RHSA-2016_1631
Vulnerability from csaf_redhat - Published: 2016-08-18 18:22 - Updated: 2024-11-14 20:48Summary
Red Hat Security Advisory: realtime-kernel security and bug fix update
Severity
Important
Notes
Topic: An update for kernel-rt is now available for Red Hat Enterprise MRG 2.5.
Red Hat Product Security has rated this update as having a security impact of Important. 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 kernel-rt packages provide the Real Time Linux Kernel, which enables fine-tuning for systems with extremely high determinism requirements.
It was found that the RFC 5961 challenge ACK rate limiting as implemented
in the Linux kernel's networking subsystem allowed an off-path attacker to
leak certain information about a given connection by creating congestion on
the global challenge ACK rate limit counter and then measuring the changes
by probing packets. An off-path attacker could use this flaw to either
terminate TCP connection and/or inject payload into non-secured TCP
connection between two endpoints on the network. (CVE-2016-5696, Important)
Red Hat would like to thank Yue Cao from Cyber Security Group in the CS
department of University of California, Riverside, for reporting this issue.
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.
It was found that the RFC 5961 challenge ACK rate limiting as implemented in the Linux kernel's networking subsystem allowed an off-path attacker to leak certain information about a given connection by creating congestion on the global challenge ACK rate limit counter and then measuring the changes by probing packets. An off-path attacker could use this flaw to either terminate TCP connection and/or inject payload into non-secured TCP connection between two endpoints on the network.
4.8 (Medium)
Affected products
Fixed
16 products
| Product | Identifier | Version | Remediation |
|---|---|---|---|
| Unresolved product id: 6Server-MRG-Realtime-2:kernel-rt-1:3.10.0-327.rt56.195.el6rt.src | — |
Vendor Fix
fix
|
|
| Unresolved product id: 6Server-MRG-Realtime-2:kernel-rt-1:3.10.0-327.rt56.195.el6rt.x86_64 | — |
Vendor Fix
fix
|
|
| Unresolved product id: 6Server-MRG-Realtime-2:kernel-rt-debug-1:3.10.0-327.rt56.195.el6rt.x86_64 | — |
Vendor Fix
fix
|
|
| Unresolved product id: 6Server-MRG-Realtime-2:kernel-rt-debug-debuginfo-1:3.10.0-327.rt56.195.el6rt.x86_64 | — |
Vendor Fix
fix
|
|
| Unresolved product id: 6Server-MRG-Realtime-2:kernel-rt-debug-devel-1:3.10.0-327.rt56.195.el6rt.x86_64 | — |
Vendor Fix
fix
|
|
| Unresolved product id: 6Server-MRG-Realtime-2:kernel-rt-debuginfo-1:3.10.0-327.rt56.195.el6rt.x86_64 | — |
Vendor Fix
fix
|
|
| Unresolved product id: 6Server-MRG-Realtime-2:kernel-rt-debuginfo-common-x86_64-1:3.10.0-327.rt56.195.el6rt.x86_64 | — |
Vendor Fix
fix
|
|
| Unresolved product id: 6Server-MRG-Realtime-2:kernel-rt-devel-1:3.10.0-327.rt56.195.el6rt.x86_64 | — |
Vendor Fix
fix
|
|
| Unresolved product id: 6Server-MRG-Realtime-2:kernel-rt-doc-1:3.10.0-327.rt56.195.el6rt.noarch | — |
Vendor Fix
fix
|
|
| Unresolved product id: 6Server-MRG-Realtime-2:kernel-rt-firmware-1:3.10.0-327.rt56.195.el6rt.noarch | — |
Vendor Fix
fix
|
|
| Unresolved product id: 6Server-MRG-Realtime-2:kernel-rt-trace-1:3.10.0-327.rt56.195.el6rt.x86_64 | — |
Vendor Fix
fix
|
|
| Unresolved product id: 6Server-MRG-Realtime-2:kernel-rt-trace-debuginfo-1:3.10.0-327.rt56.195.el6rt.x86_64 | — |
Vendor Fix
fix
|
|
| Unresolved product id: 6Server-MRG-Realtime-2:kernel-rt-trace-devel-1:3.10.0-327.rt56.195.el6rt.x86_64 | — |
Vendor Fix
fix
|
|
| Unresolved product id: 6Server-MRG-Realtime-2:kernel-rt-vanilla-1:3.10.0-327.rt56.195.el6rt.x86_64 | — |
Vendor Fix
fix
|
|
| Unresolved product id: 6Server-MRG-Realtime-2:kernel-rt-vanilla-debuginfo-1:3.10.0-327.rt56.195.el6rt.x86_64 | — |
Vendor Fix
fix
|
|
| Unresolved product id: 6Server-MRG-Realtime-2:kernel-rt-vanilla-devel-1:3.10.0-327.rt56.195.el6rt.x86_64 | — |
Vendor Fix
fix
|
Threats
Impact
Important
References
9 references
Acknowledgments
Cyber Security Group of the CS department of University of California in Riverside
Yue Cao
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{
"acknowledgments": [
{
"names": [
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],
"organization": "Cyber Security Group of the CS department of University of California in Riverside"
}
],
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"name": "Observable Discrepancy"
},
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"text": "1354708"
}
],
"notes": [
{
"category": "description",
"text": "It was found that the RFC 5961 challenge ACK rate limiting as implemented in the Linux kernel\u0027s networking subsystem allowed an off-path attacker to leak certain information about a given connection by creating congestion on the global challenge ACK rate limit counter and then measuring the changes by probing packets. An off-path attacker could use this flaw to either terminate TCP connection and/or inject payload into non-secured TCP connection between two endpoints on the network.",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "kernel: challenge ACK counter information disclosure.",
"title": "Vulnerability summary"
},
{
"category": "other",
"text": "This issue does not affect the Linux kernels as shipped with Red Hat Enterprise Linux 4 and 5.",
"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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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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