MDKSA-2005:186-1 - Updated lynx packages fix remote buffer overflow
Posted on: 10/27/2005 01:12 AM

The Mandriva Security Team published a new security update: MDKSA-2005:186-1 - Updated lynx packages fix remote buffer overflow for Mandriva Linux. Here the announcement:

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Mandriva Linux Security Advisory MDKSA-2005:186-1
http://www.mandriva.com/security/
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Package : lynx
Date : October 26, 2005
Affected: 10.1, 10.2, 2006.0, Corporate 2.1, Corporate 3.0,
Multi Network Firewall 2.0
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Problem Description:

Ulf Harnhammar discovered a remote buffer overflow in lynx versions
2.8.2 through 2.8.5.

When Lynx connects to an NNTP server to fetch information about the
available articles in a newsgroup, it will call a function called
HTrjis() with the information from certain article headers. The
function adds missing ESC characters to certain data, to support
Asian character sets. However, it does not check if it writes outside
of the char array buf, and that causes a remote stack-based buffer
overflow, with full control over EIP, EBX, EBP, ESI and EDI.

Two attack vectors to make a victim visit a URL to a dangerous news
server are: (a) *redirecting scripts*, where the victim visits some
web page and it redirects automatically to a malicious URL, and
(b) *links in web pages*, where the victim visits some web page
and selects a link on the page to a malicious URL. Attack vector
(b) is helped by the fact that Lynx does not automatically display
where links lead to, unlike many graphical web browsers.

The updated packages have been patched to address this issue.

Update:

The previous patchset had a bug in the patches themselves, which was
uncovered by Klaus Singvogel of Novell/SUSE in auditing crashes on
some architectures.
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References:

http://cve.mitre.org/cgi-bin/cvename.cgi?nameƊN-2005-3120
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Updated Packages:

Corporate Server 2.1:
8f85c354b06417711e13abe45dcbf0d8 corporate/2.1/RPMS/lynx-2.8.5-0.10.3.C21mdk.dev.8.i586.rpm
74becbc3b1be96908c069180e36ff3b2 corporate/2.1/SRPMS/lynx-2.8.5-0.10.3.C21mdk.dev.8.src.rpm

Corporate Server 2.1/X86_64:
0a4e7145d0920dde82734f8036c50baa x86_64/corporate/2.1/RPMS/lynx-2.8.5-0.10.3.C21mdk.dev.8.x86_64.rpm
74becbc3b1be96908c069180e36ff3b2 x86_64/corporate/2.1/SRPMS/lynx-2.8.5-0.10.3.C21mdk.dev.8.src.rpm

Mandriva Linux 10.1:
80e0addf6efd297866bba33f4b8070b6 10.1/RPMS/lynx-2.8.5-1.2.101mdk.i586.rpm
13e5e506a05b448426d639d5e88a8896 10.1/SRPMS/lynx-2.8.5-1.2.101mdk.src.rpm

Mandriva Linux 10.1/X86_64:
db1f977046a8e8abd7d45d7345fde701 x86_64/10.1/RPMS/lynx-2.8.5-1.2.101mdk.x86_64.rpm
13e5e506a05b448426d639d5e88a8896 x86_64/10.1/SRPMS/lynx-2.8.5-1.2.101mdk.src.rpm

Corporate 3.0:
a8ab3968700c864e01df9c74ccb017ca corporate/3.0/RPMS/lynx-2.8.5-1.2.C30mdk.i586.rpm
221f02f4e097a52c261bb6b3bfc2bbab corporate/3.0/SRPMS/lynx-2.8.5-1.2.C30mdk.src.rpm

Corporate 3.0/X86_64:
af94e8d31c6a756137dd04351ad61f08 x86_64/corporate/3.0/RPMS/lynx-2.8.5-1.2.C30mdk.x86_64.rpm
221f02f4e097a52c261bb6b3bfc2bbab x86_64/corporate/3.0/SRPMS/lynx-2.8.5-1.2.C30mdk.src.rpm

Multi Network Firewall 2.0:
6f0684f762fa2ac999d7ef2517525152 mnf/2.0/RPMS/lynx-2.8.5-1.2.M20mdk.i586.rpm
13cad2c8ec6a61159e5b580758dad58b mnf/2.0/SRPMS/lynx-2.8.5-1.2.M20mdk.src.rpm

Mandriva Linux 10.2:
d8007bd3e271f0f602babf443d9d2304 10.2/RPMS/lynx-2.8.5-1.2.102mdk.i586.rpm
60109bc6dc9630175c87dd66c23a8e05 10.2/SRPMS/lynx-2.8.5-1.2.102mdk.src.rpm

Mandriva Linux 10.2/X86_64:
9ceb656aac6be9eb6af021a2bfd661a6 x86_64/10.2/RPMS/lynx-2.8.5-1.2.102mdk.x86_64.rpm
60109bc6dc9630175c87dd66c23a8e05 x86_64/10.2/SRPMS/lynx-2.8.5-1.2.102mdk.src.rpm

Mandriva Linux 2006.0:
f7887db43f04613eef47a56fd175a1cb 2006.0/RPMS/lynx-2.8.5-4.2.20060mdk.i586.rpm
b121d10b5f27c29b8096c64c6c4416bb 2006.0/SRPMS/lynx-2.8.5-4.2.20060mdk.src.rpm

Mandriva Linux 2006.0/X86_64:
55cbe960a042601656919aa944602de2 x86_64/2006.0/RPMS/lynx-2.8.5-4.2.20060mdk.x86_64.rpm
b121d10b5f27c29b8096c64c6c4416bb x86_64/2006.0/SRPMS/lynx-2.8.5-4.2.20060mdk.src.rpm
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To upgrade automatically use MandrivaUpdate or urpmi. The verification
of md5 checksums and GPG signatures is performed automatically for you.

All packages are signed by Mandriva for security. You can obtain the
GPG public key of the Mandriva Security Team by executing:

gpg --recv-keys --keyserver pgp.mit.edu 0x22458A98

You can view other update advisories for Mandriva Linux at:

http://www.mandriva.com/security/advisories

If you want to report vulnerabilities, please contact

security_(at)_mandriva.com
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Type Bits/KeyID Date User ID
pub 1024D/22458A98 2000-07-10 Mandriva Security Team
lt;security*mandriva.comgt;
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