From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 5CEA71802DF for ; Wed, 10 Apr 2024 19:02:28 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1712775748; cv=none; b=Z4NMoC00e7tN21GD9L5ci/isZUec5NDl7QKS6P5ABBXt04/lipOPiduL7M0c268A1fH5t6/okXeXiTZQN5cBiiwHyUyVa/ZezTRPLHRF0rd5oypYv7HH3LHwCsnWIWhtHOmXGeBq51aVFT1QUUSTjD5a2TQ6PoORu8sYg/A6Bb8= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1712775748; c=relaxed/simple; bh=ID2nPGGUOP0Qnw+Z7BAkS5MBqS9u3a0qdtcx+iy8Da8=; h=From:To:Cc:Subject:Date:Message-ID:MIME-Version; b=IzN7BgAcOLSRYICI4R+ZjxELpINMG1toezUScGE5a2AEdKU4oinXnhkOrb/sbbjTO3zM0cT3g0+wEKOahvTwVwHpTbX7DledLsjDejhSzrZXgHxL7Lg+uCvYnBGmRNpgwPvuv/pr2+Fa/q0i2rTsLUGDZexsQXHGEp6hS6kCIWI= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=ecPeCwrI; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="ecPeCwrI" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 898B4C433C7; Wed, 10 Apr 2024 19:02:27 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1712775747; bh=ID2nPGGUOP0Qnw+Z7BAkS5MBqS9u3a0qdtcx+iy8Da8=; h=From:To:Cc:Subject:Date:Reply-to:From; b=ecPeCwrImxOEvq1E1lAvSSkJL+0H2oWwGmuh2o7tRGxmRDxWHF0Sz2ethyLq5Lkz5 k/xDWkM4VTyXeyhqXMdTUfjCxZzB/ng/N5g7dj7x6A7fjEQEL9WgT28t6gScZ6FfuT 0obqoZ+zQzCdYEybDGofeynjsUmJP8I2l2jj9CpA= From: Greg Kroah-Hartman To: linux-cve-announce@vger.kernel.org Cc: Greg Kroah-Hartman Subject: CVE-2021-47213: NFSD: Fix exposure in nfsd4_decode_bitmap() Date: Wed, 10 Apr 2024 21:02:06 +0200 Message-ID: <2024041005-CVE-2021-47213-c84f@gregkh> X-Mailer: git-send-email 2.44.0 Precedence: bulk X-Mailing-List: linux-cve-announce@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Reply-to: , X-Developer-Signature: v=1; a=openpgp-sha256; l=2045; i=gregkh@linuxfoundation.org; h=from:subject:message-id; bh=ID2nPGGUOP0Qnw+Z7BAkS5MBqS9u3a0qdtcx+iy8Da8=; b=owGbwMvMwCRo6H6F97bub03G02pJDGlij3RnpOZuSlLkmLuokmtLatGSG19cUtas379XYs069 ofPQh/2dsSyMAgyMciKKbJ82cZzdH/FIUUvQ9vTMHNYmUCGMHBxCsBEHtQwzI9T4Jxx7oXcb66D /LvnH1wbJmIoz8cwz4D513+OkN/zWT83lMu2Xj1jdeFbCgA= X-Developer-Key: i=gregkh@linuxfoundation.org; a=openpgp; fpr=F4B60CC5BF78C2214A313DCB3147D40DDB2DFB29 Content-Transfer-Encoding: 8bit Description =========== In the Linux kernel, the following vulnerability has been resolved: NFSD: Fix exposure in nfsd4_decode_bitmap() rtm@csail.mit.edu reports: > nfsd4_decode_bitmap4() will write beyond bmval[bmlen-1] if the RPC > directs it to do so. This can cause nfsd4_decode_state_protect4_a() > to write client-supplied data beyond the end of > nfsd4_exchange_id.spo_must_allow[] when called by > nfsd4_decode_exchange_id(). Rewrite the loops so nfsd4_decode_bitmap() cannot iterate beyond @bmlen. Reported by: rtm@csail.mit.edu The Linux kernel CVE team has assigned CVE-2021-47213 to this issue. Affected and fixed versions =========================== Issue introduced in 5.11 with commit d1c263a031e8 and fixed in 5.15.5 with commit 10c22d9519f3 Issue introduced in 5.11 with commit d1c263a031e8 and fixed in 5.16 with commit c0019b7db1d7 Please see https://www.kernel.org for 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-2021-47213 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: fs/nfsd/nfs4xdr.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/10c22d9519f3f5939de61a1500aa3a926b778d3a https://git.kernel.org/stable/c/c0019b7db1d7ac62c711cda6b357a659d46428fe