Nlnetlabs Unbound
By the Year
In 2024 there have been 1 vulnerability in Nlnetlabs Unbound with an average score of 7.5 out of ten. Unbound did not have any published security vulnerabilities last year. That is, 1 more vulnerability have already been reported in 2024 as compared to last year.
| Year | Vulnerabilities | Average Score |
|---|---|---|
| 2024 | 1 | 7.50 |
| 2023 | 0 | 0.00 |
| 2022 | 3 | 6.83 |
| 2021 | 12 | 8.71 |
| 2020 | 3 | 6.83 |
| 2019 | 2 | 7.40 |
| 2018 | 0 | 0.00 |
It may take a day or so for new Unbound vulnerabilities to show up in the stats or in the list of recent security vulnerabilties. Additionally vulnerabilities may be tagged under a different product or component name.
Recent Nlnetlabs Unbound Security Vulnerabilities
Certain DNSSEC aspects of the DNS protocol (in RFC 4033, 4034, 4035, 6840, and related RFCs)
CVE-2023-50387
7.5 - High
- February 14, 2024
Certain DNSSEC aspects of the DNS protocol (in RFC 4033, 4034, 4035, 6840, and related RFCs) allow remote attackers to cause a denial of service (CPU consumption) via one or more DNSSEC responses, aka the "KeyTrap" issue. One of the concerns is that, when there is a zone with many DNSKEY and RRSIG records, the protocol specification implies that an algorithm must evaluate all combinations of DNSKEY and RRSIG records.
Allocation of Resources Without Limits or Throttling
A vulnerability named 'Non-Responsive Delegation Attack' (NRDelegation Attack) has been discovered in various DNS resolving software
CVE-2022-3204
7.5 - High
- September 26, 2022
A vulnerability named 'Non-Responsive Delegation Attack' (NRDelegation Attack) has been discovered in various DNS resolving software. The NRDelegation Attack works by having a malicious delegation with a considerable number of non responsive nameservers. The attack starts by querying a resolver for a record that relies on those unresponsive nameservers. The attack can cause a resolver to spend a lot of time/resources resolving records under a malicious delegation point where a considerable number of unresponsive NS records reside. It can trigger high CPU usage in some resolver implementations that continually look in the cache for resolved NS records in that delegation. This can lead to degraded performance and eventually denial of service in orchestrated attacks. Unbound does not suffer from high CPU usage, but resources are still needed for resolving the malicious delegation. Unbound will keep trying to resolve the record until hard limits are reached. Based on the nature of the attack and the replies, different limits could be reached. From version 1.16.3 on, Unbound introduces fixes for better performance when under load, by cutting opportunistic queries for nameserver discovery and DNSKEY prefetching and limiting the number of times a delegation point can issue a cache lookup for missing records.
Resource Exhaustion
NLnet Labs Unbound, up to and including version 1.16.1, is vulnerable to a novel type of the "ghost domain names" attack
CVE-2022-30699
6.5 - Medium
- August 01, 2022
NLnet Labs Unbound, up to and including version 1.16.1, is vulnerable to a novel type of the "ghost domain names" attack. The vulnerability works by targeting an Unbound instance. Unbound is queried for a rogue domain name when the cached delegation information is about to expire. The rogue nameserver delays the response so that the cached delegation information is expired. Upon receiving the delayed answer containing the delegation information, Unbound overwrites the now expired entries. This action can be repeated when the delegation information is about to expire making the rogue delegation information ever-updating. From version 1.16.2 on, Unbound stores the start time for a query and uses that to decide if the cached delegation information can be overwritten.
Insufficient Session Expiration
NLnet Labs Unbound, up to and including version 1.16.1 is vulnerable to a novel type of the "ghost domain names" attack
CVE-2022-30698
6.5 - Medium
- August 01, 2022
NLnet Labs Unbound, up to and including version 1.16.1 is vulnerable to a novel type of the "ghost domain names" attack. The vulnerability works by targeting an Unbound instance. Unbound is queried for a subdomain of a rogue domain name. The rogue nameserver returns delegation information for the subdomain that updates Unbound's delegation cache. This action can be repeated before expiry of the delegation information by querying Unbound for a second level subdomain which the rogue nameserver provides new delegation information. Since Unbound is a child-centric resolver, the ever-updating child delegation information can keep a rogue domain name resolvable long after revocation. From version 1.16.2 on, Unbound checks the validity of parent delegation records before using cached delegation information.
