CVE-2011-1593: Integer Overflow
First published: Tue Apr 19 2011(Updated: )
A signedness issue has been found in next_pidmap() function when the "last" parameter is negative as next_pidmap() just quietly accepted whatever "last" pid that was passed in, which is not all that safe when one of the users is /proc. Setting f_pos to negative value when accessing /proc via readdir()/getdents() resulted in sign extension of this value when map pointer was being constructed. This later lead to #GP becasue the final pointer was not cannonical (x86_64). map = &pid_ns->pidmap[(last + 1)/BITS_PER_PAGE]; ffffffff810ac3b4: 48 63 f6 movslq %esi,%rsi <- sign extension (f_pos+-) ffffffff810ac3b7: 81 e2 ff 7f 00 00 and $0x7fff,%edx ffffffff810ac3bd: 48 c1 ee 0f shr $0xf,%rsi ffffffff810ac3c1: 48 c1 e6 04 shl $0x4,%rsi ffffffff810ac3c5: 48 8d 5c 37 08 lea 0x8(%rdi,%rsi,1),%rbx ... if (unlikely(!map->page)) ffffffff810ac3cc: 48 8b 7b 08 mov 0x8(%rbx),%rdi <- #GP Only x86_64 architecture seems to be vulnerable to this particular issue (tested ppc64, s390x, ia64). Reference: <a href="http://groups.google.com/group/fa.linux.kernel/browse_thread/thread/93c1088451fd3522/4a28ecb7f755a88d?#4a28ecb7f755a88d">http://groups.google.com/group/fa.linux.kernel/browse_thread/thread/93c1088451fd3522/4a28ecb7f755a88d?#4a28ecb7f755a88d</a> Upstream commit: <a href="http://git.kernel.org/linus/c78193e9">http://git.kernel.org/linus/c78193e9</a> <a href="http://git.kernel.org/linus/d8bdc59f">http://git.kernel.org/linus/d8bdc59f</a> Acknowledgements: Red Hat would like to thank Robert Swiecki for reporting this issue.
Credit: secalert@redhat.com secalert@redhat.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Linux Linux kernel | <2.6.38.4 | |
| Redhat Enterprise Linux Server | =5.0 | |
| Redhat Enterprise Linux Workstation | =5.0 | |
| Redhat Enterprise Linux | =5.0 | |
| Redhat Enterprise Linux Desktop | =5.0 | |
| Redhat Enterprise Linux Eus | =5.6 | |
| Redhat Enterprise Linux Aus | =5.6 | |
| Canonical Ubuntu Linux | =8.04 | |
| debian/linux-2.6 |
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Reference Links
- http://openwall.com/lists/oss-security/2011/04/20/1
- http://groups.google.com/group/fa.linux.kernel/msg/4a28ecb7f755a88d?dmode=source
- http://secunia.com/advisories/44164
- https://bugzilla.redhat.com/show_bug.cgi?id=697822
- http://securitytracker.com/id?1025420
- http://openwall.com/lists/oss-security/2011/04/19/1
- http://www.securityfocus.com/bid/47497
- http://www.kernel.org/pub/linux/kernel/v2.6/ChangeLog-2.6.38.4
- http://www.ubuntu.com/usn/USN-1146-1
- http://rhn.redhat.com/errata/RHSA-2011-0927.html
- https://exchange.xforce.ibmcloud.com/vulnerabilities/66876
- http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git%3Ba=commit%3Bh=c78193e9c7bcbf25b8237ad0dec82f805c4ea69b
- http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git%3Ba=commit%3Bh=d8bdc59f215e62098bc5b4256fd9928bf27053a1
- https://launchpad.net/bugs/cve/CVE-2011-1593
- http://groups.google.com/group/fa.linux.kernel/browse_thread/thread/93c1088451fd3522/4a28ecb7f755a88d?#4a28ecb7f755a88d
- http://git.kernel.org/linus/c78193e9
- http://git.kernel.org/linus/d8bdc59f
- https://rhn.redhat.com/errata/RHSA-2011-0927.html
- https://rhn.redhat.com/errata/RHSA-2011-1189.html
- https://rhn.redhat.com/errata/RHSA-2011-1253.html
- https://access.redhat.com/support/policy/updates/errata/
- https://security-tracker.debian.org/tracker/CVE-2011-1593
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2011-1593
- https://nvd.nist.gov/vuln/detail/CVE-2011-1593
- https://ubuntu.com/security/CVE-2011-1593
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