simon McVittie)

- 診斷錯誤使用含有負插槽 (亦即配置插槽前) 的 dbus_connection_get_data() 而非傳回垃圾 (fdo#63127，Dan Williams)

- 在啟用協助程式中，針對測試進行編譯時不重設系統匯流排位址，修正了迴歸測試。(fdo#52202，Simon)

- 修正以 Valgrind 3.8 構建，代價為造成部分編譯器上 Valgrind 3.6 的無害警告 (fdo#55932，Arun Raghavan)

- 不洩漏指向 /dev/null 的暫時 fd (fdo#56927，Michel HERMIER)

- 在 Cmake 下建立 session.d、system.d 目錄 (fdo#41319，Ralf Habacker)

- 包含 alloca() 的 alloca.h (若可用)，修正了 Solaris 10 上的編譯問題 (fdo#63071，Dagobert Michelsen)

Simon McVittie reports :

Do not accept an extra fd in the padding of a cmsg message, which could lead to a 4-byte heap buffer overrun (CVE-2014-3635).

Reduce default for maximum Unix file descriptors passed per message from 1024 to 16, preventing a uid with the default maximum number of connections from exhausting the system bus' file descriptors under Linux's default rlimit (CVE-2014-3636).

Disconnect connections that still have a fd pending unmarshalling after a new configurable limit, pending_fd_timeout (defaulting to 150 seconds), removing the possibility of creating an abusive connection that cannot be disconnected by setting up a circular reference to a connection's file descriptor (CVE-2014-3637).

Reduce default for maximum pending replies per connection from 8192 to 128, mitigating an algorithmic complexity denial-of-service attack (CVE-2014-3638).

Reduce default for authentication timeout on the system bus from 30 seconds to 5 seconds, avoiding denial of service by using up all unauthenticated connection slots; and when all unauthenticated connection slots are used up, make new connection attempts block instead of disconnecting them (CVE-2014-3639).

Alban Crequy and Simon McVittie discovered several vulnerabilities in the D-Bus message daemon.

  - CVE-2014-3635     On 64-bit platforms, file descriptor passing could be     abused by local users to cause heap corruption in     dbus-daemon, leading to a crash, or potentially to     arbitrary code execution.

  - CVE-2014-3636     A denial-of-service vulnerability in dbus-daemon allowed     local attackers to prevent new connections to     dbus-daemon, or disconnect existing clients, by     exhausting descriptor limits.

  - CVE-2014-3637     Malicious local users could create D-Bus connections to     dbus-daemon which could not be terminated by killing the     participating processes, resulting in a     denial-of-service vulnerability.

  - CVE-2014-3638     dbus-daemon suffered from a denial-of-service     vulnerability in the code which tracks which messages     expect a reply, allowing local attackers to reduce the     performance of dbus-daemon.

  - CVE-2014-3639     dbus-daemon did not properly reject malicious     connections from local users, resulting in a     denial-of-service vulnerability.

The remote Ubuntu 14.04 LTS host has packages installed that are affected by multiple vulnerabilities as referenced in the USN-2352-1 advisory.

    Simon McVittie discovered that DBus incorrectly handled the file descriptors message limit. A local     attacker could use this issue to cause DBus to crash, resulting in a denial of service, or possibly     execute arbitrary code. This issue only applied to Ubuntu 12.04 LTS and Ubuntu 14.04 LTS. (CVE-2014-3635)

    Alban Crequy discovered that DBus incorrectly handled a large number of file descriptor messages. A local     attacker could use this issue to cause DBus to stop responding, resulting in a denial of service. This     issue only applied to Ubuntu 12.04 LTS and Ubuntu 14.04 LTS. (CVE-2014-3636)

    Alban Crequy discovered that DBus incorrectly handled certain file descriptor messages. A local attacker     could use this issue to cause DBus to maintain persistent connections, possibly resulting in a denial of     service. This issue only applied to Ubuntu 12.04 LTS and Ubuntu 14.04 LTS. (CVE-2014-3637)

    Alban Crequy discovered that DBus incorrectly handled a large number of parallel connections and parallel     message calls. A local attacker could use this issue to cause DBus to consume resources, possibly     resulting in a denial of service. (CVE-2014-3638)

    Alban Crequy discovered that DBus incorrectly handled incomplete connections. A local attacker could use     this issue to cause DBus to fail legitimate connection attempts, resulting in a denial of service.
    (CVE-2014-3639)

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.

Update to 1.6.28

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.

