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

  - ** DISPUTED ** Unbound before 1.9.5 allows an integer overflow in the regional allocator via     regional_alloc. NOTE: The vendor disputes that this is a vulnerability. Although the code may be     vulnerable, a running Unbound installation cannot be remotely or locally exploited. (CVE-2019-25032)

  - ** DISPUTED ** Unbound before 1.9.5 allows an integer overflow in sldns_str2wire_dname_buf_origin, leading     to an out-of-bounds write. NOTE: The vendor disputes that this is a vulnerability. Although the code may     be vulnerable, a running Unbound installation cannot be remotely or locally exploited. (CVE-2019-25034)

  - ** DISPUTED ** Unbound before 1.9.5 allows an out-of-bounds write in sldns_bget_token_par. NOTE: The     vendor disputes that this is a vulnerability. Although the code may be vulnerable, a running Unbound     installation cannot be remotely or locally exploited. (CVE-2019-25035)

  - ** DISPUTED ** Unbound before 1.9.5 allows an assertion failure and denial of service in synth_cname.
    NOTE: The vendor disputes that this is a vulnerability. Although the code may be vulnerable, a running     Unbound installation cannot be remotely or locally exploited. (CVE-2019-25036)

  - ** DISPUTED ** Unbound before 1.9.5 allows an assertion failure and denial of service in dname_pkt_copy     via an invalid packet. NOTE: The vendor disputes that this is a vulnerability. Although the code may be     vulnerable, a running Unbound installation cannot be remotely or locally exploited. (CVE-2019-25037)

  - ** DISPUTED ** Unbound before 1.9.5 allows an integer overflow in a size calculation in     dnscrypt/dnscrypt.c. NOTE: The vendor disputes that this is a vulnerability. Although the code may be     vulnerable, a running Unbound installation cannot be remotely or locally exploited. (CVE-2019-25038)

  - ** DISPUTED ** Unbound before 1.9.5 allows an integer overflow in a size calculation in respip/respip.c.
    NOTE: The vendor disputes that this is a vulnerability. Although the code may be vulnerable, a running     Unbound installation cannot be remotely or locally exploited. (CVE-2019-25039)

  - ** DISPUTED ** Unbound before 1.9.5 allows an infinite loop via a compressed name in dname_pkt_copy. NOTE:
    The vendor disputes that this is a vulnerability. Although the code may be vulnerable, a running Unbound     installation cannot be remotely or locally exploited. (CVE-2019-25040)

  - ** DISPUTED ** Unbound before 1.9.5 allows an assertion failure via a compressed name in dname_pkt_copy.
    NOTE: The vendor disputes that this is a vulnerability. Although the code may be vulnerable, a running     Unbound installation cannot be remotely or locally exploited. (CVE-2019-25041)

  - ** DISPUTED ** Unbound before 1.9.5 allows an out-of-bounds write via a compressed name in rdata_copy.
    NOTE: The vendor disputes that this is a vulnerability. Although the code may be vulnerable, a running     Unbound installation cannot be remotely or locally exploited. (CVE-2019-25042)

  - NLnet Labs Unbound, up to and including version 1.12.0, and NLnet Labs NSD, up to and including version     4.3.3, contain a local vulnerability that would allow for a local symlink attack. When writing the PID     file, Unbound and NSD create the file if it is not there, or open an existing file for writing. In case     the file was already present, they would follow symlinks if the file happened to be a symlink instead of a     regular file. An additional chown of the file would then take place after it was written, making the user     Unbound/NSD is supposed to run as the new owner of the file. If an attacker has local access to the user     Unbound/NSD runs as, she could create a symlink in place of the PID file pointing to a file that she would     like to erase. If then Unbound/NSD is killed and the PID file is not cleared, upon restarting with root     privileges, Unbound/NSD will rewrite any file pointed at by the symlink. This is a local vulnerability     that could create a Denial of Service of the system Unbound/NSD is running on. It requires an attacker     having access to the limited permission user Unbound/NSD runs as and point through the symlink to a     critical file on the system. (CVE-2020-28935)

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

The remote Rocky Linux 8 host has packages installed that are affected by multiple vulnerabilities as referenced in the RLSA-2021:1853 advisory.

