https://ostif.org/our-audit-of-unbound-dns-by-x41-d-sec-full-results/

[debian-lts-announce] 20210506 [SECURITY] [DLA 2652-1] unbound1.9 security update

https://security.netapp.com/advisory/ntap-20210507-0007/

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.

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

  - 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)

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

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

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

  - 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 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)

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 :

  - 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 Virtualization installation on the remote host is affected by the following vulnerabilities :

  - ** 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)

  - ** 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 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 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 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 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 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     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)

  - 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)

  - ** 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     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)

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 package installed, the EulerOS Virtualization for ARM 64 installation on the remote host is affected by the following vulnerabilities :

  - 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 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 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. 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 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. 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. 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. 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. 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 integer overflow in the     regional allocator via the ALIGN_UP macro may lead to a     buffer overflow 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-2019-25033)

  - 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)

  - A flaw was found in unbound. The     create_unbound_ad_servers.sh bash script does not     properly sanitize input data, which is retrieved using     an unencrypted, unauthenticated HTTP request, before     writing the configuration file allowing a     man-in-the-middle attack. The highest threat from this     vulnerability is to data integrity and system     availability.(CVE-2019-25031)

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.

  - ** 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 this issue but has instead relied only on the application's self-reported version number.

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

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

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

  - 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 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 respip/respip.c. (CVE-2019-25039)

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

  - 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 this issue but has instead relied only on the application's self-reported version number.

An update of the unbound package has been released.

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.

The remote Redhat Enterprise Linux 8 host has packages installed that are affected by multiple vulnerabilities as referenced in the RHSA-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.

Several security vulnerabilities have been discovered in Unbound, a validating, recursive, caching DNS resolver, by security researchers of X41 D-SEC located in Aachen, Germany. Integer overflows, assertion failures, an out-of-bound write and an infinite loop vulnerability may lead to a denial of service or have a negative impact on data confidentiality.

For Debian 9 stretch, these problems have been fixed in version 1.9.0-2+deb10u2~deb9u2.

We recommend that you upgrade your unbound1.9 packages.

For the detailed security status of unbound1.9 please refer to its security tracker page at:
https://security-tracker.debian.org/tracker/unbound1.9

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

The remote Ubuntu 18.04 LTS / 20.04 LTS host has packages installed that are affected by multiple vulnerabilities as referenced in the USN-4938-1 advisory.

  - 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)

  - 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 this issue but has instead relied only on the application's self-reported version number.

ID	Name	Product	Family	Severity
154384	EulerOS 2.0 SP3 : unbound (EulerOS-SA-2021-2620)	Nessus	Huawei Local Security Checks	critical
153267	EulerOS 2.0 SP2 : unbound (EulerOS-SA-2021-2436)	Nessus	Huawei Local Security Checks	critical
153069	EulerOS 2.0 SP5 : unbound (EulerOS-SA-2021-2351)	Nessus	Huawei Local Security Checks	critical
152401	EulerOS 2.0 SP8 : unbound (EulerOS-SA-2021-2318)	Nessus	Huawei Local Security Checks	critical
152307	EulerOS 2.0 SP9 : unbound (EulerOS-SA-2021-2285)	Nessus	Huawei Local Security Checks	critical
152284	EulerOS 2.0 SP9 : unbound (EulerOS-SA-2021-2259)	Nessus	Huawei Local Security Checks	critical
151556	EulerOS Virtualization 2.9.1 : unbound (EulerOS-SA-2021-2175)	Nessus	Huawei Local Security Checks	critical
151554	EulerOS Virtualization 2.9.0 : unbound (EulerOS-SA-2021-2210)	Nessus	Huawei Local Security Checks	critical
151309	EulerOS Virtualization for ARM 64 3.0.2.0 : unbound (EulerOS-SA-2021-2124)	Nessus	Huawei Local Security Checks	critical
151275	Amazon Linux 2 : unbound (ALAS-2021-1683)	Nessus	Amazon Linux Local Security Checks	critical
149938	Oracle Linux 8 : unbound (ELSA-2021-1853)	Nessus	Oracle Linux Local Security Checks	critical
149920	Photon OS 1.0: Unbound PHSA-2021-1.0-0390	Nessus	PhotonOS Local Security Checks	critical
149828	Photon OS 3.0: Unbound PHSA-2021-3.0-0236	Nessus	PhotonOS Local Security Checks	critical
149745	CentOS 8 : unbound (CESA-2021:1853)	Nessus	CentOS Local Security Checks	critical
149675	RHEL 8 : unbound (RHSA-2021:1853)	Nessus	Red Hat Local Security Checks	critical
149342	Debian DLA-2652-1 : unbound1.9 security update	Nessus	Debian Local Security Checks	critical
149324	Ubuntu 18.04 LTS / 20.04 LTS : Unbound vulnerabilities (USN-4938-1)	Nessus	Ubuntu Local Security Checks	critical

CVE-2019-25036

high

New! CVE Severity Now Using CVSS v3

Description

References

Details

Risk Information

CVSS v2

CVSS v3

Vulnerable Software

Configuration 1

Configuration 2

Tenable Plugins

critical

critical

critical

critical

critical

critical

critical

critical

critical

critical

critical

critical

critical

critical

critical

critical

critical