CVE-2024-3661

一、漏洞信息
漏洞编号：CVE-2024-3661
漏洞归属组件：dhcp
漏洞归属的版本：4.4.2,4.4.3
CVSS V3.0分值：
BaseScore：7.6 High
Vector：CVSS：3.0/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:L
漏洞简述：
DHCP can add routes to a client’s routing table via the classless static route option (121). VPN-based security solutions that rely on routes to redirect traffic can be forced to leak traffic over the physical interface. An attacker on the same local network can read, disrupt, or possibly modify network traffic that was expected to be protected by the VPN.
漏洞公开时间：2024-05-07 03:15:11
漏洞创建时间：2024-05-09 01:39:56
漏洞详情参考链接：
https://nvd.nist.gov/vuln/detail/CVE-2024-3661

更多参考(点击展开)

参考来源	参考链接	来源链接
9119a7d8-5eab-497f-8521-727c672e3725	https://arstechnica.com/security/2024/05/novel-attack-against-virtually-all-vpn-apps-neuters-their-entire-purpose/
9119a7d8-5eab-497f-8521-727c672e3725	https://datatracker.ietf.org/doc/html/rfc2131#section-7
9119a7d8-5eab-497f-8521-727c672e3725	https://datatracker.ietf.org/doc/html/rfc3442#section-7
9119a7d8-5eab-497f-8521-727c672e3725	https://issuetracker.google.com/issues/263721377
9119a7d8-5eab-497f-8521-727c672e3725	https://krebsonsecurity.com/2024/05/why-your-vpn-may-not-be-as-secure-as-it-claims/
9119a7d8-5eab-497f-8521-727c672e3725	https://lowendtalk.com/discussion/188857/a-rogue-dhcp-server-within-your-network-can-and-will-hijack-your-vpn-traffic
9119a7d8-5eab-497f-8521-727c672e3725	https://mullvad.net/en/blog/evaluating-the-impact-of-tunnelvision
9119a7d8-5eab-497f-8521-727c672e3725	https://news.ycombinator.com/item?id=40279632
9119a7d8-5eab-497f-8521-727c672e3725	https://news.ycombinator.com/item?id=40284111
9119a7d8-5eab-497f-8521-727c672e3725	https://tunnelvisionbug.com/
9119a7d8-5eab-497f-8521-727c672e3725	https://www.agwa.name/blog/post/hardening_openvpn_for_def_con
9119a7d8-5eab-497f-8521-727c672e3725	https://www.leviathansecurity.com/research/tunnelvision
9119a7d8-5eab-497f-8521-727c672e3725	https://www.theregister.com/2024/05/07/vpn_tunnelvision_dhcp/
9119a7d8-5eab-497f-8521-727c672e3725	https://www.zscaler.com/blogs/security-research/cve-2024-3661-k-tunnelvision-exposes-vpn-bypass-vulnerability
suse_bugzilla	http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2024-3661	https://bugzilla.suse.com/show_bug.cgi?id=1224052
suse_bugzilla	https://www.cve.org/CVERecord?id=CVE-2024-3661	https://bugzilla.suse.com/show_bug.cgi?id=1224052
suse_bugzilla	https://datatracker.ietf.org/doc/html/rfc2131#section-7	https://bugzilla.suse.com/show_bug.cgi?id=1224052
suse_bugzilla	https://datatracker.ietf.org/doc/html/rfc3442#section-7	https://bugzilla.suse.com/show_bug.cgi?id=1224052
suse_bugzilla	https://www.leviathansecurity.com/blog/tunnelvision	https://bugzilla.suse.com/show_bug.cgi?id=1224052
suse_bugzilla	https://tunnelvisionbug.com/	https://bugzilla.suse.com/show_bug.cgi?id=1224052
suse_bugzilla	https://www.leviathansecurity.com/research/tunnelvision	https://bugzilla.suse.com/show_bug.cgi?id=1224052
suse_bugzilla	https://news.ycombinator.com/item?id=40279632	https://bugzilla.suse.com/show_bug.cgi?id=1224052
suse_bugzilla	https://arstechnica.com/security/2024/05/novel-attack-against-virtually-all-vpn-apps-neuters-their-entire-purpose/	https://bugzilla.suse.com/show_bug.cgi?id=1224052
suse_bugzilla	https://issuetracker.google.com/issues/263721377	https://bugzilla.suse.com/show_bug.cgi?id=1224052
suse_bugzilla	https://krebsonsecurity.com/2024/05/why-your-vpn-may-not-be-as-secure-as-it-claims/	https://bugzilla.suse.com/show_bug.cgi?id=1224052
suse_bugzilla	https://lowendtalk.com/discussion/188857/a-rogue-dhcp-server-within-your-network-can-and-will-hijack-your-vpn-traffic	https://bugzilla.suse.com/show_bug.cgi?id=1224052