  - ** DISPUTED ** Unbound before 1.9.5 allows an integer overflow in the regional allocator via     regional_alloc. NOTE: The vendor disputes that this is a vulnerability. Although the code may be     vulnerable, a running Unbound installation cannot be remotely or locally exploited. (CVE-2019-25032)

  - ** DISPUTED ** Unbound before 1.9.5 allows an integer overflow in sldns_str2wire_dname_buf_origin, leading     to an out-of-bounds write. NOTE: The vendor disputes that this is a vulnerability. Although the code may     be vulnerable, a running Unbound installation cannot be remotely or locally exploited. (CVE-2019-25034)

  - ** DISPUTED ** Unbound before 1.9.5 allows an out-of-bounds write in sldns_bget_token_par. NOTE: The     vendor disputes that this is a vulnerability. Although the code may be vulnerable, a running Unbound     installation cannot be remotely or locally exploited. (CVE-2019-25035)

  - ** DISPUTED ** Unbound before 1.9.5 allows an assertion failure and denial of service in synth_cname.
    NOTE: The vendor disputes that this is a vulnerability. Although the code may be vulnerable, a running     Unbound installation cannot be remotely or locally exploited. (CVE-2019-25036)

  - ** DISPUTED ** Unbound before 1.9.5 allows an assertion failure and denial of service in dname_pkt_copy     via an invalid packet. NOTE: The vendor disputes that this is a vulnerability. Although the code may be     vulnerable, a running Unbound installation cannot be remotely or locally exploited. (CVE-2019-25037)

  - ** DISPUTED ** Unbound before 1.9.5 allows an integer overflow in a size calculation in     dnscrypt/dnscrypt.c. NOTE: The vendor disputes that this is a vulnerability. Although the code may be     vulnerable, a running Unbound installation cannot be remotely or locally exploited. (CVE-2019-25038)

  - ** DISPUTED ** Unbound before 1.9.5 allows an integer overflow in a size calculation in respip/respip.c.
    NOTE: The vendor disputes that this is a vulnerability. Although the code may be vulnerable, a running     Unbound installation cannot be remotely or locally exploited. (CVE-2019-25039)

  - ** DISPUTED ** Unbound before 1.9.5 allows an infinite loop via a compressed name in dname_pkt_copy. NOTE:
    The vendor disputes that this is a vulnerability. Although the code may be vulnerable, a running Unbound     installation cannot be remotely or locally exploited. (CVE-2019-25040)

  - ** DISPUTED ** Unbound before 1.9.5 allows an assertion failure via a compressed name in dname_pkt_copy.
    NOTE: The vendor disputes that this is a vulnerability. Although the code may be vulnerable, a running     Unbound installation cannot be remotely or locally exploited. (CVE-2019-25041)

  - ** DISPUTED ** Unbound before 1.9.5 allows an out-of-bounds write via a compressed name in rdata_copy.
    NOTE: The vendor disputes that this is a vulnerability. Although the code may be vulnerable, a running     Unbound installation cannot be remotely or locally exploited. (CVE-2019-25042)

  - NLnet Labs Unbound, up to and including version 1.12.0, and NLnet Labs NSD, up to and including version     4.3.3, contain a local vulnerability that would allow for a local symlink attack. When writing the PID     file, Unbound and NSD create the file if it is not there, or open an existing file for writing. In case     the file was already present, they would follow symlinks if the file happened to be a symlink instead of a     regular file. An additional chown of the file would then take place after it was written, making the user     Unbound/NSD is supposed to run as the new owner of the file. If an attacker has local access to the user     Unbound/NSD runs as, she could create a symlink in place of the PID file pointing to a file that she would     like to erase. If then Unbound/NSD is killed and the PID file is not cleared, upon restarting with root     privileges, Unbound/NSD will rewrite any file pointed at by the symlink. This is a local vulnerability     that could create a Denial of Service of the system Unbound/NSD is running on. It requires an attacker     having access to the limited permission user Unbound/NSD runs as and point through the symlink to a     critical file on the system. (CVE-2020-28935)

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

遠端 Redhat Enterprise Linux 8 主機上安裝的套件受到 RHSA-2021: 1853 公告中提及的多個弱點影響。

  - unbound：在區域配置器中透過 regional_alloc 可造成整數溢位 (CVE-2019-25032)

  - unbound：sldns_str2wire_dname_buf_origin 中存在整數溢位弱點，可導致超出邊界寫入 (CVE-2019-25034)

  - unbound：sldns_bget_token_par 中存在超出邊界寫入弱點 (CVE-2019-25035)

