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CVE-2020-11091— Weave Net clusters susceptible to MitM attacks via IPv6 rogue router advertisements

Quick assessment

Affected
weaveworks Weave
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Weaveworks Weave Net是英国Weaveworks公司的一款云原生网络工具包。 Weaveworks Weave Net 2.6.3之前版本中存在安全漏洞。目前尚无此漏洞的相关信息，请随时关注CNNVD或厂商公告。

CVSS 5.8 · Medium EPSS 0.86% · P57
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I. Basic Information for CVE-2020-11091

Vulnerability Information
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Vulnerability Title
Weave Net clusters susceptible to MitM attacks via IPv6 rogue router advertisements
Source: CVE Program / CVE List V5
Vulnerability Description
In Weave Net before version 2.6.3, an attacker able to run a process as root in a container is able to respond to DNS requests from the host and thereby insert themselves as a fake service. In a cluster with an IPv4 internal network, if IPv6 is not totally disabled on the host (via ipv6.disable=1 on the kernel cmdline), it will be either unconfigured or configured on some interfaces, but it's pretty likely that ipv6 forwarding is disabled, ie /proc/sys/net/ipv6/conf//forwarding == 0. Also by default, /proc/sys/net/ipv6/conf//accept_ra == 1. The combination of these 2 sysctls means that the host accepts router advertisements and configure the IPv6 stack using them. By sending rogue router advertisements, an attacker can reconfigure the host to redirect part or all of the IPv6 traffic of the host to the attacker controlled container. Even if there was no IPv6 traffic before, if the DNS returns A (IPv4) and AAAA (IPv6) records, many HTTP libraries will try to connect via IPv6 first then fallback to IPv4, giving an opportunity to the attacker to respond. If by chance you also have on the host a vulnerability like last year's RCE in apt (CVE-2019-3462), you can now escalate to the host. Weave Net version 2.6.3 disables the accept_ra option on the veth devices that it creates.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:C/C:N/I:H/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
不恰当地信任反向DNS
Source: CVE Program / CVE List V5
Vulnerability Title
Weaveworks Weave Net 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Weaveworks Weave Net是英国Weaveworks公司的一款云原生网络工具包。 Weaveworks Weave Net 2.6.3之前版本中存在安全漏洞。目前尚无此漏洞的相关信息，请随时关注CNNVD或厂商公告。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
weaveworks Weave < 2.6.3 -

II. Public POCs for CVE-2020-11091

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III. Intelligence Information for CVE-2020-11091

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Patches & Fixes for CVE-2020-11091 (1)

Vendor Advisories for CVE-2020-11091 (1)

IV. Related Vulnerabilities

Same product: Weave
Same vendor: weaveworks
Same weakness: CWE-350

V. Comments for CVE-2020-11091

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