Multiple Vendor BSD ftpd glob() Buffer Overflow Vulnerabilities

BID:2548

Info

Multiple Vendor BSD ftpd glob() Buffer Overflow Vulnerabilities

Bugtraq ID: 2548
Class: Boundary Condition Error
CVE: CVE-2001-0247
Remote: Yes
Local: No
Published: Apr 09 2001 12:00AM
Updated: Jul 11 2009 06:06AM
Credit: This vulnerability was discovered by Anthony Osborne and John McDonald of NAI's COVERT labs and published on April 9, 2001.
Vulnerable: SGI IRIX 6.5.11
SGI IRIX 6.5.10
SGI IRIX 6.5.8
SGI IRIX 6.5.7
SGI IRIX 6.5.6
SGI IRIX 6.5.5
SGI IRIX 6.5.4
SGI IRIX 6.5.3 m
SGI IRIX 6.5.3 f
SGI IRIX 6.5.3
SGI IRIX 6.5.2 m
SGI IRIX 6.5.1
SGI IRIX 6.5
OpenBSD OpenBSD 2.8
OpenBSD OpenBSD 2.7
OpenBSD OpenBSD 2.6
OpenBSD OpenBSD 2.5
OpenBSD OpenBSD 2.4
OpenBSD OpenBSD 2.3
NetBSD NetBSD 1.5
NetBSD NetBSD 1.4.3
NetBSD NetBSD 1.4.2
NetBSD NetBSD 1.4.1
NetBSD NetBSD 1.4
NetBSD NetBSD 1.3.3
NetBSD NetBSD 1.3.2
NetBSD NetBSD 1.3.1
NetBSD NetBSD 1.3
NetBSD NetBSD 1.2.1
MIT Kerberos 5 1.2.2
+ MandrakeSoft Multi Network Firewall 2.0
+ Mandriva Linux Mandrake 8.2 ppc
 + Mandriva Linux Mandrake 8.2
+ Mandriva Linux Mandrake 8.1 ia64
 + Mandriva Linux Mandrake 8.1
+ Redhat Linux 7.2 ia64
 + Redhat Linux 7.2 i386
 + Redhat Linux 7.2
+ Redhat Linux 7.1 ia64
 + Redhat Linux 7.1 i386
 + Redhat Linux 7.1 alpha
 + Redhat Linux 7.1
+ Redhat Linux 7.0 i386
 + Redhat Linux 7.0 alpha
 + Redhat Linux 7.0
MIT Kerberos 5 1.2.1
MIT Kerberos 5 1.2
MIT Kerberos 5 1.1.1
- Redhat Linux 7.1 ia64
 - Redhat Linux 7.1 i386
 - Redhat Linux 7.1 alpha
 - Redhat Linux 7.1
- Redhat Linux 7.0 i386
 - Redhat Linux 7.0 alpha
 - Redhat Linux 7.0
+ Redhat Linux 6.2 sparc
 + Redhat Linux 6.2 i386
 + Redhat Linux 6.2 alpha
 + Redhat Linux 6.2
 FreeBSD FreeBSD 4.2
FreeBSD FreeBSD 4.1.1
FreeBSD FreeBSD 4.1
FreeBSD FreeBSD 4.0
FreeBSD FreeBSD 3.5.1
FreeBSD FreeBSD 3.5
FreeBSD FreeBSD 3.4
FreeBSD FreeBSD 3.3
FreeBSD FreeBSD 3.2
FreeBSD FreeBSD 3.1
FreeBSD FreeBSD 3.0
FreeBSD FreeBSD 2.2.8
FreeBSD FreeBSD 2.2.6
FreeBSD FreeBSD 2.2.5
FreeBSD FreeBSD 2.2.4
FreeBSD FreeBSD 2.2.3
FreeBSD FreeBSD 2.2.2
FreeBSD FreeBSD 2.2
Compaq Tru64 5.1 a PK1 (BL1)
Compaq Tru64 5.1 a
Compaq Tru64 5.1 PK4 (BL18)
Compaq Tru64 5.1 PK3 (BL17)
Compaq Tru64 5.1
Compaq Tru64 5.0 f
Compaq Tru64 5.0 a PK3 (BL17)
Compaq Tru64 5.0 a
Compaq Tru64 5.0 PK4 (BL18)
Compaq Tru64 5.0 PK4 (BL17)
Compaq Tru64 5.0
Compaq Tru64 4.0 g PK3 (BL17)
Compaq Tru64 4.0 g
Compaq Tru64 4.0 f PK7 (BL18)
Compaq Tru64 4.0 f PK6 (BL17)
Compaq Tru64 4.0 f
Not Vulnerable: Compaq Tru64 5.1 a PK3 (BL3)
Compaq Tru64 5.1 a PK2 (BL2)
Compaq Tru64 5.1 PK5 (BL19)

Discussion

Multiple Vendor BSD ftpd glob() Buffer Overflow Vulnerabilities

The BSD ftp daemon and derivatives (such as IRIX ftpd or the ftp daemon shipped with Kerberos 5) contain a number of buffer overflows that may lead to a compromise of root access to malicious users.

During parsing operations, the ftp daemon assumes that there can never be more than 512 bytes of user-supplied data. This is because that is usually how much data is read from a socket. Because of this assumption, certain memory copy operations involving user data lack bounds checking.

It is possible for users to use metacharacters to expand file/path names through interpretation by glob() and exploit these overflowable conditions. In order to do so, the attacker's ftp account must be able to either create directories or directories with long enough names must exist already.

Any attacker to successfully exploit this vulnerability would gain root access on the target host.

Exploit / POC

Multiple Vendor BSD ftpd glob() Buffer Overflow Vulnerabilities

CORE has developed a working commercial exploit for their IMPACT product. This exploit is not otherwise publicly available or known to be circulating in the wild.

A number of exploits have been published.

Solution / Fix

Multiple Vendor BSD ftpd glob() Buffer Overflow Vulnerabilities

Solution:
MandrakeSoft released and advisory stating that the version of Proftpd distributed as part of Mandrake Linux is not vulnerable to glob() related buffer overflows.

OpenBSD has released a patch for the OpenBSD ftp daemon.

MIT has released source code patches for the ftp daemon shipped with Kerberos 5 1.2.2. Networks running older versions of Kerberos 5 should upgrade to 1.2.2, and apply the patch (listed below).

RedHat has released upgraded versions of their Kerberos 5 packages.

Immunix has released upgraded versions of their Kerberos 5 packages.

HP/Compaq has released fixes for Tru64.


MIT Kerberos 5 1.1.1

MIT Kerberos 5 1.2.2

OpenBSD OpenBSD 2.8

FreeBSD FreeBSD 3.0

FreeBSD FreeBSD 3.1

FreeBSD FreeBSD 3.2

FreeBSD FreeBSD 3.3

FreeBSD FreeBSD 3.4

FreeBSD FreeBSD 3.5

FreeBSD FreeBSD 3.5.1

FreeBSD FreeBSD 4.0

Compaq Tru64 4.0 g PK3 (BL17)

Compaq Tru64 4.0 f PK7 (BL18)

FreeBSD FreeBSD 4.1

FreeBSD FreeBSD 4.1.1

FreeBSD FreeBSD 4.2

Compaq Tru64 5.0 a PK3 (BL17)

References

Multiple Vendor BSD ftpd glob() Buffer Overflow Vulnerabilities

References:

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