  - unbound：synth_cname 中存在宣告失敗和拒絕服務弱點 (CVE-2019-25036)

  - unbound：攻擊者可透過無效封包在 dname_pkt_copy 中造成宣告失敗和拒絕服務 (CVE-2019-25037)

  - unbound：dnscrypt/dnscrypt.c 的大小計算中存在整數溢位問題 (CVE-2019-25038)

  - unbound：respip/respip.c 的大小計算中存在整數溢位問題 (CVE-2019-25039)

  - unbound：攻擊者透過壓縮名稱可在 dname_pkt_copy 中造成無限迴圈 (CVE-2019-25040)

  - unbound：攻擊者透過壓縮名稱可在 dname_pkt_copy 中造成宣告失敗 (CVE-2019-25041)

  - unbound：攻擊者透過壓縮名稱可在 rdata_copy 中造成超出邊界寫入 (CVE-2019-25042)

  - unbound：寫入 PID 檔案時會發生符號連結遊走問題 (CVE-2020-28935)

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作出判斷。

遠端 CentOS Linux 8 主機上安裝的套件受到 CESA-2021: 1853 公告中提及的多個弱點影響。

  - unbound：在區域配置器中透過 regional_alloc 可造成整數溢位 (CVE-2019-25032)

  - unbound：sldns_str2wire_dname_buf_origin 中存在整數溢位弱點，可導致超出邊界寫入 (CVE-2019-25034)

  - unbound：sldns_bget_token_par 中存在超出邊界寫入弱點 (CVE-2019-25035)

  - unbound：synth_cname 中存在宣告失敗和拒絕服務弱點 (CVE-2019-25036)

  - unbound：攻擊者可透過無效封包在 dname_pkt_copy 中造成宣告失敗和拒絕服務 (CVE-2019-25037)

  - unbound：dnscrypt/dnscrypt.c 的大小計算中存在整數溢位問題 (CVE-2019-25038)

  - unbound：respip/respip.c 的大小計算中存在整數溢位問題 (CVE-2019-25039)

  - unbound：攻擊者透過壓縮名稱可在 dname_pkt_copy 中造成無限迴圈 (CVE-2019-25040)

  - unbound：攻擊者透過壓縮名稱可在 dname_pkt_copy 中造成宣告失敗 (CVE-2019-25041)

  - unbound：攻擊者透過壓縮名稱可在 rdata_copy 中造成超出邊界寫入 (CVE-2019-25042)

  - unbound：寫入 PID 檔案時會發生符號連結遊走問題 (CVE-2020-28935)

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

遠端主機上安裝的 unbound 為 1.7.3-15 之前版本。因此，會受到 ALAS2-2021-1683 公告中所提及的多個弱點影響。

  - 在 Unbound 1.9.5 之前版本中，攻擊者可在區域配置器中透過 regional_alloc 造成整數溢位。注意：廠商對這是否屬於弱點存在爭議。雖然程式碼可能存在弱點，但攻擊者無法從遠端或本機攻擊執行中的 Unbound 安裝程式。(CVE-2019-25032)

  - 在 Unbound 1.9.5 之前版本中，攻擊者可在區域配置器中透過 ALIGN_UP macro 造成整數溢位。注意：
    廠商對這是否屬於弱點存在爭議。雖然程式碼可能存在弱點，但攻擊者無法從遠端或本機攻擊執行中的 Unbound 安裝程式。(CVE-2019-25033)

  - 在 Unbound 1.9.5 之前版本中，sldns_str2wire_dname_buf_origin 中存在整數溢位，可導致超出邊界寫入。注意：廠商對這是否屬於弱點存在爭議。雖然程式碼可能存在弱點，但攻擊者無法從遠端或本機攻擊執行中的 Unbound 安裝程式。(CVE-2019-25034)

  - 在 Unbound 1.9.5 之前版本中，sldns_bget_token_par 中存在超出邊界寫入弱點。注意：廠商對這是否屬於弱點存在爭議。雖然程式碼可能存在弱點，但攻擊者無法從遠端或本機攻擊執行中的 Unbound 安裝程式。(CVE-2019-25035)

  - 在 Unbound 1.9.5 之前版本中，synth_cname 中存在宣告失敗和拒絕服務弱點。注意：廠商對這是否屬於弱點存在爭議。雖然程式碼可能存在弱點，但攻擊者無法從遠端或本機攻擊執行中的 Unbound 安裝程式。(CVE-2019-25036)

