rhsa-2022_0632
Vulnerability from csaf_redhat
Published
2022-02-22 15:16
Modified
2024-11-22 16:05
Summary
Red Hat Security Advisory: unbound security update
Notes
Topic
An update for unbound is now available for Red Hat Enterprise Linux 8.2 Extended Update Support.
Red Hat Product Security has rated this update as having a security impact of Moderate. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section.
Details
The unbound packages provide a validating, recursive, and caching DNS or DNSSEC resolver.
Security Fix(es):
* 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)
For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.
Terms of Use
This content is licensed under the Creative Commons Attribution 4.0 International License (https://creativecommons.org/licenses/by/4.0/). If you distribute this content, or a modified version of it, you must provide attribution to Red Hat Inc. and provide a link to the original.
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"text": "unbound: out-of-bounds write in sldns_bget_token_par",
"title": "Vulnerability summary"
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{
"category": "other",
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"title": "Statement"
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{
"category": "general",
"text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
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"title": "unbound: out-of-bounds write in sldns_bget_token_par"
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{
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"ids": [
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"text": "1954782"
}
],
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{
"category": "description",
"text": "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.",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "unbound: assertion failure and denial of service in synth_cname",
"title": "Vulnerability summary"
},
{
"category": "other",
"text": "This issue could not be triggered by running unbound regularly, but only by injecting the packet directly to the vulnerable function through fuzzing. For this reason its Impact is Moderate. Upstream has also disputed this CVE.",
"title": "Statement"
},
{
"category": "general",
"text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
"title": "CVSS score applicability"
}
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{
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"title": "Vulnerability description"
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{
"category": "summary",
"text": "unbound: integer overflow in a size calculation in respip/respip.c",
"title": "Vulnerability summary"
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{
"category": "other",
"text": "There is no available reproducer or proof of concept for this issue, nor it was ever proven the integer overflow can lead to a buffer overflow in practice. Indeed in the original report this issue was considered one that might not be triggered and for this reason its Impact is Moderate. Upstream has also disputed this CVE.",
"title": "Statement"
},
{
"category": "general",
"text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
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"title": "unbound: integer overflow in a size calculation in respip/respip.c"
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{
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"id": "CWE-835",
"name": "Loop with Unreachable Exit Condition (\u0027Infinite Loop\u0027)"
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"ids": [
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"text": "1954799"
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],
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{
"category": "description",
"text": "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.",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "unbound: infinite loop via a compressed name in dname_pkt_copy",
"title": "Vulnerability summary"
},
{
"category": "other",
"text": "There is no available reproducer or proof of concept for this issue, nor it was ever proven the infinite loop can be triggered in practice. Indeed in the original report this issue was considered one that might not be triggered and for this reason its Impact is Moderate. Upstream has also disputed this CVE.",
"title": "Statement"
},
{
"category": "general",
"text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
"title": "CVSS score applicability"
}
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{
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"name": "Improper Link Resolution Before File Access (\u0027Link Following\u0027)"
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"ids": [
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{
"category": "description",
"text": "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.",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "unbound: symbolic link traversal when writing PID file",
"title": "Vulnerability summary"
},
{
"category": "general",
"text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
"title": "CVSS score applicability"
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"restart_required": {
"category": "none"
},
"url": "https://access.redhat.com/errata/RHSA-2022:0632"
},
{
"category": "workaround",
"details": "If SELinux is enabled in Enforcing mode (the default value in Red Hat Enterprise Linux 8), this kind of attack is prevented as unbound would be blocked from accessing the symbolic link file.",
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"scores": [
{
"cvss_v3": {
"attackComplexity": "LOW",
"attackVector": "LOCAL",
"availabilityImpact": "NONE",
"baseScore": 4.4,
"baseSeverity": "MEDIUM",
"confidentialityImpact": "NONE",
"integrityImpact": "HIGH",
"privilegesRequired": "HIGH",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:H/A:N",
"version": "3.1"
},
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],
"threats": [
{
"category": "impact",
"details": "Low"
}
],
"title": "unbound: symbolic link traversal when writing PID file"
}
]
}
Loading…
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Sightings
| Author | Source | Type | Date |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
- Confirmed: The vulnerability is confirmed from an analyst perspective.
- Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
- Patched: This vulnerability was successfully patched by the user reporting the sighting.
- Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
- Not confirmed: The user expresses doubt about the veracity of the vulnerability.
- Not patched: This vulnerability was not successfully patched by the user reporting the sighting.