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Message-ID: <2024030254-CVE-2023-52527-a1e8@gregkh> Date: Sat, 2 Mar 2024 22:53:11 +0100 From: Greg Kroah-Hartman <gregkh@...uxfoundation.org> To: linux-cve-announce@...r.kernel.org Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org> Subject: CVE-2023-52527: ipv4, ipv6: Fix handling of transhdrlen in __ip{,6}_append_data() Description =========== In the Linux kernel, the following vulnerability has been resolved: ipv4, ipv6: Fix handling of transhdrlen in __ip{,6}_append_data() Including the transhdrlen in length is a problem when the packet is partially filled (e.g. something like send(MSG_MORE) happened previously) when appending to an IPv4 or IPv6 packet as we don't want to repeat the transport header or account for it twice. This can happen under some circumstances, such as splicing into an L2TP socket. The symptom observed is a warning in __ip6_append_data(): WARNING: CPU: 1 PID: 5042 at net/ipv6/ip6_output.c:1800 __ip6_append_data.isra.0+0x1be8/0x47f0 net/ipv6/ip6_output.c:1800 that occurs when MSG_SPLICE_PAGES is used to append more data to an already partially occupied skbuff. The warning occurs when 'copy' is larger than the amount of data in the message iterator. This is because the requested length includes the transport header length when it shouldn't. This can be triggered by, for example: sfd = socket(AF_INET6, SOCK_DGRAM, IPPROTO_L2TP); bind(sfd, ...); // ::1 connect(sfd, ...); // ::1 port 7 send(sfd, buffer, 4100, MSG_MORE); sendfile(sfd, dfd, NULL, 1024); Fix this by only adding transhdrlen into the length if the write queue is empty in l2tp_ip6_sendmsg(), analogously to how UDP does things. l2tp_ip_sendmsg() looks like it won't suffer from this problem as it builds the UDP packet itself. The Linux kernel CVE team has assigned CVE-2023-52527 to this issue. Affected and fixed versions =========================== Issue introduced in 3.5 with commit a32e0eec7042 and fixed in 4.14.327 with commit 7626b9fed530 Issue introduced in 3.5 with commit a32e0eec7042 and fixed in 4.19.296 with commit 559d697c5d07 Issue introduced in 3.5 with commit a32e0eec7042 and fixed in 5.4.258 with commit 1fc793d68d50 Issue introduced in 3.5 with commit a32e0eec7042 and fixed in 5.10.198 with commit 96b2e1090397 Issue introduced in 3.5 with commit a32e0eec7042 and fixed in 5.15.135 with commit cd1189956393 Issue introduced in 3.5 with commit a32e0eec7042 and fixed in 6.1.57 with commit f6a7182179c0 Issue introduced in 3.5 with commit a32e0eec7042 and fixed in 6.5.7 with commit fe80658c08e3 Issue introduced in 3.5 with commit a32e0eec7042 and fixed in 6.6 with commit 9d4c75800f61 Please see https://www.kernel.org or a full list of currently supported kernel versions by the kernel community. Unaffected versions might change over time as fixes are backported to older supported kernel versions. The official CVE entry at https://cve.org/CVERecord/?id=CVE-2023-52527 will be updated if fixes are backported, please check that for the most up to date information about this issue. Affected files ============== The file(s) affected by this issue are: net/l2tp/l2tp_ip6.c Mitigation ========== The Linux kernel CVE team recommends that you update to the latest stable kernel version for this, and many other bugfixes. Individual changes are never tested alone, but rather are part of a larger kernel release. Cherry-picking individual commits is not recommended or supported by the Linux kernel community at all. If however, updating to the latest release is impossible, the individual changes to resolve this issue can be found at these commits: https://git.kernel.org/stable/c/7626b9fed53092aa2147978070e610ecb61af844 https://git.kernel.org/stable/c/559d697c5d072593d22b3e0bd8b8081108aeaf59 https://git.kernel.org/stable/c/1fc793d68d50dee4782ef2e808913d5dd880bcc6 https://git.kernel.org/stable/c/96b2e1090397217839fcd6c9b6d8f5d439e705ed https://git.kernel.org/stable/c/cd1189956393bf850b2e275e37411855d3bd86bb https://git.kernel.org/stable/c/f6a7182179c0ed788e3755ee2ed18c888ddcc33f https://git.kernel.org/stable/c/fe80658c08e3001c80c5533cd41abfbb0e0e28fd https://git.kernel.org/stable/c/9d4c75800f61e5d75c1659ba201b6c0c7ead3070
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