リモートの Ubuntu 18.04 LTS ホストには、USN-4577-1のアドバイザリに記載された複数の脆弱性の影響を受けるパッケージがインストールされています。

  - リリース後に dccps_hc_tx_ccid オブジェクトがリスナーとして添付された DCCP ソケットを再利用するため、ローカルの攻撃者が悪用可能な Linux カーネルにメモリ解放後使用 (Use After Free) の脆弱性があります。Ubuntu Linux カーネル5.4.0-51.56、5.3.0-68.63、4.15.0-121.123、4.4.0-193.224、3.13.0.182.191および3.2.0-149.196で修正済み。
    (CVE-2020-16119)

  -Overlayfsは、overlayfsでファイルをコピーする際に、権限チェックを適切に実行せず、権限のないユーザーの名前空間が許可されているなどの場合、ユーザーの名前空間から悪用される可能性があります。権限のないユーザーが読み取り可能ではないファイルを、取り外し可能なデバイスのように、ユーザーがコントロールするマウントポイントにコピーすることが可能でした。これは、カーネルバージョン4.19で次が導入していました。コミットd1d04ef（ovl：
    スタックファイルops）。これはカーネルバージョン 5.8で次により修正されていました。コミット56230d9（ovl：ovl_path_open()で許可を確認する）、48bd024（ovl：readdirでマウンタークレジットに切り替える）および05acefb（ovl：実際のファイルを開く許可をチェックする）。さらに、コミット130fdbc（ovl：実際のディレクトリを開くための正しいフラグを渡す）および292f902（ovl：ovl_real_ioctl()でセキュリティフックを呼び出す）カーネル5.8でのセキュリティフックを呼び出すことも必要となる場合があります。これらの追加のコミットにより、ユーザー名前空間内のオーバーレイマウントで回帰が導入され、ユーザー名前空間外の所有権を持つファイルへのアクセスが阻止されました。この回帰は、その後のコミットb6650da（ovl：O_NOATIMEiのために失敗しない）によって、カーネル5.11で軽減されました。（CVE-2020-16120）

Nessus はこれらの問題をテストしておらず、代わりにアプリケーションが自己報告するバージョン番号にのみ依存していることに注意してください。

この更新では、SUSE Linux Enterprise 15-SP2コードストリームのRTカーネルを同期します。この更新はSUSEからインポートされました：SLE-15-SP2: 更新プロジェクトを更新します。

According to the versions of the kernel packages installed, the EulerOS Virtualization installation on the remote host is affected by the following vulnerabilities :

  - An issue was discovered in the Linux kernel through     5.11.3. A kernel pointer leak can be used to determine     the address of the iscsi_transport structure. When an     iSCSI transport is registered with the iSCSI subsystem,     the transport's handle is available to unprivileged     users via the sysfs file system, at     /sys/class/iscsi_transport/$TRANSPORT_NAME/handle. When     read, the show_transport_handle function (in     drivers/scsi/scsi_transport_iscsi.c) is called, which     leaks the handle. This handle is actually the pointer     to an iscsi_transport struct in the kernel module's     global variables.(CVE-2021-27363)

  - An issue was discovered in the Linux kernel through     5.11.3. Certain iSCSI data structures do not have     appropriate length constraints or checks, and can     exceed the PAGE_SIZE value. An unprivileged user can     send a Netlink message that is associated with iSCSI,     and has a length up to the maximum length of a Netlink     message.(CVE-2021-27365)

  - An issue was discovered in the Linux kernel through     5.11.3. drivers/scsi/scsi_transport_iscsi.c is     adversely affected by the ability of an unprivileged     user to craft Netlink messages.(CVE-2021-27364)

  - Overlayfs did not properly perform permission checking     when copying up files in an overlayfs and could be     exploited from within a user namespace, if, for     example, unprivileged user namespaces were allowed. It     was possible to have a file not readable by an     unprivileged user to be copied to a mountpoint     controlled by the user, like a removable device. This     was introduced in kernel version 4.19 by commit d1d04ef     ('ovl: stack file ops'). This was fixed in kernel     version 5.8 by commits 56230d9 ('ovl: verify     permissions in ovl_path_open()'), 48bd024 ('ovl: switch     to mounter creds in readdir') and 05acefb ('ovl: check     permission to open real file'). Additionally, commits     130fdbc ('ovl: pass correct flags for opening real     directory') and 292f902 ('ovl: call secutiry hook in     ovl_real_ioctl()') in kernel 5.8 might also be desired     or necessary. These additional commits introduced a     regression in overlay mounts within user namespaces     which prevented access to files with ownership outside     of the user namespace. This regression was mitigated by     subsequent commit b6650da ('ovl: do not fail because of     O_NOATIMEi') in kernel 5.11.(CVE-2020-16120)

