Oracle Linux 5 / 6 : Unbreakable Enterprise kernel (ELSA-2011-2029)

This script is Copyright (C) 2013 Tenable Network Security, Inc.


Synopsis :

The remote Oracle Linux host is missing one or more security updates.

Description :

Description of changes:

* CVE-2011-2898: Information leak in packet subsystem

Uninitialized struct padding in the packet subsystem led to an
information leak of two bytes of kernel memory to userspace.


* CVE-2011-2723: Remote denial of service vulnerability in gro.

The skb_gro_header_slow function in the Linux kernel had a bug which
allowed a remote attacker to put certain gro fields in an inconsistent
state, resulting in a denial of service.


* CVE-2011-2496: Local denial of service in mremap().

Robert Swiecki discovered that mremap() could be abused for local denial of
service by triggering a BUG_ON assert.


* CVE-2011-2484: Denial of service in taskstats subsystem.

The add_del_listener function in kernel/taskstats.c in the Linux kernel
did not prevent multiple registrations of exit handlers, which allowed
local users to cause a denial of service (memory and CPU consumption),
and bypass the OOM Killer, via a crafted application.

* CVE-2011-1833: Information disclosure in eCryptfs.

Vasiliy Kulikov of Openwall and Dan Rosenberg discovered that eCryptfs
incorrectly validated permissions on the requested source directory. A
local attacker could use this flaw to mount an arbitrary directory,
possibly leading to information disclosure.


kernel-uek:

[2.6.32-200.20.1.el5uek]
- af_packet: prevent information leak {CVE-2011-2898}
- gro: Only reset frag0 when skb can be pulled {CVE-2011-2723}
- vm: fix vm_pgoff wrap in stack expansion {CVE-2011-2496}
- vm: fix vm_pgoff wrap in upward expansion {CVE-2011-2496}
- taskstats: don't allow duplicate entries in listener mode {CVE-2011-2484}
- Ecryptfs: Add mount option to check uid of device being mounted
{CVE-2011-1833}

ofa:

[1.5.1-4.0.53]
- Don't test rds_ib_ring_empty or ring_log without proper locks held

[1.5.1-4.0.52]
- Don't use RCU on the bind hash table to avoid close delays

[1.5.1-4.0.50]
- Fix crashes when rdma_resolve_route fails

[1.5.1-4.0.49]
- Add EL5.6 build support.

[1.5.1-4.0.48]
- RDS: Fix deadlock on congestion updates
- RDS: Fix memory use-after-free on RDS sockets

[1.5.1-4.0.47]
- RDS: disable the arp verify patch

[1.5.1-4.0.46]
- RDS: Destory the rdma id later in connection reset to avoid use after free

[1.5.1-4.0.45]
- RDS: sock close hang on RDS_MSG_MAPPED
- RDS: sk_alloc use GFP_KERNEL
- RDS: bad addr crash

[1.5.1-4.0.44]
- RDS: RDS_MSG_MAPPED race
- RDS: completion shutdown race
- RDS: sock rca hashtable race

[1.5.1-4.0.43]
- RDS: don't resched recv refill unless we've done at least 128 buffers

[1.5.1-4.0.42]
- RDS: resched recv refill as needed (Chris Mason)
- RDS: add rds-specific sock destruct function

[1.5.1-4.0.41]
- IPOIB: work around a possible lost interrupt (Eli
Cohen<<A HREF='http://oss.oracle.com/mailman/listinfo/el-errata'>eli at mallanox.co.il</A>>)

[1.5.1-4.0.40]
- RDS: Make sure rds_send_xmit catches pending congestion updates


[1.5.1-4.0.39]
- RDS: don't leak rdma ids that are new

[1.5.1-4.0.38]
- RDS: deal with ENOMEM in rds_ib_recv_refill

[1.5.1-4.0.37]
- RDS: don't destroy the rdma id on half formed connections

[1.5.1-4.0.36]
- RDS: don't trust the LL_SEND_FULL bit

[1.5.1-4.0.35]
- RDS: give up on half formed connections after 15s

[1.5.1-4.0.34]
- Bring back the LL_SEND_FULL bit, otherwise we don't make progress
on the send queue once the ring empties

[1.5.1-4.0.33]
- Don't schedule inside rds_send_xmit, it is called with locks held

[1.5.1-4.0.32]
- Replace mismatched arp fix with more effective one
- Don't set the LL_SEND_FULL bit when the send ring is full

[1.5.1-4.0.31]
- Fix mismatched arp entries during connection reset
- Fix softlockups in rds_send_xmit

[1.5.1-4.0.29]
- Add fix for enodev errors from sendmsg during resets

See also :

https://oss.oracle.com/pipermail/el-errata/2011-October/002394.html
https://oss.oracle.com/pipermail/el-errata/2011-October/002395.html

Solution :

Update the affected unbreakable enterprise kernel packages.

Risk factor :

Medium / CVSS Base Score : 5.7
(CVSS2#AV:A/AC:M/Au:N/C:N/I:N/A:C)

Family: Oracle Linux Local Security Checks

Nessus Plugin ID: 68422 ()

Bugtraq ID:

CVE ID: CVE-2011-1833
CVE-2011-2484
CVE-2011-2496
CVE-2011-2723
CVE-2011-2898