Linux Security
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Linux Security

Debian: New postfix packages fix privilege escalation

Date 18 Aug 2008
Posted By LinuxSecurity Advisories
Sebastian Krahmer discovered that Postfix, a mail transfer agent, incorrectly checks the ownership of a mailbox. In some configurations, this allows for appending data to arbitrary files as root.
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Debian Security Advisory DSA-1629-1                  This email address is being protected from spambots. You need JavaScript enabled to view it.                          Thijs Kinkhorst
August 18, 2008             
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Package        : postfix
Vulnerability  : programming error
Problem type   : local
Debian-specific: no
CVE Id(s)      : CVE-2008-2936

Sebastian Krahmer discovered that Postfix, a mail transfer agent,
incorrectly checks the ownership of a mailbox. In some configurations,
this allows for appending data to arbitrary files as root.

The default Debian installation of Postfix is not affected. Only a
configuration meeting the following requirements is vulnerable:
 * The mail delivery style is mailbox, with the Postfix built-in
   local(8) or virtual(8) delivery agents.
 * The mail spool directory is user-writeable.
 * The user can create hardlinks pointing to root-owned symlinks
   located in other directories.

For a detailed treating of this issue, please refer to the upstream
author's announcement:

For the stable distribution (etch), this problem has been fixed in
version 2.3.8-2etch1.

For the testing distribution (lenny), this problem has been fixed in
version 2.5.2-2lenny1.

For the unstable distribution (sid), this problem has been fixed
in version 2.5.4-1.

We recommend that you upgrade your postfix package.

Upgrade instructions
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wget url
        will fetch the file for you
dpkg -i file.deb
        will install the referenced file.

If you are using the apt-get package manager, use the line for
sources.list as given below:

apt-get update
        will update the internal database
apt-get upgrade
        will install corrected packages

You may use an automated update by adding the resources from the
footer to the proper configuration.

Debian GNU/Linux 4.0 alias etch
- -------------------------------

Source archives:
    Size/MD5 checksum:  2787761 a6c560657788fc7a5444fa9ea32f5513
    Size/MD5 checksum:   177462 0827e61a7033e8625d92123c84b32782
    Size/MD5 checksum:      907 8e9f0c462c57eb2be521714404474aca

Architecture independent packages:
    Size/MD5 checksum:   130818 5038e376db1c661eb0284f96dff4761a
    Size/MD5 checksum:   785408 5db9bdc0300637afd3d508afe2c261dc

alpha architecture (DEC Alpha)
    Size/MD5 checksum:  1188364 c8c7f45763ccfd74b84335ea073c551c
    Size/MD5 checksum:    36556 fcb1c6262baed1402032c2105b83d059
    Size/MD5 checksum:    38746 a0d1334395beda433d586b63b0d60b80
    Size/MD5 checksum:    43408 d9e830efc4532ccddc46f394232959a6
    Size/MD5 checksum:    38596 855c8573280d5b191a12175b2e7afe8c
    Size/MD5 checksum:    38928 579217f55db12977c61b8d437f3ab436

amd64 architecture (AMD x86_64 (AMD64))
    Size/MD5 checksum:    38318 24205dd0481bb1d78684167d8d20f44f
    Size/MD5 checksum:    38338 50a46f34f638ea42525b98ca985b4f11
    Size/MD5 checksum:    43268 a24dd35f2ec288c2c4f674099e44385f
    Size/MD5 checksum:  1148848 f27f053dffd95b730f1186ed37ed8673
    Size/MD5 checksum:    38460 907b2a8d84a54cdf31ade8c201d3780a
    Size/MD5 checksum:    36378 1ab120583bcc5873a5350d9786282eab

arm architecture (ARM)
    Size/MD5 checksum:    42742 2d6799c7726a3943a39939baebacdc98
    Size/MD5 checksum:    38324 6acd31d6ce0200fdd49043c99459c4c8
    Size/MD5 checksum:    38394 52628e6399391671a8512ed25739813c
    Size/MD5 checksum:    38592 1db4a21bb2c6f135e342b65317ecb897
    Size/MD5 checksum:  1080626 3e05804bf0bf7101ae3e4eec33d1524f
    Size/MD5 checksum:    36378 71361b9cd3c008a9e96e8c23866b1a80