  - 在 Unbound 1.9.5 之前版本中，攻擊者可透過無效封包在 dname_pkt_copy 中造成宣告失敗和拒絕服務。注意：廠商對這是否屬於弱點存在爭議。雖然程式碼可能存在弱點，但攻擊者無法從遠端或本機攻擊執行中的 Unbound 安裝程式。(CVE-2019-25037)

  - 在 Unbound 1.9.5 之前版本中，dnscrypt/dnscrypt.c 的大小計算中存在整數溢位問題。注意：廠商對這是否屬於弱點存在爭議。雖然程式碼可能存在弱點，但攻擊者無法從遠端或本機攻擊執行中的 Unbound 安裝程式。(CVE-2019-25038)

  - 在 Unbound 1.9.5之前版本中，respip/respip.c 的大小計算中存在整數溢位問題。注意：廠商對這是否屬於弱點存在爭議。雖然程式碼可能存在弱點，但攻擊者無法從遠端或本機攻擊執行中的 Unbound 安裝程式。(CVE-2019-25039)

  - 在 Unbound 1.9.5 之前版本中，攻擊者透過壓縮名稱可在 dname_pkt_copy 中造成無限迴圈。注意：廠商對這是否屬於弱點存在爭議。雖然程式碼可能存在弱點，但攻擊者無法從遠端或本機攻擊執行中的 Unbound 安裝程式。(CVE-2019-25040)

  - 在 Unbound 1.9.5之前版本中，攻擊者透過壓縮名稱可在 dname_pkt_copy 中造成宣告失敗。注意：廠商對這是否屬於弱點存在爭議。雖然程式碼可能存在弱點，但攻擊者無法從遠端或本機攻擊執行中的 Unbound 安裝程式。(CVE-2019-25041)

  - 在 Unbound 1.9.5之前版本中，攻擊者透過壓縮名稱可在 rdata_copy 中造成超出邊界寫入。注意：廠商對這是否屬於弱點存在爭議。雖然程式碼可能存在弱點，但攻擊者無法從遠端或本機攻擊執行中的 Unbound 安裝程式。(CVE-2019-25042)

  - NLnet Labs Unbound 的 1.12.0 版和之前的所有版本，以及 NLnet Labs NSD 的 4.3.3 版和之前的所有版本包含會導致本機符號連結攻擊的本機弱點。寫入 PID 檔案時，Unbound 和 NSD 會在檔案不存在時建立該檔案，或開啟現有檔案進行寫入。在檔案已存在的情況下，如果該檔案碰巧是符號連結而非一般檔案，則應用程式會遵循符號連結。檔案寫入後會額外造成檔案的擁有者發生改變，使得 Unbound/NSD 使用者應該以檔案的新擁有者身分執行。如果攻擊者對 Unbound/NSD 使用者具有本機存取權，則可以建立符號連結來取代 PID 檔案，並指向要清除的檔案。如果在這種情況下，Unbound/NSD 終止且未清除 PID 檔案，則以 root 權限重新啟動時，Unbound/NSD 會重寫符號連結所指向的任何檔案。這是本機弱點，可造成執行 Unbound/NSD 的系統拒絕服務。攻擊者需要能夠存取 Unbound/NSD 的有限權限使用者，並透過符號連結指向系統上的重要檔案。(CVE-2020-28935)

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作出判斷。

ID	Name	Product	Family	Published	Updated	Severity
160818	NewStart CGSL MAIN 6.02 : unbound Multiple Vulnerabilities (NS-SA-2022-0064)	Nessus	NewStart CGSL Local Security Checks	5/9/2022	5/9/2022	critical
184575	Rocky Linux 8 : unbound (RLSA-2021:1853)	Nessus	Rocky Linux Local Security Checks	11/6/2023	11/6/2023	critical
149675	RHEL 8：unbound (RHSA-2021: 1853)	Nessus	Red Hat Local Security Checks	5/19/2021	11/7/2024	critical
149745	CentOS 8：unbound (CESA-2021: 1853)	Nessus	CentOS Local Security Checks	5/19/2021	6/2/2021	critical
151275	Amazon Linux 2：unbound (ALAS-2021-1683)	Nessus	Amazon Linux Local Security Checks	7/1/2021	12/11/2024	critical

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