Bug 111240 - CAN-2003-0961 local privilege escalation via do_brk()
Summary: CAN-2003-0961 local privilege escalation via do_brk()
Keywords:
Status: CLOSED ERRATA
Alias: None
Product: Red Hat Enterprise Linux 2.1
Classification: Red Hat
Component: kernel
Version: 2.1
Hardware: All
OS: Linux
medium
medium
Target Milestone: ---
Assignee: Arjan van de Ven
QA Contact: Brian Brock
URL:
Whiteboard:
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2003-12-01 08:36 UTC by Mark J. Cox
Modified: 2007-11-30 22:06 UTC (History)
2 users (show)

Fixed In Version:
Doc Type: Bug Fix
Doc Text:
Clone Of:
Environment:
Last Closed: 2003-12-02 13:57:21 UTC
Target Upstream Version:
Embargoed:

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Links
System ID Private Priority Status Summary Last Updated
Red Hat Product Errata RHSA-2003:389 0 high SHIPPED_LIVE Important: kernel security update 2003-12-01 05:00:00 UTC

Description Mark J. Cox 2003-12-01 08:36:31 UTC 
A flaw in bounds checking in do_brk in the Linux kernel before 2.4.23
can allow a local user to gain root privileges.

The URL below gives the (2 line) patch that corrects this issue.

http://linux.bkbits.net:8080/linux-2.4/cset@marcelo@dmt.cyclades|ChangeSet|20031002082056|19757

Although the issue was commited on October 2nd 2003 it was not
believed to be exploitable for privilege escalation.  Working exploits
for this issue have been found in the wild.

Users of Red Hat Enterprise Linux 3 should upgrade to the kernel
packages provided by RHBA-2003:308 released on 30th October 2003 which
already contained a patch to correct this issue.
Comment 1 Mark J. Cox 2003-12-01 08:37:33 UTC 
Updated packages for RHEL 2.1 containing just the patch referenced
above are currently in QA.  This issue will be public on 1st Dec 2003.
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