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Category: Application (Security) > Mod_ssl

Vendors: Modssl.org

(Debian Issues Fix) Apache mod_ssl Stack Overflow in ssl_util_uuencode_binary() May Let Remote Users Execute Arbitrary Code

SecurityTracker Alert ID: 1010766

SecurityTracker URL: http://securitytracker.com/id?1010766

CVE Reference: CAN-2004-0488 (Links to External Site)

Date: Jul 23 2004

Impact: Execution of arbitrary code via network, User access via network

Fix Available: Yes Vendor Confirmed: Yes

Description: A buffer overflow vulnerability was reported in Apache mod_ssl. A remote user may be able to execute arbitrary code on the target system in certain situations.

Georgi Guninski reported that the ssl_util_uuencode_binary() function in 'ssl_util.c' may allow a remote user to supply a specially crafted Subject-DN in a client certificate to trigger the overflow. According to OpenPKG, the overflow resides in the "SSLOptions +FakeBasicAuth" implementation of mod_ssl and can be triggered if the Subject-DN is longer than 6 KB and mod_ssl is configured to trust the certificate's issuing CA.

Impact: A remote user may be able to execute arbitrary code on the target system in certain cases.

Vendor URL: www.modssl.org/ (Links to External Site)

Cause: Boundary error

Underlying OS: Linux (Debian)

Underlying OS Comments: 3.0

Reported By: Matt Zimmerman <mdz@debian.org>

Message History: This archive entry is a follow-up to the message listed below.

May 28 2004

Apache mod_ssl Stack Overflow in ssl_util_uuencode_binary() May Let Remote Users Execute Arbitrary Code

Source Message Contents

Date: Thu, 22 Jul 2004 20:29:33 -0700
From: Matt Zimmerman <mdz@debian.org>
Subject: [SECURITY] [DSA 532-1] New libapache-mod-ssl packages fix multiple vulnerabilities

 

-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1

- --------------------------------------------------------------------------
Debian Security Advisory DSA 532-1                     security@debian.org
http://www.debian.org/security/                             Matt Zimmerman
July 22nd, 2004                         http://www.debian.org/security/faq
- --------------------------------------------------------------------------

Package        : libapache-mod-ssl
Vulnerability  : several
Problem-Type   : remote
Debian-specific: no
CVE Ids        : CAN-2004-0488 CAN-2004-0700

Two vulnerabilities were discovered in libapache-mod-ssl:

  CAN-2004-0488 - Stack-based buffer overflow in the
  ssl_util_uuencode_binary function in ssl_util.c for Apache mod_ssl,
  when mod_ssl is configured to trust the issuing CA, may allow remote
  attackers to execute arbitrary code via a client certificate with a
  long subject DN.

  CAN-2004-0700 - Format string vulnerability in the ssl_log function
  in ssl_engine_log.c in mod_ssl 2.8.19 for Apache 1.3.31 may allow
  remote attackers to execute arbitrary messages via format string
  specifiers in certain log messages for HTTPS.

For the current stable distribution (woody), these problems have been
fixed in version 2.8.9-2.3.

For the unstable distribution (sid), CAN-2004-0488 was fixed in
version 2.8.18, and CAN-2004-0700 will be fixed soon.

We recommend that you update your libapache-mod-ssl package.

Upgrade Instructions
- --------------------

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 3.0 alias woody
- --------------------------------

  Source archives:

    http://security.debian.org/pool/updates/main/liba/libapache-mod-ssl/libapache-mod-ssl_2.8.9-2.3.d
sc
      Size/MD5 checksum:      678 6a21d08bfe122ad4165d7764d34f0acb
    http://security.debian.org/pool/updates/main/liba/libapache-mod-ssl/libapache-mod-ssl_2.8.9-2.3.d
iff.gz
      Size/MD5 checksum:    17915 b1769bb313f5b262b0ee377cae527e63
    http://security.debian.org/pool/updates/main/liba/libapache-mod-ssl/libapache-mod-ssl_2.8.9.orig.
tar.gz
      Size/MD5 checksum:   752613 aad438a4eaeeee29ae74483f7afe9db0

  Architecture independent components:

    http://security.debian.org/pool/updates/main/liba/libapache-mod-ssl/libapache-mod-ssl-doc_2.8.9-2
.3_all.deb
      Size/MD5 checksum:   303658 3cee43feb0382c94a91f37c869784211

  ARM architecture:

    http://security.debian.org/pool/updates/main/liba/libapache-mod-ssl/libapache-mod-ssl_2.8.9-2.3_a
rm.deb
      Size/MD5 checksum:   240152 8ea7ed4b9a52ad9104c1b7241bfcfa7e

  Intel IA-32 architecture:

    http://security.debian.org/pool/updates/main/liba/libapache-mod-ssl/libapache-mod-ssl_2.8.9-2.3_i
386.deb
      Size/MD5 checksum:   238974 ab879ea9c8f4a25fee9f297162a720c7

  Intel IA-64 architecture:

    http://security.debian.org/pool/updates/main/liba/libapache-mod-ssl/libapache-mod-ssl_2.8.9-2.3_i
a64.deb
      Size/MD5 checksum:   268784 4a9593779bf0a88d6508875301aefc0b

  HP Precision architecture:

    http://security.debian.org/pool/updates/main/liba/libapache-mod-ssl/libapache-mod-ssl_2.8.9-2.3_h
ppa.deb
      Size/MD5 checksum:   248170 bd367099eaea46b34f35bebfe0623ea3

  Motorola 680x0 architecture:

    http://security.debian.org/pool/updates/main/liba/libapache-mod-ssl/libapache-mod-ssl_2.8.9-2.3_m
68k.deb
      Size/MD5 checksum:   241190 6b535557a851a978ca24c5d99cacaf6e

  Big endian MIPS architecture:

    http://security.debian.org/pool/updates/main/liba/libapache-mod-ssl/libapache-mod-ssl_2.8.9-2.3_m
ips.deb
      Size/MD5 checksum:   236148 be9a58f7d4ebd346d6f763b55e27d4d9

  Little endian MIPS architecture:

    http://security.debian.org/pool/updates/main/liba/libapache-mod-ssl/libapache-mod-ssl_2.8.9-2.3_m
ipsel.deb
      Size/MD5 checksum:   236104 46d64b439ff98561b0b0567cda037ca3

  PowerPC architecture:

    http://security.debian.org/pool/updates/main/liba/libapache-mod-ssl/libapache-mod-ssl_2.8.9-2.3_p
owerpc.deb
      Size/MD5 checksum:   242008 97ce3ae75e342f817d16fca999a8f3ba

  IBM S/390 architecture:

    http://security.debian.org/pool/updates/main/liba/libapache-mod-ssl/libapache-mod-ssl_2.8.9-2.3_s
390.deb
      Size/MD5 checksum:   242124 8ee93b53824da39d4a500d29fe01df23

  Sun Sparc architecture:

    http://security.debian.org/pool/updates/main/liba/libapache-mod-ssl/libapache-mod-ssl_2.8.9-2.3_s
parc.deb
      Size/MD5 checksum:   244208 c680da2eca743338d02cdb50c6baec23

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

- ---------------------------------------------------------------------------------
For apt-get: deb http://security.debian.org/ stable/updates main
For dpkg-ftp: ftp://security.debian.org/debian-security dists/stable/updates/main
Mailing list: debian-security-announce@lists.debian.org
Package info: `apt-cache show <pkg>' and http://packages.debian.org/<pkg>
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