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

  - unbound: integer overflow in the regional allocator via regional_alloc (CVE-2019-25032)

  - unbound: integer overflow in sldns_str2wire_dname_buf_origin can lead to an out-of-bounds write     (CVE-2019-25034)

  - unbound: out-of-bounds write in sldns_bget_token_par (CVE-2019-25035)

  - unbound: assertion failure and denial of service in synth_cname (CVE-2019-25036)

  - unbound: assertion failure and denial of service in dname_pkt_copy via an invalid packet (CVE-2019-25037)

  - unbound: integer overflow in a size calculation in dnscrypt/dnscrypt.c (CVE-2019-25038)

  - unbound: integer overflow in a size calculation in respip/respip.c (CVE-2019-25039)

  - unbound: infinite loop via a compressed name in dname_pkt_copy (CVE-2019-25040)

  - unbound: assertion failure via a compressed name in dname_pkt_copy (CVE-2019-25041)

  - unbound: out-of-bounds write via a compressed name in rdata_copy (CVE-2019-25042)

  - unbound: symbolic link traversal when writing PID file (CVE-2020-28935)

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

An update of the unbound package has been released.

According to the versions of the unbound packages installed, the EulerOS installation on the remote host is affected by the following vulnerabilities :

  - Unbound before 1.9.5 allows configuration injection in     create_unbound_ad_servers.sh upon a successful     man-in-the-middle attack against a cleartext HTTP     session.(CVE-2019-25031)

  - Unbound before 1.9.5 allows an integer overflow in the     regional allocator via regional_alloc.(CVE-2019-25032)

  - Unbound before 1.9.5 allows an integer overflow in the     regional allocator via the ALIGN_UP     macro.(CVE-2019-25033)

  - Unbound before 1.9.5 allows an integer overflow in     sldns_str2wire_dname_buf_origin, leading to an     out-of-bounds write.(CVE-2019-25034)

  - Unbound before 1.9.5 allows an out-of-bounds write in     sldns_bget_token_par.(CVE-2019-25035)

  - Unbound before 1.9.5 allows an assertion failure and     denial of service in synth_cname.(CVE-2019-25036)

  - Unbound before 1.9.5 allows an assertion failure and     denial of service in dname_pkt_copy via an invalid     packet.(CVE-2019-25037)

  - Unbound before 1.9.5 allows an integer overflow in a     size calculation in     dnscrypt/dnscrypt.c.(CVE-2019-25038)

  - Unbound before 1.9.5 allows an integer overflow in a     size calculation in respip/respip.c.(CVE-2019-25039)

  - Unbound before 1.9.5 allows an infinite loop via a     compressed name in dname_pkt_copy.(CVE-2019-25040)

  - Unbound before 1.9.5 allows an assertion failure via a     compressed name in dname_pkt_copy.(CVE-2019-25041)

  - Unbound before 1.9.5 allows an out-of-bounds write via     a compressed name in rdata_copy.(CVE-2019-25042)

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.

According to the versions of the unbound packages installed, the EulerOS installation on the remote host is affected by the following vulnerabilities :

  - ** DISPUTED ** Unbound before 1.9.5 allows configuration injection in create_unbound_ad_servers.sh upon a     successful man-in-the-middle attack against a cleartext HTTP session. NOTE: The vendor does not consider     this a vulnerability of the Unbound software. create_unbound_ad_servers.sh is a contributed script from     the community that facilitates automatic configuration creation. It is not part of the Unbound     installation. (CVE-2019-25031)

  - ** 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 the regional allocator via the ALIGN_UP     macro. 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-2019-25033)

  - ** 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)

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.

The version of unbound installed on the remote host is prior to 1.7.3-15. It is, therefore, affected by multiple vulnerabilities as referenced in the ALAS2-2021-1683 advisory.

    2024-01-19: CVE-2019-25033 was added to this advisory.

    A flaw was found in unbound. An integer overflow in regional_alloc function may lead to a buffer overflow     of the allocated buffer if the size can be controlled by an attacker and can be big enough. The highest     threat from this vulnerability is to data confidentiality and integrity as well as service availability.
    (CVE-2019-25032)

    Unbound before 1.9.5 allows an integer overflow in the regional allocator via the ALIGN_UP macro. 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-2019-25033)

    A flaw was found in unbound. An integer overflow in the sldns_str2wire_dname_buf_origin function may lead     to a buffer overflow. The highest threat from this vulnerability is to data confidentiality and integrity     as well as service availability. (CVE-2019-25034)

    A flaw was found in unbound. An out-of-bounds write in the sldns_bget_token_par function may be abused by     a remote attacker. The highest threat from this vulnerability is to data confidentiality and integrity as     well as service availability. (CVE-2019-25035)

    A flaw was found in unbound. A reachable assertion in the synth_cname function can be triggered by sending     invalid packets to the server. If asserts are disabled during compilation, this issue might lead to an     out-of-bounds write in dname_pkt_copy function. The highest threat from this vulnerability is to data     confidentiality and integrity as well as service availability. (CVE-2019-25036)

    A flaw was found in unbound. A reachable assertion in the dname_pkt_copy function can be triggered by     sending invalid packets to the server. The highest threat from this vulnerability is to service     availability. (CVE-2019-25037)

    A flaw was found in unbound. An integer overflow in dnsc_load_local_data function may lead to a buffer     overflow of the allocated buffer if the size can be controlled by an attacker. The highest threat from     this vulnerability is to data confidentiality and integrity as well as service availability.
    (CVE-2019-25038)

    A flaw was found in unbound. An integer overflow in ub_packed_rrset_key function may lead to a buffer     overflow of the allocated buffer if the size can be controlled by an attacker. The highest threat from     this vulnerability is to data confidentiality and integrity as well as service availability.
    (CVE-2019-25039)

    A flaw was found in unbound. An infinite loop in dname_pkt_copy function could be triggered by a remote     attacker. The highest threat from this vulnerability is to service availability. (CVE-2019-25040)

    A flaw was found in unbound. A reachable assertion in the dname_pkt_copy function can be triggered through     compressed names. The highest threat from this vulnerability is to service availability. (CVE-2019-25041)

    A flaw was found in unbound. An out-of-bounds write in the rdata_copy function may be abused by a remote     attacker. The highest threat from this vulnerability is to data confidentiality and integrity as well as     service availability. (CVE-2019-25042)

    A symbolic link traversal vulnerability was found in unbound in the way it writes its PID file while     starting up. This flaw allows a local attacker with access to the unbound user to set up a link to another     file, owned by root, and make unbound overwrite it during its next restart, destroying the original     content. The highest threat from this vulnerability is integrity. (CVE-2020-28935)

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

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
149745	CentOS 8 : unbound (CESA-2021:1853)	Nessus	CentOS Local Security Checks	5/19/2021	6/2/2021	critical
149920	Photon OS 1.0: Unbound PHSA-2021-1.0-0390	Nessus	PhotonOS Local Security Checks	5/26/2021	5/26/2021	critical
152284	EulerOS 2.0 SP9 : unbound (EulerOS-SA-2021-2259)	Nessus	Huawei Local Security Checks	8/9/2021	12/6/2023	critical
152307	EulerOS 2.0 SP9 : unbound (EulerOS-SA-2021-2285)	Nessus	Huawei Local Security Checks	8/9/2021	12/6/2023	critical
154384	EulerOS 2.0 SP3 : unbound (EulerOS-SA-2021-2620)	Nessus	Huawei Local Security Checks	10/25/2021	10/25/2021	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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