suse_bugzilla	https://mullvad.net/en/blog/evaluating-the-impact-of-tunnelvision	https://bugzilla.suse.com/show_bug.cgi?id=1224052
suse_bugzilla	https://news.ycombinator.com/item?id=40284111	https://bugzilla.suse.com/show_bug.cgi?id=1224052
suse_bugzilla	https://www.agwa.name/blog/post/hardening_openvpn_for_def_con	https://bugzilla.suse.com/show_bug.cgi?id=1224052
suse_bugzilla	https://www.zscaler.com/blogs/security-research/cve-2024-3661-k-tunnelvision-exposes-vpn-bypass-vulnerability	https://bugzilla.suse.com/show_bug.cgi?id=1224052
debian		https://security-tracker.debian.org/tracker/CVE-2024-3661
cve_search		https://datatracker.ietf.org/doc/html/rfc2131#section-7
cve_search		https://datatracker.ietf.org/doc/html/rfc3442#section-7
cve_search		https://tunnelvisionbug.com/
cve_search		https://www.leviathansecurity.com/research/tunnelvision
cve_search		https://news.ycombinator.com/item?id=40279632
cve_search		https://arstechnica.com/security/2024/05/novel-attack-against-virtually-all-vpn-apps-neuters-their-entire-purpose/
cve_search		https://krebsonsecurity.com/2024/05/why-your-vpn-may-not-be-as-secure-as-it-claims/
cve_search		https://issuetracker.google.com/issues/263721377
cve_search		https://mullvad.net/en/blog/evaluating-the-impact-of-tunnelvision
cve_search		https://www.zscaler.com/blogs/security-research/cve-2024-3661-k-tunnelvision-exposes-vpn-bypass-vulnerability
cve_search		https://lowendtalk.com/discussion/188857/a-rogue-dhcp-server-within-your-network-can-and-will-hijack-your-vpn-traffic
cve_search		https://news.ycombinator.com/item?id=40284111
cve_search		https://www.agwa.name/blog/post/hardening_openvpn_for_def_con
cve_search		https://www.theregister.com/2024/05/07/vpn_tunnelvision_dhcp/
ubuntu	https://www.cve.org/CVERecord?id=CVE-2024-3661	https://ubuntu.com/security/CVE-2024-3661
ubuntu	https://datatracker.ietf.org/doc/html/rfc2131#section-7	https://ubuntu.com/security/CVE-2024-3661
ubuntu	https://datatracker.ietf.org/doc/html/rfc3442#section-7	https://ubuntu.com/security/CVE-2024-3661
ubuntu	https://tunnelvisionbug.com/	https://ubuntu.com/security/CVE-2024-3661
ubuntu	https://www.leviathansecurity.com/research/tunnelvision	https://ubuntu.com/security/CVE-2024-3661
ubuntu	https://news.ycombinator.com/item?id=40279632	https://ubuntu.com/security/CVE-2024-3661
ubuntu	https://arstechnica.com/security/2024/05/novel-attack-against-virtually-all-vpn-apps-neuters-their-entire-purpose/	https://ubuntu.com/security/CVE-2024-3661
ubuntu	https://krebsonsecurity.com/2024/05/why-your-vpn-may-not-be-as-secure-as-it-claims/	https://ubuntu.com/security/CVE-2024-3661
ubuntu	https://issuetracker.google.com/issues/263721377	https://ubuntu.com/security/CVE-2024-3661
ubuntu	https://mullvad.net/en/blog/evaluating-the-impact-of-tunnelvision	https://ubuntu.com/security/CVE-2024-3661
ubuntu	https://www.zscaler.com/blogs/security-research/cve-2024-3661-k-tunnelvision-exposes-vpn-bypass-vulnerability	https://ubuntu.com/security/CVE-2024-3661
ubuntu	https://lowendtalk.com/discussion/188857/a-rogue-dhcp-server-within-your-network-can-and-will-hijack-your-vpn-traffic	https://ubuntu.com/security/CVE-2024-3661
ubuntu	https://news.ycombinator.com/item?id=40284111	https://ubuntu.com/security/CVE-2024-3661
ubuntu	https://www.agwa.name/blog/post/hardening_openvpn_for_def_con	https://ubuntu.com/security/CVE-2024-3661
ubuntu	https://nvd.nist.gov/vuln/detail/CVE-2024-3661	https://ubuntu.com/security/CVE-2024-3661
ubuntu	https://launchpad.net/bugs/cve/CVE-2024-3661	https://ubuntu.com/security/CVE-2024-3661
ubuntu	https://security-tracker.debian.org/tracker/CVE-2024-3661	https://ubuntu.com/security/CVE-2024-3661
9119a7d8-5eab-497f-8521-727c672e3725	https://www.leviathansecurity.com/blog/tunnelvision

