CVE-2021-4209

一、漏洞信息
漏洞编号：CVE-2021-4209
漏洞归属组件：gnutls
漏洞归属的版本：3.6.14,3.6.15,3.7.2
CVSS V3.0分值：
BaseScore：6.5 Medium
Vector：CVSS：3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
漏洞简述：
A NULL pointer dereference flaw was found in GnuTLS. As Nettle s hash update functions internally call memcpy, providing zero-length input may cause undefined behavior. This flaw leads to a denial of service after authentication in rare circumstances.
漏洞公开时间：2022-08-25 00:15:00
漏洞创建时间：2022-08-25 15:36:36
漏洞详情参考链接：
https://nvd.nist.gov/vuln/detail/CVE-2021-4209

更多参考(点击展开)

参考来源	参考链接	来源链接
nvd	https://gitlab.com/gnutls/gnutls/-/issues/1306
nvd	https://access.redhat.com/security/cve/CVE-2021-4209
nvd	https://gitlab.com/gnutls/gnutls/-/merge_requests/1503
nvd	https://bugzilla.redhat.com/show_bug.cgi?id=2044156
nvd	https://gitlab.com/gnutls/gnutls/-/commit/3db352734472d851318944db13be73da61300568
nvd	https://security.netapp.com/advisory/ntap-20220915-0005/
redhat	https://access.redhat.com/security/cve/CVE-2021-4209
suse_bugzilla	https://bugzilla.redhat.com/show_bug.cgi?id=2044156	https://bugzilla.suse.com/show_bug.cgi?id=1196167
suse_bugzilla	http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2021-4209	https://bugzilla.suse.com/show_bug.cgi?id=1196167
redhat_bugzilla	https://gitlab.com/gnutls/gnutls/-/merge_requests/1503	https://bugzilla.redhat.com/show_bug.cgi?id=2044156
redhat_bugzilla	https://gitlab.com/gnutls/gnutls/-/commit/3db352734472d851318944db13be73da61300568	https://bugzilla.redhat.com/show_bug.cgi?id=2044156
ubuntu	https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-4209	https://ubuntu.com/security/CVE-2021-4209
ubuntu	https://access.redhat.com/security/cve/CVE-2021-4209	https://ubuntu.com/security/CVE-2021-4209
ubuntu	https://ubuntu.com/security/notices/USN-5550-1	https://ubuntu.com/security/CVE-2021-4209
ubuntu	https://ubuntu.com/security/notices/USN-5750-1	https://ubuntu.com/security/CVE-2021-4209
ubuntu	https://nvd.nist.gov/vuln/detail/CVE-2021-4209	https://ubuntu.com/security/CVE-2021-4209
ubuntu	https://launchpad.net/bugs/cve/CVE-2021-4209	https://ubuntu.com/security/CVE-2021-4209
ubuntu	https://security-tracker.debian.org/tracker/CVE-2021-4209	https://ubuntu.com/security/CVE-2021-4209
ubuntu	https://gitlab.com/gnutls/gnutls/-/issues/1306	https://ubuntu.com/security/CVE-2021-4209
debian		https://security-tracker.debian.org/tracker/CVE-2021-4209
cve_search		https://gitlab.com/gnutls/gnutls/-/issues/1306
cve_search		https://access.redhat.com/security/cve/CVE-2021-4209
cve_search		https://gitlab.com/gnutls/gnutls/-/merge_requests/1503
cve_search		https://bugzilla.redhat.com/show_bug.cgi?id=2044156
cve_search		https://gitlab.com/gnutls/gnutls/-/commit/3db352734472d851318944db13be73da61300568
suse_bugzilla	https://bugzilla.redhat.com/show_bug.cgi?id=2044156
suse_bugzilla	http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2021-4209
redhat_bugzilla	https://gitlab.com/gnutls/gnutls/-/merge_requests/1503
redhat_bugzilla	https://gitlab.com/gnutls/gnutls/-/commit/3db352734472d851318944db13be73da61300568
redhat_bugzilla	https://bugzilla.redhat.com/show_bug.cgi?id=2044156
ubuntu	https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-4209
ubuntu	https://access.redhat.com/security/cve/CVE-2021-4209
ubuntu	https://ubuntu.com/security/notices/USN-5550-1
ubuntu	https://nvd.nist.gov/vuln/detail/CVE-2021-4209
ubuntu	https://launchpad.net/bugs/cve/CVE-2021-4209
ubuntu	https://security-tracker.debian.org/tracker/CVE-2021-4209
ubuntu	https://gitlab.com/gnutls/gnutls/-/issues/1306
debian	https://security-tracker.debian.org/tracker/CVE-2021-4209
nvd	https://security.netapp.com/advisory/ntap-20220915-0005/
ubuntu	https://gitlab.com/gnutls/gnutls/-/commit/3db352734472d851318944db13be73da61300568
nvd	https://gitlab.com/gnutls/gnutls/-/issues/1306
nvd	https://access.redhat.com/security/cve/CVE-2021-4209
nvd	https://gitlab.com/gnutls/gnutls/-/merge_requests/1503
nvd	https://bugzilla.redhat.com/show_bug.cgi?id=2044156
nvd	https://gitlab.com/gnutls/gnutls/-/commit/3db352734472d851318944db13be73da61300568

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:
其它
漏洞补丁信息：

详情(点击展开)

