Bug 459226 (CVE-2008-3276)

Summary: CVE-2008-3276 Linux kernel dccp_setsockopt_change() integer overflow
Product: [Other] Security Response Reporter: Eugene Teo (Security Response) <eteo>
Component: vulnerabilityAssignee: Red Hat Product Security <security-response-team>
Status: CLOSED ERRATA QA Contact:
Severity: low Docs Contact:
Priority: low    
Version: unspecifiedCC: davids, dhoward, jpirko, jrusnack, lgoncalv, lwang, williams
Target Milestone: ---Keywords: Security
Target Release: ---   
Hardware: All   
OS: Linux   
Whiteboard:
Fixed In Version: Doc Type: Bug Fix
Doc Text:
Story Points: ---
Clone Of: Environment:
Last Closed: 2010-12-23 21:48:29 UTC Type: ---
Regression: --- Mount Type: ---
Documentation: --- CRM:
Verified Versions: Category: ---
oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
Embargoed:
Bug Depends On: 459231, 459232, 459235    
Bug Blocks:    
Attachments:
Description Flags
Upstream patch for this issue
none
Proposed backported patch for MRG kernel none

Description Eugene Teo (Security Response) 2008-08-15 07:35:02 UTC 
Description of problem:
Eugene Teo reported that an integer overflow flaw was found in the Linux kernel dccp_setsockopt_change() function. The vulnerability exists due to a lack of sanitisation performed on a user-controlled integer value before the value is employed as the size argument of a memory allocation operation. An attacker may leverage this vulnerability to trigger a kernel panic on a victim's machine remotely.
Comment 1 Eugene Teo (Security Response) 2008-08-15 07:36:56 UTC 
Proposed upstream patch:
http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commitdiff;h=3e8a0a559c66ee9e7468195691a56fefc3589740
Comment 2 Eugene Teo (Security Response) 2008-08-15 07:47:00 UTC 
Created attachment 314378 [details]
Upstream patch for this issue
Comment 7 Eugene Teo (Security Response) 2008-08-20 04:07:07 UTC 
Created attachment 314606 [details]
Proposed backported patch for MRG kernel
Comment 9 Eugene Teo (Security Response) 2008-08-20 05:50:27 UTC 
On Red Hat Enterprise Linux 5, SELinux denies access requested by default:

type=AVC msg=audit(1217928226.398:41): avc:  denied  { create } for pid=4974 comm="server" scontext=user_u:system_r:unconfined_t:s0 tcontext=user_u:system_r:unconfined_t:s0 tclass=dccp_socket type=SYSCALL msg=audit(1217928226.398:41): arch=c000003e syscall=41 success=no exit=-13 a0=2 a1=6 a2=21 a3=0 items=0 ppid=3599 pid=4974 auid=500 uid=500 gid=500 euid=500 suid=500 fsuid=500 egid=500 sgid=500 fsgid=500 tty=pts0 ses=1 comm="server" exe="/home/test/dccp-CVE-2008-3276/server" subj=user_u:system_r:unconfined_t:s0 key=(null)

socket(PF_INET, 0x6 /* SOCK_??? */, 0x21 /* IPPROTO_??? */) = -1 EACCES (Permission denied)
Comment 10 Luis Claudio R. Goncalves 2008-08-21 18:20:52 UTC 
Patch queued for -78
Comment 11 David Sommerseth 2008-09-30 16:56:58 UTC 
Verified.  Found both proposed and backported patch as mrg-rt.git commit 3e1ad8433fc1b6ca4eafd4b8b349ea88ef135fd2.

Disabled SELinux and run reproducer on 2.6.24.7-74rt and 2.6.24.7-81rt kernels.  Kernel crashed on -74rt and gave "setsockopt: Invalid argument" as error on -81rt.
Comment 15 Vincent Danen 2010-12-23 21:48:29 UTC 
This was addressed via:

MRG Realtime for RHEL 5 Server (RHSA-2008:0857)
Red Hat Enterprise Linux version 5 (RHSA-2008:0957)