漏洞分析指导链接：
https://gitee.com/openeuler/cve-manager/blob/master/cve-vulner-manager/doc/md/manual.md
漏洞数据来源:
openBrain开源漏洞感知系统
漏洞补丁信息：

详情(点击展开)

无

二、漏洞分析结构反馈
影响性分析说明：
按照设计，DHCP协议不对消息进行身份验证，包括诸如无类别静态路由选项（121）在内。具有发送DHCP消息能力的攻击者可以操纵路由以重定向VPN流量，从而允许攻击者读取、干扰或可能修改本应由VPN保护的网络流量。许多基于IP路由的VPN系统都容易受到此类攻击。
openEuler评分：
7.6
Vector：CVSS：3.0/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:L
受影响版本排查(受影响/不受影响)：
1.master(4.4.3):受影响
2.openEuler-20.03-LTS-SP1(4.4.2):受影响
3.openEuler-20.03-LTS-SP4(4.4.2):受影响
4.openEuler-22.03-LTS(4.4.2):受影响
5.openEuler-22.03-LTS-Next(4.4.3):受影响
6.openEuler-22.03-LTS-SP1(4.4.3):受影响
7.openEuler-22.03-LTS-SP2(4.4.3):受影响
8.openEuler-22.03-LTS-SP3(4.4.3):受影响
9.openEuler-24.03-LTS:受影响
10.openEuler-24.03-LTS-Next:受影响

修复是否涉及abi变化(是/否)：
1.master(4.4.3):
2.openEuler-20.03-LTS-SP1(4.4.2):
3.openEuler-20.03-LTS-SP4(4.4.2):
4.openEuler-22.03-LTS(4.4.2):
5.openEuler-22.03-LTS-Next(4.4.3):
6.openEuler-22.03-LTS-SP1(4.4.3):
7.openEuler-22.03-LTS-SP2(4.4.3):
8.openEuler-22.03-LTS-SP3(4.4.3):
9.openEuler-24.03-LTS:
10.openEuler-24.03-LTS-Next:

Hi openeuler-ci-bot, welcome to the openEuler Community.
I'm the Bot here serving you. You can find the instructions on how to interact with me at Here.
If you have any questions, please contact the SIG: Networking, and any of the maintainers: @seuzw , @luzhihao , @kircher , @gebidelidaye , @Apricity , @孙苏皖 , @robertxw

@seuzw ,@luzhihao ,@kircher ,@gebidelidaye ,@Apricity ,@孙苏皖 ,@robertxw
issue处理注意事项:
1. 当前issue受影响的分支提交pr时, 须在pr描述中填写当前issue编号进行关联, 否则无法关闭当前issue;
2. 模板内容需要填写完整, 无论是受影响或者不受影响都需要填写完整内容,未引入的分支不需要填写, 否则无法关闭当前issue;
3. 以下为模板中需要填写完整的内容, 请复制到评论区回复, 注: 内容的标题名称(影响性分析说明, openEuler评分, 受影响版本排查(受影响/不受影响), 修复是否涉及abi变化(是/否))不能省略,省略后cve-manager将无法正常解析填写内容.

影响性分析说明:

openEuler评分: (评分和向量)

受影响版本排查(受影响/不受影响):
1.master(4.4.3):
2.openEuler-20.03-LTS-SP1(4.4.2):
3.openEuler-20.03-LTS-SP4(4.4.2):
4.openEuler-22.03-LTS(4.4.2):
5.openEuler-22.03-LTS-Next(4.4.3):
6.openEuler-22.03-LTS-SP1(4.4.3):
7.openEuler-22.03-LTS-SP2(4.4.3):
8.openEuler-22.03-LTS-SP3(4.4.3):
9.openEuler-24.03-LTS:
10.openEuler-24.03-LTS-Next:

修复是否涉及abi变化(是/否)：
1.master(4.4.3):
2.openEuler-20.03-LTS-SP1(4.4.2):
3.openEuler-20.03-LTS-SP4(4.4.2):
4.openEuler-22.03-LTS(4.4.2):
5.openEuler-22.03-LTS-Next(4.4.3):
6.openEuler-22.03-LTS-SP1(4.4.3):
7.openEuler-22.03-LTS-SP2(4.4.3):
8.openEuler-22.03-LTS-SP3(4.4.3):
9.openEuler-24.03-LTS:
10.openEuler-24.03-LTS-Next:

issue处理具体操作请参考:
https://gitee.com/openeuler/cve-manager/blob/master/cve-vulner-manager/doc/md/manual.md
pr关联issue具体操作请参考:
https://gitee.com/help/articles/4142