影响的包	修复版本	修复补丁	问题引入补丁	来源
		https://gitlab.com/gnutls/gnutls/-/commit/3db352734472d851318944db13be73da61300568		nvd
		https://gitlab.com/gnutls/gnutls/-/merge_requests/1503		redhat_bugzilla
		https://gitlab.com/gnutls/gnutls/-/commit/3db352734472d851318944db13be73da61300568		redhat_bugzilla
		https://gitlab.com/gnutls/gnutls/-/commit/3db352734472d851318944db13be73da61300568		ubuntu

二、漏洞分析结构反馈
影响性分析说明：
在 GnuTLS 中发现了一个 NULL 指针取消引用缺陷。由于 Nettle 的哈希更新函数在内部调用 memcpy，提供零长度输入可能会导致未定义的行为。在极少数情况下，此缺陷会导致身份验证后拒绝服务。
openEuler评分：
6.5
Vector：CVSS：3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
受影响版本排查(受影响/不受影响)：
1.openEuler-20.03-LTS-SP1(3.6.14):受影响
2.openEuler-20.03-LTS-SP3(3.6.14):受影响
3.openEuler-22.03-LTS(3.7.2):受影响
4.openEuler-22.09(3.7.2):受影响

修复是否涉及abi变化(是/否)：
1.openEuler-20.03-LTS-SP1(3.6.14):否
2.openEuler-20.03-LTS-SP3(3.6.14):否
3.openEuler-22.03-LTS(3.7.2):否
4.openEuler-22.09(3.7.2):否

三、漏洞修复
安全公告链接：https://www.openeuler.org/zh/security/safety-bulletin/detail/?id=openEuler-SA-2022-1889

Hi ryuo, 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: sig-security-facility, and any of the maintainers: @gwei3 , @wucaijun , @zhujianwei001 , @robertosassu , @mailofzxf , @吃牛的蛙

@gwei3 ,@wucaijun ,@zhujianwei001 ,@robertosassu ,@mailofzxf ,@吃牛的蛙
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.openEuler-20.03-LTS-SP1(3.6.14):
2.openEuler-20.03-LTS-SP3(3.6.14):
3.openEuler-22.03-LTS(3.7.2):
4.openEuler-22.09:

修复是否涉及abi变化(是/否)：
1.openEuler-20.03-LTS-SP1(3.6.14):
2.openEuler-20.03-LTS-SP3(3.6.14):
3.openEuler-22.03-LTS(3.7.2):
4.openEuler-22.09:

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-2021-4209	None	None	https://gitlab.com/gnutls/gnutls/-/commit/3db352734472d851318944db13be73da61300568
https://security-tracker.debian.org/tracker/CVE-2021-4209	None	None	https://gitlab.com/gnutls/gnutls/-/commit/3db352734472d851318944db13be73da61300568
https://ubuntu.com/security/CVE-2021-4209	None	None	https://gitlab.com/gnutls/gnutls/-/commit/3db352734472d851318944db13be73da61300568
http://www.cnnvd.org.cn/web/vulnerability/queryLds.tag?qcvCnnvdid=CVE-2021-4209

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

@wangxiaoya CVE信息从NVD同步成功, 稍后请重新加载页面.

@markeryang 请确认分支: openEuler-20.03-LTS-SP1,openEuler-20.03-LTS-SP3,openEuler-22.03-LTS,openEuler-22.09 受影响/不受影响.
请确认分支信息是否填写完整,否则将无法关闭当前issue.

影响性分析说明:
在 GnuTLS 中发现了一个 NULL 指针取消引用缺陷。由于 Nettle 的哈希更新函数在内部调用 memcpy，提供零长度输入可能会导致未定义的行为。在极少数情况下，此缺陷会导致身份验证后拒绝服务。
openEuler评分: (评分和向量)
6.5
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
受影响版本排查(受影响/不受影响):
1.openEuler-20.03-LTS-SP1(3.6.14):受影响
2.openEuler-20.03-LTS-SP3(3.6.14):受影响
3.openEuler-22.03-LTS(3.7.2):受影响
4.openEuler-22.09:受影响

修复是否涉及abi变化(是/否)：否
1.openEuler-20.03-LTS-SP1(3.6.14):否
2.openEuler-20.03-LTS-SP3(3.6.14):否
3.openEuler-22.03-LTS(3.7.2):否
4.openEuler-22.09:否

@markeryang 经过 cve-manager 解析, 已分析的内容如下表所示:

状态	需分析	内容
已分析	1.影响性分析说明	在 GnuTLS 中发现了一个 NULL 指针取消引用缺陷。由于 Nettle 的哈希更新函数在内部调用 memcpy，提供零长度输入可能会导致未定义的行为。在极少数情况下，此缺陷会导致身份验证后拒绝服务。
已分析	2.openEulerScore	6.5
已分析	2.openEulerVector	AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
已分析	3.受影响版本排查	openEuler-20.03-LTS-SP1:受影响,openEuler-20.03-LTS-SP3:受影响,openEuler-22.03-LTS:受影响,openEuler-22.09:受影响
已分析	4.修复是否涉及abi变化	openEuler-20.03-LTS-SP1:否,openEuler-20.03-LTS-SP3:否,openEuler-22.03-LTS:否,openEuler-22.09:否

请确认分析内容的准确性, 确认无误后, 您可以进行后续步骤, 否则您可以继续分析.

@zhujianwei001 ,@mailofzxf ,@robertosassu ,@gwei3 ,@wucaijun ,@openeuler-sync-bot
关闭issue前,需要将受影响的分支在合并pr时关联上当前issue编号: #I5O3BO:CVE-2021-4209
受影响分支: openEuler-20.03-LTS-SP3
具体操作参考: https://gitee.com/help/articles/4142

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