Search criteria
10 vulnerabilities by c-ares
CVE-2025-31498 (GCVE-0-2025-31498)
Vulnerability from cvelistv5 – Published: 2025-04-08 13:53 – Updated: 2025-04-08 18:40
VLAI?
Summary
c-ares is an asynchronous resolver library. From 1.32.3 through 1.34.4, there is a use-after-free in read_answers() when process_answer() may re-enqueue a query either due to a DNS Cookie Failure or when the upstream server does not properly support EDNS, or possibly on TCP queries if the remote closed the connection immediately after a response. If there was an issue trying to put that new transaction on the wire, it would close the connection handle, but read_answers() was still expecting the connection handle to be available to possibly dequeue other responses. In theory a remote attacker might be able to trigger this by flooding the target with ICMP UNREACHABLE packets if they also control the upstream nameserver and can return a result with one of those conditions, this has been untested. Otherwise only a local attacker might be able to change system behavior to make send()/write() return a failure condition. This vulnerability is fixed in 1.34.5.
Severity ?
CWE
- CWE-416 - Use After Free
Assigner
References
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CVE-2024-25629 (GCVE-0-2024-25629)
Vulnerability from cvelistv5 – Published: 2024-02-23 14:52 – Updated: 2025-02-13 17:40
VLAI?
Summary
c-ares is a C library for asynchronous DNS requests. `ares__read_line()` is used to parse local configuration files such as `/etc/resolv.conf`, `/etc/nsswitch.conf`, the `HOSTALIASES` file, and if using a c-ares version prior to 1.27.0, the `/etc/hosts` file. If any of these configuration files has an embedded `NULL` character as the first character in a new line, it can lead to attempting to read memory prior to the start of the given buffer which may result in a crash. This issue is fixed in c-ares 1.27.0. No known workarounds exist.
Severity ?
4.4 (Medium)
CWE
- CWE-127 - Buffer Under-read
Assigner
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CVE-2020-22217 (GCVE-0-2020-22217)
Vulnerability from cvelistv5 – Published: 2023-08-22 00:00 – Updated: 2024-10-03 19:59
VLAI?
Summary
Buffer overflow vulnerability in c-ares before 1_16_1 thru 1_17_0 via function ares_parse_soa_reply in ares_parse_soa_reply.c.
Severity ?
No CVSS data available.
CWE
- n/a
Assigner
References
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CVE-2023-32067 (GCVE-0-2023-32067)
Vulnerability from cvelistv5 – Published: 2023-05-25 22:49 – Updated: 2025-02-13 16:50
VLAI?
Summary
c-ares is an asynchronous resolver library. c-ares is vulnerable to denial of service. If a target resolver sends a query, the attacker forges a malformed UDP packet with a length of 0 and returns them to the target resolver. The target resolver erroneously interprets the 0 length as a graceful shutdown of the connection. This issue has been patched in version 1.19.1.
Severity ?
7.5 (High)
CWE
- CWE-400 - Uncontrolled Resource Consumption
Assigner
References
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CVE-2023-31147 (GCVE-0-2023-31147)
Vulnerability from cvelistv5 – Published: 2023-05-25 21:55 – Updated: 2025-02-13 16:49
VLAI?
Summary
c-ares is an asynchronous resolver library. When /dev/urandom or RtlGenRandom() are unavailable, c-ares uses rand() to generate random numbers used for DNS query ids. This is not a CSPRNG, and it is also not seeded by srand() so will generate predictable output. Input from the random number generator is fed into a non-compilant RC4 implementation and may not be as strong as the original RC4 implementation. No attempt is made to look for modern OS-provided CSPRNGs like arc4random() that is widely available. This issue has been fixed in version 1.19.1.
Severity ?
5.9 (Medium)
CWE
- CWE-330 - Use of Insufficiently Random Values
Assigner
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CVE-2023-31130 (GCVE-0-2023-31130)
Vulnerability from cvelistv5 – Published: 2023-05-25 21:45 – Updated: 2025-02-13 16:49
VLAI?
Summary
c-ares is an asynchronous resolver library. ares_inet_net_pton() is vulnerable to a buffer underflow for certain ipv6 addresses, in particular "0::00:00:00/2" was found to cause an issue. C-ares only uses this function internally for configuration purposes which would require an administrator to configure such an address via ares_set_sortlist(). However, users may externally use ares_inet_net_pton() for other purposes and thus be vulnerable to more severe issues. This issue has been fixed in 1.19.1.
Severity ?
4.1 (Medium)
CWE
- CWE-124 - Buffer Underwrite ('Buffer Underflow')
Assigner
References
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CVE-2023-31124 (GCVE-0-2023-31124)
Vulnerability from cvelistv5 – Published: 2023-05-25 21:09 – Updated: 2025-02-13 16:49
VLAI?
Summary
c-ares is an asynchronous resolver library. When cross-compiling c-ares and using the autotools build system, CARES_RANDOM_FILE will not be set, as seen when cross compiling aarch64 android. This will downgrade to using rand() as a fallback which could allow an attacker to take advantage of the lack of entropy by not using a CSPRNG. This issue was patched in version 1.19.1.
Severity ?
CWE
- CWE-330 - Use of Insufficiently Random Values
Assigner
References
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CVE-2020-14354 (GCVE-0-2020-14354)
Vulnerability from cvelistv5 – Published: 2021-05-13 13:38 – Updated: 2024-08-04 12:39
VLAI?
Summary
A possible use-after-free and double-free in c-ares lib version 1.16.0 if ares_destroy() is called prior to ares_getaddrinfo() completing. This flaw possibly allows an attacker to crash the service that uses c-ares lib. The highest threat from this vulnerability is to this service availability.
Severity ?
No CVSS data available.
CWE
- CWE-120 - >CWE-416
Assigner
References
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CVE-2017-1000381 (GCVE-0-2017-1000381)
Vulnerability from cvelistv5 – Published: 2017-07-07 17:00 – Updated: 2024-08-05 22:00
VLAI?
Summary
The c-ares function `ares_parse_naptr_reply()`, which is used for parsing NAPTR responses, could be triggered to read memory outside of the given input buffer if the passed in DNS response packet was crafted in a particular way.
Severity ?
No CVSS data available.
CWE
- n/a
Assigner
References
| URL | Tags | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
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CVE-2016-5180 (GCVE-0-2016-5180)
Vulnerability from cvelistv5 – Published: 2016-10-03 15:00 – Updated: 2024-08-06 00:53
VLAI?
Summary
Heap-based buffer overflow in the ares_create_query function in c-ares 1.x before 1.12.0 allows remote attackers to cause a denial of service (out-of-bounds write) or possibly execute arbitrary code via a hostname with an escaped trailing dot.
Severity ?
No CVSS data available.
CWE
- n/a
Assigner
References
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