Insufficient Session Expiration
Unbound before 1.9.5 allows an out-of-bounds write in sldns_bget_token_par
CVE-2019-25035
9.8 - Critical
- April 27, 2021
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
Memory Corruption
Unbound before 1.9.5 allows an out-of-bounds write via a compressed name in rdata_copy
CVE-2019-25042
9.8 - Critical
- April 27, 2021
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
Memory Corruption
Unbound before 1.9.5 allows an infinite loop via a compressed name in dname_pkt_copy
CVE-2019-25040
7.5 - High
- April 27, 2021
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
Infinite Loop
Unbound before 1.9.5 allows an integer overflow in the regional allocator via the ALIGN_UP macro
CVE-2019-25033
9.8 - Critical
- April 27, 2021
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
Integer Overflow or Wraparound
Unbound before 1.9.5 allows an integer overflow in a size calculation in dnscrypt/dnscrypt.c
CVE-2019-25038
9.8 - Critical
- April 27, 2021
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
Integer Overflow or Wraparound
Unbound before 1.9.5 allows an assertion failure and denial of service in dname_pkt_copy via an invalid packet
CVE-2019-25037
7.5 - High
- April 27, 2021
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
assertion failure
Unbound before 1.9.5 allows an assertion failure and denial of service in synth_cname
CVE-2019-25036
7.5 - High
- April 27, 2021
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
assertion failure
Unbound before 1.9.5
CVE-2019-25031
5.9 - Medium
- April 27, 2021
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
Injection
Unbound before 1.9.5 allows an assertion failure via a compressed name in dname_pkt_copy
CVE-2019-25041
7.5 - High
- April 27, 2021
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
assertion failure
Unbound before 1.9.5 allows an integer overflow in a size calculation in respip/respip.c
CVE-2019-25039
9.8 - Critical
- April 27, 2021
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
Integer Overflow or Wraparound
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
9.8 - Critical
- April 27, 2021
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
Integer Overflow or Wraparound
Unbound before 1.9.5 allows an integer overflow in the regional allocator via regional_alloc
CVE-2019-25032
9.8 - Critical
- April 27, 2021
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
Integer Overflow or Wraparound
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
CVE-2020-28935
5.5 - Medium
- December 07, 2020
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.
insecure temporary file
Unbound before 1.10.1 has an infinite loop
CVE-2020-12663
7.5 - High
- May 19, 2020
Unbound before 1.10.1 has an infinite loop via malformed DNS answers received from upstream servers.
Infinite Loop
Unbound before 1.10.1 has Insufficient Control of Network Message Volume, aka an "NXNSAttack" issue
CVE-2020-12662
7.5 - High
- May 19, 2020
Unbound before 1.10.1 has Insufficient Control of Network Message Volume, aka an "NXNSAttack" issue. This is triggered by random subdomains in the NSDNAME in NS records.
Stack Exhaustion
Unbound 1.6.4 through 1.9.4 contain a vulnerability in the ipsec module
CVE-2019-18934
7.3 - High
- November 19, 2019
Unbound 1.6.4 through 1.9.4 contain a vulnerability in the ipsec module that can cause shell code execution after receiving a specially crafted answer. This issue can only be triggered if unbound was compiled with `--enable-ipsecmod` support, and ipsecmod is enabled and used in the configuration.
Shell injection
Unbound before 1.9.4 accesses uninitialized memory, which allows remote attackers to trigger a crash via a crafted NOTIFY query
CVE-2019-16866
7.5 - High
- October 03, 2019
Unbound before 1.9.4 accesses uninitialized memory, which allows remote attackers to trigger a crash via a crafted NOTIFY query. The source IP address of the query must match an access-control rule.
Improper Handling of Exceptional Conditions
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