Bug 760984 (CVE-2011-4578) - CVE-2011-4578 acpid: Unsafe umask for actions executed by acpid
Summary: CVE-2011-4578 acpid: Unsafe umask for actions executed by acpid
Alias: CVE-2011-4578
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
Target Milestone: ---
Assignee: Red Hat Product Security
QA Contact:
Depends On:
Blocks: 761099
TreeView+ depends on / blocked
Reported: 2011-12-07 14:26 UTC by Jan Lieskovsky
Modified: 2021-06-11 21:04 UTC (History)
2 users (show)

Fixed In Version:
Doc Type: Bug Fix
Doc Text:
Clone Of:
Last Closed: 2021-06-11 21:04:29 UTC

Attachments (Terms of Use)

Description Jan Lieskovsky 2011-12-07 14:26:36 UTC
An unsafe umask (user file-creation mode mask) mode flaw was found in the way ACPI daemon event handler performed actions execution. A local attacker could use this flaw to read or alter files, created by and belonging to particular acpid action, during its execution.

[1] http://www.tedfelix.com/linux/acpid-netlink.html
[2] http://www.openwall.com/lists/oss-security/2011/12/06/2
    (CVE request)
[3] http://www.openwall.com/lists/oss-security/2011/12/06/3
    (CVE assignment)

Comment 1 Jan Lieskovsky 2011-12-07 14:29:59 UTC
This issue affects the versions of the acpid package, as shipped with Red Hat Enterprise Linux 4, 5, and 6.


This issue did NOT affect the versions of the acpid package, as shipped with Fedora release of 15 and 16. The acpid package version in those releases have been updated to upstream acpid-2.0.13 version.

Comment 2 Jan Lieskovsky 2011-12-07 14:31:14 UTC
Relevant upstream patch (related difference between v2.0.10 and v2.0.11 tarballs):

diff -uprs acpid-2.0.10/event.c acpid-2.0.11/event.c
--- acpid-2.0.10/event.c	2011-03-12 17:18:09.000000000 +0100
+++ acpid-2.0.11/event.c	2011-06-23 18:35:19.000000000 +0200
@@ -641,6 +641,7 @@ do_cmd_rule(struct rule *rule, const cha
 		if (acpid_debug && logevents) {
 			fprintf(stdout, "BEGIN HANDLER MESSAGES\n");
+		umask(0077);
 		execl("/bin/sh", "/bin/sh", "-c", action, NULL);
 		/* should not get here */
 		acpid_log(LOG_ERR, "execl(): %s", strerror(errno));

Comment 5 Product Security DevOps Team 2021-06-11 21:04:29 UTC
This bug is now closed. Further updates for individual products will be reflected on the CVE page(s):


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