From d5dfad4326fc683c813df1e37bbf5cf920591c8e Mon Sep 17 00:00:00 2001 From: Marcin Kościelnicki Date: Thu, 21 Nov 2019 00:20:15 +0100 Subject: rtld: Check __libc_enable_secure before honoring LD_PREFER_MAP_32BIT_EXEC (CVE-2019-19126) [BZ #25204] The problem was introduced in glibc 2.23, in commit b9eb92ab05204df772eb4929eccd018637c9f3e9 ("Add Prefer_MAP_32BIT_EXEC to map executable pages with MAP_32BIT"). --- NEWS | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-) (limited to 'NEWS') diff --git a/NEWS b/NEWS index 50479f17c9..df03f4dc48 100644 --- a/NEWS +++ b/NEWS @@ -86,7 +86,11 @@ Changes to build and runtime requirements: Security related changes: - [Add security related changes here] + CVE-2019-19126: ld.so failed to ignore the LD_PREFER_MAP_32BIT_EXEC + environment variable during program execution after a security + transition, allowing local attackers to restrict the possible mapping + addresses for loaded libraries and thus bypass ASLR for a setuid + program. Reported by Marcin Kościelnicki. The following bugs are resolved with this release: -- cgit 1.4.1