参考网址	关联pr	状态	补丁链接
https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2024-3661
https://security-tracker.debian.org/tracker/CVE-2024-3661

说明：补丁链接仅供初步排查参考，实际可用性请人工再次确认，补丁下载验证可使用CVE补丁工具。
若补丁不准确，烦请在此issue下评论 '/report-patch 参考网址补丁链接1,补丁链接2' 反馈正确信息，便于我们不断优化工具，不胜感激。
如 /report-patch https://security-tracker.debian.org/tracker/CVE-2021-3997 https://github.com/systemd/systemd/commit/5b1cf7a9be37e20133c0208005274ce4a5b5c6a1

影响性分析说明:
按照设计，DHCP协议不对消息进行身份验证，包括诸如无类别静态路由选项（121）在内。具有发送DHCP消息能力的攻击者可以操纵路由以重定向VPN流量，从而允许攻击者读取、干扰或可能修改本应由VPN保护的网络流量。许多基于IP路由的VPN系统都容易受到此类攻击。
openEuler评分：
7.6
Vector：CVSS：3.0/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:L
受影响版本排查(受影响/不受影响)：
1.master(4.4.3):受影响
2.openEuler-20.03-LTS-SP1(4.4.2):受影响
3.openEuler-20.03-LTS-SP4(4.4.2):受影响
4.openEuler-22.03-LTS(4.4.2):受影响
5.openEuler-22.03-LTS-Next(4.4.3):受影响
6.openEuler-22.03-LTS-SP1(4.4.3):受影响
7.openEuler-22.03-LTS-SP2(4.4.3):受影响
8.openEuler-22.03-LTS-SP3(4.4.3):受影响
9.openEuler-24.03-LTS:受影响
10.openEuler-24.03-LTS-Next:受影响

@renmingshuai 5.修复是否涉及abi变化(是/否)=> 没有分析或未按正确格式填写:master:,openEuler-20.03-LTS-SP1:,openEuler-20.03-LTS-SP4:,openEuler-22.03-LTS:,openEuler-22.03-LTS-Next:,openEuler-22.03-LTS-SP1:,openEuler-22.03-LTS-SP2:,openEuler-22.03-LTS-SP3:,openEuler-24.03-LTS:,openEuler-24.03-LTS-Next:

该漏洞是DHCP协议（rfc2131#section-7和rfc3442#section-7）上的漏洞，社区暂无修复补丁。
规避方法：忽略 DHCP 服务器的选项 121
修改dhclient的配置文件文件（默认路径/etc/dhcp/dhclient.conf），添加以下行：
supersede option 121;
这行配置会让dhclient忽略dhcp服务器发送的option 121，可以避免收到此漏洞攻击。
规避方案影响：使dhclient客户端无法影响服务端的option 121, 导致该功能不可用。

@renmingshuai
issue变更为 [已挂起/已拒绝] 状态时，必须填写相关原因，现issue被重新打开
请按如下格式评论原因后，重新进行操作

/reason xxxxxx

/reason 该漏洞是DHCP协议（rfc2131#section-7和rfc3442#section-7）上的漏洞，社区暂无修复补丁。
规避方法：忽略 DHCP 服务器的选项 121
修改dhclient的配置文件文件（默认路径/etc/dhcp/dhclient.conf），添加以下行：
supersede option 121;
这行配置会让dhclient忽略dhcp服务器发送的option 121，可以避免收到此漏洞攻击。
规避方案影响：使dhclient客户端无法影响服务端的option 121, 导致该功能不可用。

issue状态	操作者	原因
已挂起	renmingshuai	该漏洞是DHCP协议（rfc2131#section-7和rfc3442#section-7）上的漏洞，社区暂无修复补丁。
规避方法：忽略 DHCP 服务器的选项 121
修改dhclient的配置文件文件（默认路径/etc/dhcp/dhclient.conf），添加以下行：
supersede option 121;
这行配置会让dhclient忽略dhcp服务器发送的option 121，可以避免收到此漏洞攻击。
规避方案影响：使dhclient客户端无法影响服务端的option 121, 导致该功能不可用。

src-openEuler / dhcp

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src-openEuler / dhcp .gitee-modal { width: 500px !important; }

内容风险标识

CVE-2024-3661

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src-openEuler / dhcp