Protect yourself against future threats.
-----BEGIN PGP SIGNED MESSAGE----- =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2000.211 -- NetBSD Security Advisory 2000-011 vulnerability in netscape versions prior to 4.74 14 August 2000 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: Netscape Navigator Netscape Communicator Vendor: NetBSD Operating System: NetBSD Platform: N/A Impact: Execute Arbitrary Code/Commands Access Required: Remote - --------------------------BEGIN INCLUDED TEXT-------------------- - -----BEGIN PGP SIGNED MESSAGE----- NetBSD Security Advisory 2000-011 ================================= Topic: vulnerability in netscape versions prior to 4.74 Version: NetBSD pkgsrc prior to 25th July 2000. Severity: buffer overrun in JPEG parser. Abstract ======== Note: The Netscape Communicator and Navigator packages are not part of the base NetBSD distribution, and are not installed by default. They are part of the NetBSD package collection, which contains a large number of third-party applications in ready-to-install format. NetBSD makes no claim about the suitability or security of these third-party applications; however, when we become aware of severe security holes in commonly used packages, we may release advisories such as this one. Netscape's processing of JPEG comments trusted the length parameter for comment fields; by manipulating this value, it is possible to cause netscape to read in an excessive amount of data, overwriting memory. Specially designed data could allow a remote site to execute arbitrary code as the user of netscape. This vulnerability has been fixed in Netscape 4.74. Solutions and Workarounds ========================= Versions of Netscape Communicator and Navigator older than version 4.74 are vulnerable. To find out the version of Communicator or Navigator installed on your NetBSD system, you can use pkg_info(1): # pkg_info -e communicator-* # pkg_info -e navigator-* If Communicator or Navigator is not installed on your system, no output will be generated, and your system is not vulnerable to this problem. If you have a version older than 4.74, you should upgrade to version 4.74 (or newer) of Netscape Communicator and/or Navigator. A corrected version has been part of the NetBSD packages collection since 25th July 2000. If a vulnerable version of Communicator or Navigator is installed, then you should immediately remove the vulnerability by deleting the package. As root, type: # pkg_delete -v communicator-* # pkg_delete -v navigator-* If you continue to need Communicator or Navigator, you should install a new version of the package. You can use the pkgsrc infrastructure to download the precompiled binaries directly from their home site. First, make sure that you have a version of the pkgsrc hierarchy from 25th July 2000 or later. (See http://www.netbsd.org/Sites/net.html for ways to obtain NetBSD, and pkgsrc, its packages collection.) You can then install the new version of the packages: cd pkgsrc/www/communicator; make clean; make install and/or cd pkgsrc/www/navigator; make clean; make install For more information on how to rebuild a package from source for your architecture, see ftp://ftp.netbsd.org/pub/NetBSD/packages/pkgsrc/README Thanks To ========= Alistair G. Crooks <agc@netbsd.org> Revision History ================ 2000/08/02 original draft 2000/08/08 release More Information ================ Information about NetBSD and NetBSD security can be found at http://www.NetBSD.ORG/ and http://www.NetBSD.ORG/Security/. Copyright 2000, The NetBSD Foundation, Inc. All Rights Reserved. $NetBSD: NetBSD-SA2000-011.txt,v 1.3 2000/08/09 02:33:36 sommerfeld Exp $ - -----BEGIN PGP SIGNATURE----- Version: 2.6.3ia Charset: noconv iQCVAwUBOZDDzT5Ru2/4N2IFAQH1eAP9H9pBT4dhBHD95QYQto48GpJon31MkHcM ySeym13PTO6YzI+HWAjv8qBnbgtN3IYu3+2wp3JY9Oh9eyKvCeq0BPaH07oJhonn oNInDlDg4px1gYbHA56QtGND2IvCUYnetSeNRz2veOJPpEeJh1gB68pZoqBgAYuj tSENLl4o4oY= =BE9t - -----END PGP SIGNATURE----- - --------------------------END INCLUDED TEXT-------------------- This security bulletin is provided as a service to AusCERT's members. As AusCERT did not write the document quoted above, AusCERT has had no control over its content. The decision to use any or all of this information is the responsibility of each user or organisation, and should be done so in accordance with site policies and procedures. NOTE: This is only the original release of the security bulletin. It may not be updated when updates to the original are made. If downloading at a later date, it is recommended that the bulletin is retrieved directly from the original authors to ensure that the information is still current. Contact information for the authors of the original document is included in the Security Bulletin above. If you have any questions or need further information, please contact them directly. Previous advisories and external security bulletins can be retrieved from: http://www.auscert.org.au/Information/advisories.html If you believe that your system has been compromised, contact AusCERT or your representative in FIRST (Forum of Incident Response and Security Teams). Internet Email: auscert@auscert.org.au Facsimile: (07) 3365 7031 Telephone: (07) 3365 4417 (International: +61 7 3365 4417) AusCERT personnel answer during Queensland business hours which are GMT+10:00 (AEST). On call after hours for emergencies. -----BEGIN PGP SIGNATURE----- Version: 2.6.3i Charset: noconv Comment: ftp://ftp.auscert.org.au/pub/auscert/AUSCERT_PGP.key iQCVAwUBOZgIOih9+71yA2DNAQGPGwP9GJMcLoM2sy883T3dOnOFna2vM1Ag492W 5l+ko6Wk8nwcbntOHU8ikKDaPy5tPTPGSnC3OebiFOGV/ZciKoe0vWCWPXtYceF0 ouC00hCo2bfgHRK3y0kk38UvR2mY7LmBewVQXzgCglMWaz4rZNk9syy6Do5Il3GW ProzCGsMlwY= =nX2Q -----END PGP SIGNATURE-----