An update of the unbound package has been released.

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.

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.

ID	名称	产品	系列	发布时间	最近更新时间	严重程度
149828	Photon OS 3.0: Unbound PHSA-2021-3.0-0236	Nessus	PhotonOS Local Security Checks	2021/5/21	2021/5/21	critical
149938	Oracle Linux 8 : unbound (ELSA-2021-1853)	Nessus	Oracle Linux Local Security Checks	2021/5/26	2021/5/26	critical
184575	Rocky Linux 8 : unbound (RLSA-2021:1853)	Nessus	Rocky Linux Local Security Checks	2023/11/6	2023/11/6	critical

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