- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - Gentoo Linux Security Advisory GLSA 201701-31 - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - https://security.gentoo.org/ - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - Severity: Normal Title: flex: Potential insecure code generation Date: January 11, 2017 Bugs: #589820 ID: 201701-31 - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - Synopsis ======== Flex might generate code with a buffer overflow making applications using such scanners vulnerable to the execution of arbitrary code. Background ========== flex is a programming tool used to generate scanners (programs which recognize lexical patterns in text). Affected packages ================= ------------------------------------------------------------------- Package / Vulnerable / Unaffected ------------------------------------------------------------------- 1 sys-devel/flex < 2.6.1 >= 2.6.1 Description =========== A heap-based buffer overflow in the yy_get_next_buffer function in Flex might allow context-dependent attackers to cause a denial of service or possibly execute arbitrary code via vectors involving num_to_read. Impact ====== Context-dependent attackers could cause a Denial of Service condition or possibly execute arbitrary code with the privileges of the process. Workaround ========== There is no known workaround at this time. Resolution ========== All flex users should upgrade to the latest version: # emerge --sync # emerge --ask --oneshot --verbose ">=sys-devel/flex-2.6.1" Packages which depend on flex may need to be recompiled. Tools such as qdepends (included in app-portage/portage-utils) may assist in identifying these packages: # emerge -1 -a -v $(qdepends -CQ sys-devel/flex | sed 's/^/=/') References ========== [ 1 ] CVE-2016-6354 http://nvd.nist.gov/nvd.cfm?cvename=CVE-2016-6354 Availability ============ This GLSA and any updates to it are available for viewing at the Gentoo Security Website: https://security.gentoo.org/glsa/201701-31 Concerns? ========= Security is a primary focus of Gentoo Linux and ensuring the confidentiality and security of our users' machines is of utmost importance to us. Any security concerns should be addressed to security@gentoo.org or alternatively, you may file a bug at https://bugs.gentoo.org. License ======= Copyright 2017 Gentoo Foundation, Inc; referenced text belongs to its owner(s). The contents of this document are licensed under the Creative Commons - Attribution / Share Alike license. http://creativecommons.org/licenses/by-sa/2.5