The remote NewStart CGSL host, running version MAIN 6.02, has dbus packages installed that are affected by multiple vulnerabilities:

  - Unspecified vulnerability in the match_rule_equal function in bus/signals.c in D-Bus before 1.0.2 allows     local applications to remove match rules for other applications and cause a denial of service (lost     process messages). (CVE-2006-6107)

  - dbus-daemon in D-Bus before 1.0.3, and 1.1.x before 1.1.20, recognizes send_interface attributes in allow     directives in the security policy only for fully qualified method calls, which allows local users to     bypass intended access restrictions via a method call with a NULL interface. (CVE-2008-0595)

  - The _dbus_validate_signature_with_reason function (dbus-marshal-validate.c) in D-Bus (aka DBus) before     1.2.14 uses incorrect logic to validate a basic type, which allows remote attackers to spoof a signature     via a crafted key. NOTE: this is due to an incorrect fix for CVE-2008-3834. (CVE-2009-1189)

  - libdbus 1.5.x and earlier, when used in setuid or other privileged programs in X.org and possibly other     products, allows local users to gain privileges and execute arbitrary code via the DBUS_SYSTEM_BUS_ADDRESS     environment variable. NOTE: libdbus maintainers state that this is a vulnerability in the applications     that do not cleanse environment variables, not in libdbus itself: we do not support use of libdbus in     setuid binaries that do not sanitize their environment before their first call into libdbus.
    (CVE-2012-3524)

  - The _dbus_printf_string_upper_bound function in dbus/dbus-sysdeps-unix.c in D-Bus (aka DBus) 1.4.x before     1.4.26, 1.6.x before 1.6.12, and 1.7.x before 1.7.4 allows local users to cause a denial of service     (service crash) via a crafted message. (CVE-2013-2168)

  - The dbus-daemon in D-Bus 1.2.x through 1.4.x, 1.6.x before 1.6.20, and 1.8.x before 1.8.4, sends an     AccessDenied error to the service instead of a client when the client is prohibited from accessing the     service, which allows local users to cause a denial of service (initialization failure and exit) or     possibly conduct a side-channel attack via a D-Bus message to an inactive service. (CVE-2014-3477)

  - dbus 1.3.0 before 1.6.22 and 1.8.x before 1.8.6 allows local users to cause a denial of service     (disconnect) via a certain sequence of crafted messages that cause the dbus-daemon to forward a message     containing an invalid file descriptor. (CVE-2014-3533)

  - Off-by-one error in D-Bus 1.3.0 through 1.6.x before 1.6.24 and 1.8.x before 1.8.8, when running on a     64-bit system and the max_message_unix_fds limit is set to an odd number, allows local users to cause a     denial of service (dbus-daemon crash) or possibly execute arbitrary code by sending one more file     descriptor than the limit, which triggers a heap-based buffer overflow or an assertion failure.
    (CVE-2014-3635)

  - D-Bus 1.3.0 through 1.6.x before 1.6.24 and 1.8.x before 1.8.8 allows local users to (1) cause a denial of     service (prevention of new connections and connection drop) by queuing the maximum number of file     descriptors or (2) cause a denial of service (disconnect) via multiple messages that combine to have more     than the allowed number of file descriptors for a single sendmsg call. (CVE-2014-3636)

  - D-Bus 1.3.0 through 1.6.x before 1.6.24 and 1.8.x before 1.8.8 does not properly close connections for     processes that have terminated, which allows local users to cause a denial of service via a D-bus message     containing a D-Bus connection file descriptor. (CVE-2014-3637)

  - The bus_connections_check_reply function in config-parser.c in D-Bus before 1.6.24 and 1.8.x before 1.8.8     allows local users to cause a denial of service (CPU consumption) via a large number of method calls.
    (CVE-2014-3638)

  - The dbus-daemon in D-Bus before 1.6.24 and 1.8.x before 1.8.8 does not properly close old connections,     which allows local users to cause a denial of service (incomplete connection consumption and prevention of     new connections) via a large number of incomplete connections. (CVE-2014-3639)

  - D-Bus 1.3.0 through 1.6.x before 1.6.26, 1.8.x before 1.8.10, and 1.9.x before 1.9.2 allows local users to     cause a denial of service (prevention of new connections and connection drop) by queuing the maximum     number of file descriptors. NOTE: this vulnerability exists because of an incomplete fix for     CVE-2014-3636.1. (CVE-2014-7824)

  - D-Bus 1.4.x through 1.6.x before 1.6.30, 1.8.x before 1.8.16, and 1.9.x before 1.9.10 does not validate     the source of ActivationFailure signals, which allows local users to cause a denial of service (activation     failure error returned) by leveraging a race condition involving sending an ActivationFailure signal     before systemd responds. (CVE-2015-0245)