hppa architecture (HP PA RISC)
    Size/MD5 checksum:    37504 76b3b4785a5e91fc1010ce32ccee31ed
    Size/MD5 checksum:    45296 73bc72e54d6ef6909fd3df4266061d7b
    Size/MD5 checksum:    40138 807908ccb69444d9aa1917861dc51af9
    Size/MD5 checksum:  1174040 44260c5be83cd1d051de22c155aee72a
    Size/MD5 checksum:    39814 547026b4994dfbf216be7f9ee0487054
    Size/MD5 checksum:    39624 69209a3695bb1568f8c11e6ab4bb792d

i386 architecture (Intel ia32)
    Size/MD5 checksum:    36514 2c10b797c15b02828b344693d4f9c597
    Size/MD5 checksum:    38680 d1beb196bcc090457a791760b5e7bdfd
    Size/MD5 checksum:    38354 d074798f79b42bd245e13b8ce0f3adef
    Size/MD5 checksum:    43160 40cc3fc2fc6374a07893321c2758a447
    Size/MD5 checksum:    38770 d97f22246f4cb6cb48e4c993ad37daac
    Size/MD5 checksum:  1092656 30352104ad6fad91f13b996483e52e5b

ia64 architecture (Intel ia64)
    Size/MD5 checksum:    37958 d3628d8f8d4fa6cc760ef77e21acb468
    Size/MD5 checksum:    40762 6c5dcb7f2d6196ddf23a8e6d7b9e5f10
    Size/MD5 checksum:    47878 bb8188e31d1a632164d1bb5dda88a810
    Size/MD5 checksum:  1439608 cfc2f5db48f0f6bcc8ddb3e85a4032d6
    Size/MD5 checksum:    40766 59cd143a5727868aaae30f309286a433
    Size/MD5 checksum:    41066 385bf68a76cd27e12e012bf535a841e0

mips architecture (MIPS (Big Endian))
    Size/MD5 checksum:    38194 014b70898f5aae21a95877c4e32f9941
    Size/MD5 checksum:    36186 7c957d531808b35bd6994aeea448e213
    Size/MD5 checksum:    38188 29a16989a6414ed3722f1422f46d9cd2
    Size/MD5 checksum:    38446 0dc8cfc6f527161b8b4ce16dd8b297c6
    Size/MD5 checksum:  1129132 4e6a95c1f4040b7b24ac18ab80455d4d
    Size/MD5 checksum:    42376 af1d25a56c756443db89f6aa6a7bbb38

powerpc architecture (PowerPC)
    Size/MD5 checksum:    37738 ee3c0924d5deb0d61741c9497156c0bf
    Size/MD5 checksum:    44218 6ade57e38f9948016b71e6373f6f1863
    Size/MD5 checksum:    39670 6a6597cfb2a225d05963a149386d8fcc
    Size/MD5 checksum:    39774 3979adcff1c659588beb2e65c5ddb4d3
    Size/MD5 checksum:  1167716 45d3590893a6b4c3efc99780508f92e1
    Size/MD5 checksum:    39966 7acc51d59c4c640b8c4963c09c573356

s390 architecture (IBM S/390)
    Size/MD5 checksum:    38752 56864ace555741a8e580ac9cdad129c3
    Size/MD5 checksum:  1154368 f62e41e9b4d18eaaf76d0096370ceb1f
    Size/MD5 checksum:    36562 9deaaf037d9694a5a09f01743c687a52
    Size/MD5 checksum:    38360 6191ba334c80aa5e4dd12df40781c96d
    Size/MD5 checksum:    43310 9a73eaee5cfd0b3656976a36c256e676
    Size/MD5 checksum:    38918 570c0d157fd6b6b4102122a965d3e6f6

sparc architecture (Sun SPARC/UltraSPARC)
    Size/MD5 checksum:    38198 6ca537558089e41ebbdea7c90f2e4fd4
    Size/MD5 checksum:    37906 746615a2cc165a0fcb5aff5be073e289
    Size/MD5 checksum:    38058 ac84629509e45bf424752e4852e175e1
    Size/MD5 checksum:    36106 55d00480a61daa52578d69081a4e93a6
    Size/MD5 checksum:  1080776 87ff76ea63ba069b769b3491fac51670
    Size/MD5 checksum:    42910 767373c92a53b62640e69b16749f1fcc

  These files will probably be moved into the stable distribution on
  its next update.

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For apt-get: deb stable/updates main
For dpkg-ftp: dists/stable/updates/main
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