Linux Kernel eCryptfs Null指针引用本地拒绝服务漏洞

2009-10-0900:00:00

Root

www.seebug.org

0.0004 Low

EPSS

Percentile

8.6%

JSON

Bugraq ID: 36639
CVE ID：CVE-2009-2908

Linux是一款开放源代码的操作系统。
Linux 'eCryptfs’组件存在漏洞，本地攻击者可以利用漏洞破坏内存进行拒绝服务攻击。
在低dentry调用vfs_unlink()时，当d_count为1，d_delete()会把dentry变为负的dentry。这可导致当 read()或write()完成时引用Null指针及在ecryptfs_read_update_atime()或 ecryptfs_getxattr()中引用负的dentry的d_inode。
在eCryptfs挂接点放置mutt的tmpdir可触发oops，可通过如下序列重现：
open("/tmp/upper/foo", O_RDWR|O_CREAT|O_EXCL|O_NOFOLLOW, 0600) = 3
link("/tmp/upper/foo", "/tmp/upper/bar") = 0
unlink("/tmp/upper/foo") = 0
open("/tmp/upper/bar", O_RDWR|O_CREAT|O_NOFOLLOW, 0600) = 4
unlink("/tmp/upper/bar") = 0
write(4, "eCryptfs test\n"…, 14 <unfinished …>
+++ killed by SIGKILL +++

Linux kernel 2.6.31 -rc7
Linux kernel 2.6.31 -rc6
Linux kernel 2.6.31 -rc3

Trustix Secure Enterprise Linux 2.0
Trustix Secure Linux 2.2
Trustix Secure Linux 2.1
Trustix Secure Linux 2.0
Linux kernel 2.6.31 -rc1
Linux kernel 2.6.31
Linux kernel 2.6.30 rc6
Linux kernel 2.6.30 1
Linux kernel 2.6.30 -rc5
Linux kernel 2.6.30 -rc3
Linux kernel 2.6.30 -rc2
Linux kernel 2.6.30 -rc1
Linux kernel 2.6.30
Linux kernel 2.6.29 4
Linux kernel 2.6.29 1
Linux kernel 2.6.29 -git8
Linux kernel 2.6.29 -git14
Linux kernel 2.6.29 -git1
Linux kernel 2.6.29
Linux kernel 2.6.28 9
Linux kernel 2.6.28 8
Linux kernel 2.6.28 6
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Linux kernel 2.6.28 1
Linux kernel 2.6.28 -rc7
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Linux kernel 2.6.28 -git7
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Linux kernel 2.6.27 6
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Linux kernel 2.6.27 24
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Linux kernel 2.6.27 12
Linux kernel 2.6.27 .8
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Trustix Secure Enterprise Linux 2.0
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Linux kernel 2.6.19 1
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Linux kernel 2.6.19 -rc1
Linux kernel 2.6.19
Trustix Secure Enterprise Linux 2.0
Trustix Secure Linux 2.2
Trustix Secure Linux 2.1
Trustix Secure Linux 2.0
Linux kernel 2.6.18 .4
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Trustix Secure Enterprise Linux 2.0
Trustix Secure Linux 2.2
Trustix Secure Linux 2.1
Trustix Secure Linux 2.0
Linux kernel 2.6.14 .5
Linux kernel 2.6.14 .4
Linux kernel 2.6.14 .3
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Linux kernel 2.6.13
Trustix Secure Enterprise Linux 2.0
Trustix Secure Linux 2.2
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Linux kernel 2.6.12 .6
Linux kernel 2.6.12 .5
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Ubuntu Ubuntu Linux 4.1 ppc
Ubuntu Ubuntu Linux 4.1 ia64
Ubuntu Ubuntu Linux 4.1 ia32
Linux kernel 2.6.8
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Linux kernel 2.6 -test9-CVS
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Linux kernel 2.6 -test11
Linux kernel 2.6 -test10
Linux kernel 2.6 -test1
Linux kernel 2.6
Linux kernel 2.6.8.1
S.u.S.E. Linux Personal 9.2 x86_64
S.u.S.E. Linux Personal 9.2
Ubuntu Ubuntu Linux 4.1 ppc
Ubuntu Ubuntu Linux 4.1 ia64
Ubuntu Ubuntu Linux 4.1 ia32
Linux kernel 2.6.31-rc9
Linux kernel 2.6.31-rc8
Linux kernel 2.6.31-rc7
Linux kernel 2.6.31-rc5-git3
Linux kernel 2.6.30.5
Linux kernel 2.6.30.4
Linux kernel 2.6.30.3
Linux kernel 2.6.29-rc2-git1
Linux kernel 2.6.29-rc2
Linux kernel 2.6.29-rc1
Linux kernel 2.6.28.4
Linux kernel 2.6.26.1
Linux kernel 2.6.26-rc5-git1
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Linux kernel 2.6.25.1
Linux kernel 2.6.25-rc1
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Linux kernel 2.6.24-rc2
Linux kernel 2.6.24-rc1
Linux kernel 2.6.23.14
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Linux kernel 2.6.23.1
Linux kernel 2.6.23.09
Linux kernel 2.6.22-rc7
Linux kernel 2.6.22-rc1
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Linux kernel 2.6.20.1
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Linux kernel 2.6.19 -rc6
Linux kernel 2.6.18-8.1.8.el5
Linux kernel 2.6.18-53
Linux kernel 2.6.18
Linux kernel 2.6.15.5
Linux kernel 2.6.15.11
Linux kernel 2.6.15-27.48
Linux kernel 2.6.11.4
厂商解决方案:

0.0004 Low

EPSS

Percentile

8.6%

JSON

Related for SSV:12439