  - An issue was discovered in dbus >= 1.3.0 before 1.12.18. The DBusServer in libdbus, as used in dbus-     daemon, leaks file descriptors when a message exceeds the per-message file descriptor limit. A local     attacker with access to the D-Bus system bus or another system service's private AF_UNIX socket could use     this to make the system service reach its file descriptor limit, denying service to subsequent D-Bus     clients. (CVE-2020-12049)

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

The remote NewStart CGSL host, running version MAIN 6.06, has dbus packages installed that are affected by multiple vulnerabilities:

  - dbus before 1.10.28, 1.12.x before 1.12.16, and 1.13.x before 1.13.12, as used in DBusServer in Canonical     Upstart in Ubuntu 14.04 (and in some, less common, uses of dbus-daemon), allows cookie spoofing because of     symlink mishandling in the reference implementation of DBUS_COOKIE_SHA1 in the libdbus library. (This only     affects the DBUS_COOKIE_SHA1 authentication mechanism.) A malicious client with write access to its own     home directory could manipulate a ~/.dbus-keyrings symlink to cause a DBusServer with a different uid to     read and write in unintended locations. In the worst case, this could result in the DBusServer reusing a     cookie that is known to the malicious client, and treating that cookie as evidence that a subsequent     client connection came from an attacker-chosen uid, allowing authentication bypass. (CVE-2019-12749)

  - libdbus 1.5.x and earlier, when used in setuid or other privileged programs in X.org and possibly other     products, allows local users to gain privileges and execute arbitrary code via the DBUS_SYSTEM_BUS_ADDRESS     environment variable. NOTE: libdbus maintainers state that this is a vulnerability in the applications     that do not cleanse environment variables, not in libdbus itself: we do not support use of libdbus in     setuid binaries that do not sanitize their environment before their first call into libdbus.
    (CVE-2012-3524)

  - Unspecified vulnerability in the match_rule_equal function in bus/signals.c in D-Bus before 1.0.2 allows     local applications to remove match rules for other applications and cause a denial of service (lost     process messages). (CVE-2006-6107)

  - dbus-daemon in D-Bus before 1.0.3, and 1.1.x before 1.1.20, recognizes send_interface attributes in allow     directives in the security policy only for fully qualified method calls, which allows local users to     bypass intended access restrictions via a method call with a NULL interface. (CVE-2008-0595)

  - The _dbus_validate_signature_with_reason function (dbus-marshal-validate.c) in D-Bus (aka DBus) before     1.2.14 uses incorrect logic to validate a basic type, which allows remote attackers to spoof a signature     via a crafted key. NOTE: this is due to an incorrect fix for CVE-2008-3834. (CVE-2009-1189)

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

ID	Name	Product	Family	Published	Updated	Severity
79965	GLSA-201412-12 : D-Bus：多個弱點	Nessus	Gentoo Local Security Checks	12/15/2014	1/6/2021	medium
80060	Fedora 21 : dbus-1.8.12-1.fc21 (2014-16147)	Nessus	Fedora Local Security Checks	12/17/2014	1/11/2021	medium
77890	openSUSE 安全性更新：dbus-1 (openSUSE-SU-2014:1239-1)	Nessus	SuSE Local Security Checks	9/26/2014	1/19/2021	medium
77733	FreeBSD : dbus -- multiple vulnerabilities (38242d51-3e58-11e4-ac2f-bcaec565249c)	Nessus	FreeBSD Local Security Checks	9/18/2014	1/6/2021	medium
77716	Debian DSA-3026-1 : dbus - security update	Nessus	Debian Local Security Checks	9/17/2014	1/11/2021	medium
77809	Ubuntu 14.04 LTS : DBus vulnerabilities (USN-2352-1)	Nessus	Ubuntu Local Security Checks	9/23/2014	8/27/2024	medium
80130	Fedora 19 : dbus-1.6.28-1.fc19 (2014-16227)	Nessus	Fedora Local Security Checks	12/22/2014	1/11/2021	medium
167488	NewStart CGSL MAIN 6.02 : dbus Multiple Vulnerabilities (NS-SA-2022-0093)	Nessus	NewStart CGSL Local Security Checks	11/15/2022	11/16/2022	medium
266270	NewStart CGSL MAIN 6.06 : dbus Multiple Vulnerabilities (NS-SA-2025-0231)	Nessus	NewStart CGSL Local Security Checks	9/30/2025	9/30/2025	high

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