  - A flaw was found in the Linux kernel's implementation     of string matching within a packet. A privileged user     (with root or CAP_NET_ADMIN) when inserting iptables     rules could insert a rule which can panic the     system.(CVE-2021-20177)

  - fs/nfsd/nfs3xdr.c in the Linux kernel through 5.10.8,     when there is an NFS export of a subdirectory of a     filesystem, allows remote attackers to traverse to     other parts of the filesystem via READDIRPLUS. NOTE:
    some parties argue that such a subdirectory export is     not intended to prevent this attack see also the     exports(5) no_subtree_check default     behavior.(CVE-2021-3178)

  - nbd_add_socket in drivers/block/nbd.c in the Linux     kernel through 5.10.12 has an ndb_queue_rq     use-after-free that could be triggered by local     attackers (with access to the nbd device) via an I/O     request at a certain point during device setup, aka     CID-b98e762e3d71.(CVE-2021-3348)

  - An issue was discovered in the Linux kernel through     5.10.11. PI futexes have a kernel stack use-after-free     during fault handling, allowing local users to execute     code in the kernel, aka     CID-34b1a1ce1458.(CVE-2021-3347)

  - A flaw was found in the Linux kernel. The marvell wifi     driver could allow a local attacker to execute     arbitrary code via a long SSID value in     mwifiex_cmd_802_11_ad_hoc_start function. The highest     threat from this vulnerability is to data     confidentiality and integrity as well as system     availability.(CVE-2020-36158)

  - A flaw was found in the Linux kernel's implementation     of the Linux SCSI target host, where an authenticated     attacker could write to any block on the exported SCSI     device backing store. This flaw allows an authenticated     attacker to send LIO block requests to the Linux system     to overwrite data on the backing store. The highest     threat from this vulnerability is to integrity. In     addition, this flaw affects the tcmu-runner package,     where the affected SCSI command is     called.(CVE-2020-28374)

Note that Tenable Network Security has extracted the preceding description block directly from the EulerOS security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

The remote Ubuntu 18.04 LTS host has a package installed that is affected by multiple vulnerabilities as referenced in the USN-4577-1 advisory.

  - Use-after-free vulnerability in the Linux kernel exploitable by a local attacker due to reuse of a DCCP     socket with an attached dccps_hc_tx_ccid object as a listener after being released. Fixed in Ubuntu Linux     kernel 5.4.0-51.56, 5.3.0-68.63, 4.15.0-121.123, 4.4.0-193.224, 3.13.0.182.191 and 3.2.0-149.196.
    (CVE-2020-16119)

  - Overlayfs did not properly perform permission checking when copying up files in an overlayfs and could be     exploited from within a user namespace, if, for example, unprivileged user namespaces were allowed. It was     possible to have a file not readable by an unprivileged user to be copied to a mountpoint controlled by     the user, like a removable device. This was introduced in kernel version 4.19 by commit d1d04ef (ovl:
    stack file ops). This was fixed in kernel version 5.8 by commits 56230d9 (ovl: verify permissions in     ovl_path_open()), 48bd024 (ovl: switch to mounter creds in readdir) and 05acefb (ovl: check permission     to open real file). Additionally, commits 130fdbc (ovl: pass correct flags for opening real directory)     and 292f902 (ovl: call secutiry hook in ovl_real_ioctl()) in kernel 5.8 might also be desired or     necessary. These additional commits introduced a regression in overlay mounts within user namespaces which     prevented access to files with ownership outside of the user namespace. This regression was mitigated by     subsequent commit b6650da (ovl: do not fail because of O_NOATIMEi) in kernel 5.11. (CVE-2020-16120)

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

An update of the linux package has been released.

The remote Oracle Linux 7 host has packages installed that are affected by multiple vulnerabilities as referenced in the ELSA-2021-9084 advisory.

