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Vulnerability Summary
A high-severity vulnerability has been recently disclosed in most modern versions of the Linux kernel. This vulnerability could allow an attacker with non-root shell access to elevate their privileges to that of a root user. The vulnerability is known as “Dirty COW”.
Details
CVE-2016-5195, aka “Dirty COW”
Dirty COW attack against the Linux kernel – Dirty COW allows an attacker to exploit a race condition in the Linux kernel’s memory subsystem. This allows an unprivileged shell user to gain write access to otherwise read-only memory which in turn allows the attacker to potentially gain root privileges and control the system.
Published
Last Update: 3/11/2022
Initial Public Release: 10/26/2016
Advisory ID: PLYGN16-06
CVE ID: CVE-2016-5195
CVSS Score: 7.8
CVSS: 3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Product Affected
| PRODUCT | STATUS |
|---|---|
| Media Manager – All versions | Not vulnerable |
| CX5000 – All versions | Not vulnerable |
| CX Product Line – All versions | Not vulnerable |
| RealPresence Mobile – All versions | Not vulnerable |
| RealPresence Desktop – All versions | Not vulnerable |
| RealPresence Group Series – Allversions | No shell available to non-privilegedusers to exploit Dirty Cow |
| RealPresence Touch – All versions | No shell available to non-privilegedusers to exploit Dirty Cow |
| Poly Touch Control – All versions | No shell available to non-privilegedusers to exploit Dirty Cow |
| HDX – All versions | No shell available to non-privilegedusers to exploit Dirty Cow |
| Video Border Proxy (VBP) – Allversions | No shell available to non-privilegedusers to exploit Dirty Cow |
| Video Border Proxy (VBP) – Allversions | No shell available to non-privilegedusers to exploit Dirty Cow |
| ISDN Gateway – All versions | No shell available to non-privilegedusers to exploit Dirty Cow |
| Poly Phones (VVX, SPIP, SSIP, Trio) – All versions | No shell available to non-privilegedusers to exploit Dirty Cow |
| RealPresence Debut – All versions | No shell available to non-privilegedusers to exploit Dirty Cow |
| RealAccess – All versions | No shell available to non-privilegedusers to exploit Dirty Cow |
| Video Border Proxy (VBP) – Allversions | No shell available to non-privilegedusers to exploit Dirty Cow |
| RealPresence Resource Manager – Allversions | No shell available to non-privilegedusers to exploit Dirty Cow |
| RealPresence DMA – All versions | No shell available to non-privilegedusers to exploit Dirty Cow |
| RealPresence Access Director – Allversions | No shell available to non-privilegedusers to exploit Dirty Cow |
Solution
Poly recommends that customers disable telnet/ssh shell access for all products.
Furthermore, Poly recommends that customer evaluate network access control lists, firewalls, and other network protections to ensure that they have been deployed in a manner that is consistent with security best practices.
The risk presented by this potential vulnerability to Poly products, as well as other networked devices, may be mitigated by these controls. Customers should also ensure that Poly products have been configured as recommended by Poly implementation guides. Customers may wish to implement additional event monitoring and review until such time that an update is installed.
Workaround
There is no workaround.
Contact
Any customer using an affected system who is concerned about this vulnerability within their deployment should contact Poly Technical Support – (888) 248-4143, (916) 928-7561, or visit the Poly Support Site.
Revision History
| VERSION | DATE | DESCRIPTION |
|---|---|---|
| 1.0 | 10/26/2016 | Original publication |
| 1.1 | 11/3/2016 | Additional Details / Acknowledgement |
| 2.0 | 3/11/2022 | Format Changes |
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