CVE-2010-2960: Null Pointer Dereference
First published: Thu Aug 26 2010(Updated: )
Description of problem: Reported by Taviso Ormandy via the Ubuntu Security Team. $ gcc keyctl.c -o keyctl -lkeyutils $ ./keyctl [ 213.999221] BUG: unable to handle kernel NULL pointer dereference at 00000034 [ 214.002770] IP: [<c02f0f2a>] keyctl_session_to_parent+0x12a/0x1c0 [ 214.006011] *pde = 0fdb0067 *pte = 00000000 [ 214.008007] Oops: 0000 [#1] SMP [ 214.008973] last sysfs file: /sys/module/ppdev/initstate [ 214.010466] Modules linked in: binfmt_misc vmblock vsock vmmemctl vmhgfs acpiphp snd_ens1371 gameport snd_ac97_codec ac97_bus snd_pcm_oss snd_mixer_oss snd_pcm snd_seq_dummy snd_seq_oss snd_seq_midi snd_rawmidi snd_seq_midi_event snd_seq snd_timer snd_seq_device ppdev fbcon tileblit font bitblit softcursor snd psmouse serio_raw parport_pc soundcore snd_page_alloc vmci shpchp i2c_piix4 vga16fb vgastate intel_agp agpgart lp parport mptspi mptscsih mptbase floppy scsi_transport_spi vmxnet [ 214.024416] [ 214.024899] Pid: 1772, comm: a.out Not tainted (2.6.32-24-generic #41-Ubuntu) VMware Virtual Platform [ 214.027413] EIP: 0060:[<c02f0f2a>] EFLAGS: 00210046 CPU: 0 [ 214.028927] EIP is at keyctl_session_to_parent+0x12a/0x1c0 [ 214.030419] EAX: d2cde100 EBX: d2cdeb00 ECX: 000003e8 EDX: cfcfc480 [ 214.032132] ESI: cfddb300 EDI: 00000000 EBP: d2c33f94 ESP: d2c33f7c [ 214.033811] DS: 007b ES: 007b FS: 00d8 GS: 00e0 SS: 0068 [ 214.035292] Process a.out (pid: 1772, ti=d2c32000 task=d79bbfc0 task.ti=d2c32000) [ 214.037346] Stack: [ 214.037926] 00000000 000003e8 d2cde700 004370c0 00000012 08048520 d2c33fac c02f22e5 [ 214.040262] <0> 00000004 00000012 00327ff4 08048520 d2c32000 c01033ec 00000012 004370c0 [ 214.042795] <0> 0804852b 00327ff4 08048520 00000001 00000120 0000007b 0000007b 00000000 [ 214.045405] Call Trace: [ 214.046108] [<c02f22e5>] ? sys_keyctl+0x65/0x170 [ 214.047434] [<c01033ec>] ? syscall_call+0x7/0xb [ 214.048711] Code: 90 0f 85 77 ff ff ff 8b 7a 08 89 7d ec 3b 78 18 0f 85 68 ff ff ff 3b 7a 18 0f 85 5f ff ff ff 3b 7a 10 0f 85 56 ff ff ff 8b 7d e8 <3b> 4f 34 8d 76 00 0f 85 47 ff ff ff 8b 7d f0 3b 4f 34 0f 85 3b [ 214.056401] EIP: [<c02f0f2a>] keyctl_session_to_parent+0x12a/0x1c0 SS:ESP 0068:d2c33f7c [ 214.058676] CR2: 0000000000000034 [ 214.059605] ---[ end trace cc41d96061101854 ]---
Credit: security@ubuntu.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| debian/linux-2.6 | ||
| Linux Kernel | <2.6.35.4 | |
| Ubuntu Linux | =6.06 | |
| Ubuntu Linux | =8.04 | |
| Ubuntu Linux | =9.04 | |
| Ubuntu Linux | =9.10 | |
| Ubuntu Linux | =10.04 | |
| Ubuntu Linux | =10.10 | |
| SUSE Linux Enterprise Desktop | =11-sp1 | |
| SUSE Linux Enterprise Server | =11-sp1 | |
| Ubuntu | =6.06 | |
| Ubuntu | =8.04 | |
| Ubuntu | =9.04 | |
| Ubuntu | =9.10 | |
| Ubuntu | =10.04 | |
| Ubuntu | =10.10 |
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Reference Links
- http://www.openwall.com/lists/oss-security/2010/09/02/1
- http://twitter.com/taviso/statuses/22777866582
- https://bugzilla.redhat.com/show_bug.cgi?id=627440
- http://www.securityfocus.com/bid/42932
- http://securitytracker.com/id?1024384
- http://secunia.com/advisories/41263
- http://lists.opensuse.org/opensuse-security-announce/2010-10/msg00003.html
- http://www.ubuntu.com/usn/USN-1000-1
- http://lists.opensuse.org/opensuse-security-announce/2011-02/msg00000.html
- http://www.vupen.com/english/advisories/2011/0298
- https://exchange.xforce.ibmcloud.com/vulnerabilities/61557
- https://launchpad.net/bugs/cve/CVE-2010-2960
- https://bugzilla.redhat.com/show_bug.cgi/attachment.cgi?id=441164&action=diff
- https://bugzilla.redhat.com/show_bug.cgi/attachment.cgi?id=441164&action=edit
- https://bugzilla.redhat.com/show_bug.cgi/attachment.cgi?id=441165&action=diff
- https://bugzilla.redhat.com/show_bug.cgi/attachment.cgi?id=441165&action=edit
- http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commitdiff_plain;h=9d1ac65a9698513d00e5608d93fca0c53f536c14
- http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commitdiff_plain;h=3d96406c7da1ed5811ea52a3b0905f4f0e295376
- https://security-tracker.debian.org/tracker/CVE-2010-2960
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2010-2960
- https://nvd.nist.gov/vuln/detail/CVE-2010-2960
- https://ubuntu.com/security/CVE-2010-2960
Frequently Asked Questions
What is the severity of CVE-2010-2960?
CVE-2010-2960 has a severity rating of high due to the risk of a kernel NULL pointer dereference leading to a system crash.
How do I fix CVE-2010-2960?
To fix CVE-2010-2960, you should update your Linux kernel to a version that addresses this vulnerability.
Which systems are affected by CVE-2010-2960?
CVE-2010-2960 affects various versions of the Linux kernel and Ubuntu Linux including versions up to 2.6.35.4.
What is the potential impact of exploiting CVE-2010-2960?
Exploiting CVE-2010-2960 may lead to a denial of service by causing the kernel to panic and crash.
Is there a workaround for CVE-2010-2960?
Currently, there are no known workarounds for CVE-2010-2960 other than applying the necessary updates.
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