  - Overlayfs did not properly perform permission checking when copying up files in an overlayfs and could be     exploited from within a user namespace, if, for example, unprivileged user namespaces were allowed. It was     possible to have a file not readable by an unprivileged user to be copied to a mountpoint controlled by     the user, like a removable device. This was introduced in kernel version 4.19 by commit d1d04ef (ovl:
    stack file ops). This was fixed in kernel version 5.8 by commits 56230d9 (ovl: verify permissions in     ovl_path_open()), 48bd024 (ovl: switch to mounter creds in readdir) and 05acefb (ovl: check permission     to open real file). Additionally, commits 130fdbc (ovl: pass correct flags for opening real directory)     and 292f902 (ovl: call secutiry hook in ovl_real_ioctl()) in kernel 5.8 might also be desired or     necessary. These additional commits introduced a regression in overlay mounts within user namespaces which     prevented access to files with ownership outside of the user namespace. This regression was mitigated by     subsequent commit b6650da (ovl: do not fail because of O_NOATIMEi) in kernel 5.11. (CVE-2020-16120)

  - An issue was discovered in the Linux kernel through 5.10.11. PI futexes have a kernel stack use-after-free     during fault handling, allowing local users to execute code in the kernel, aka CID-34b1a1ce1458.
    (CVE-2021-3347)

  - nbd_add_socket in drivers/block/nbd.c in the Linux kernel through 5.10.12 has an ndb_queue_rq use-after-     free that could be triggered by local attackers (with access to the nbd device) via an I/O request at a     certain point during device setup, aka CID-b98e762e3d71. (CVE-2021-3348)

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

The SUSE Linux Enterprise 12 SP5 kernel was updated to receive various security and bug fixes.

The following security bugs were fixed :

CVE-2020-25656: Fixed a concurrency use-after-free in vt_do_kdgkb_ioctl (bnc#1177766).

CVE-2020-25285: Fixed a race condition between hugetlb sysctl handlers in mm/hugetlb.c (bnc#1176485).

CVE-2020-0430: Fixed an OOB read in skb_headlen of /include/linux/skbuff.h (bnc#1176723).

CVE-2020-14351: Fixed a race in the perf_mmap_close() function (bsc#1177086).

CVE-2020-16120: Fixed a permissions issue in ovl_path_open() (bsc#1177470).

CVE-2020-8694: Restricted energy meter to root access (bsc#1170415).

CVE-2020-25705: A ICMP global rate limiting side-channel was removed which could lead to e.g. the SADDNS attack (bsc#1175721)

The update package also includes non-security fixes. See advisory for details.

Note that Tenable Network Security has extracted the preceding description block directly from the SUSE security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

This update syncs the RT kernel from the SUSE Linux Enterprise 15-SP2 codestream. This update was imported from the SUSE:SLE-15-SP2:Update update project.

ID	Name	Product	Family	Published	Updated	Severity
141449	Ubuntu 18.04 LTS : Linux カーネル脆弱性 (USN-4577-1)	Nessus	Ubuntu Local Security Checks	10/14/2020	1/9/2024	high
146282	openSUSEセキュリティ更新プログラム：RTカーネル（openSUSE-2021-242）	Nessus	SuSE Local Security Checks	2/8/2021	2/9/2023	critical
148634	EulerOS Virtualization 2.9.1 : kernel (EulerOS-SA-2021-1715)	Nessus	Huawei Local Security Checks	4/15/2021	1/4/2024	high
141449	Ubuntu 18.04 LTS : Linux kernel vulnerabilities (USN-4577-1)	Nessus	Ubuntu Local Security Checks	10/14/2020	1/9/2024	high
141496	Photon OS 3.0: Linux PHSA-2020-3.0-0153	Nessus	PhotonOS Local Security Checks	10/19/2020	2/19/2021	medium
142921	openSUSE Security Update : the Linux Kernel (openSUSE-2020-1901)	Nessus	SuSE Local Security Checks	11/17/2020	2/8/2024	high
147202	Oracle Linux 7 : Unbreakable Enterprise kernel (ELSA-2021-9084)	Nessus	Oracle Linux Local Security Checks	3/9/2021	1/16/2024	high
143858	SUSE SLES12 Security Update : kernel (SUSE-SU-2020:3326-1)	Nessus	SuSE Local Security Checks	12/9/2020	2/5/2024	high
146282	openSUSE Security Update : RT kernel (openSUSE-2021-242)	Nessus	SuSE Local Security Checks	2/8/2021	2/9/2023	critical

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