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Security Advisory #2004-010

Package name: squid
Summary: Arbitary Code Execution
Advisory ID: TSSA-2004-010
Date: 2004-06-09
Affected versions: tinysofa enterprise server 1.0 tinysofa enterprise server 1.0-U1

Security Fixes

Description

squid:

• Remote exploitation of a buffer overflow vulnerability in Squid Web Proxy Cache [0] could allow a remote attacker to execute arbitrary code. Squid Web Proxy Cache supports Basic, Digest and NTLM authentication. The vulnerability specifically exists within the NTLM authentication helper routine, ntlm_check_auth(), located in helpers/ntlm_auth/SMB/libntlmssp.c:

    char *ntlm_check_auth(ntlm_authenticate * auth, int auth_length)
    {
        int rv;
        char pass[25] /*, encrypted_pass[40] */;
        char *domain =3D credentials;
        ...
        memcpy(pass, tmp.str, tmp.l);
        ...

The function contains a buffer overflow vulnerability due to a lack of bounds checking on the values copied to the 'pass' variable. Both the 'tmp.str' and 'tmp.l' variables used in the memcpy() call contain user-supplied data.

This problem has been assigned the name CAN-2004-0541 [1] by the=20 Common Vulnerabilities and Exposures (CVE) project.

This problem was first reported by iDEFENSE [2].=20

References

Recommended Action

We recommend that all systems with these packages installed be upgraded. Please note that if you do not need the functionality provided by this package, you may want to remove it from your system.

Location

All tinysofa updates are available from <URI:http://http.tinysofa.org/pub/tinysofa/updates/>
<URI:ftp://ftp.tinysofa.org/pub/tinysofa/updates/>

Automatic Updates

Users of the SWUP tool can enjoy having updates automatically installed using 'swup --upgrade'.

Questions?

Check out our mailing lists:
<URI:http://www.tinysofa.org/support/>

Verification

This advisory is signed with the tinysofa security sign key. This key is available from:
<URI:http://pgp.mit.edu:11371/pks/lookup?op=3Dget&search=3D0xAEDCBB4B>

All tinysofa packages are signed with the tinysofa stable sign key. This key is available from:
<URI:http://pgp.mit.edu:11371/pks/lookup?op=3Dget&search=3D0x0F1240A2>

The advisory is available from the tinysofa errata database at <URI:http://www.tinysofa.org/support/errata/>
or directly at
<URI:http://www.tinysofa.org/support/errata/2004/010.html>

MD5sums Of The Packages

1fc7bd552435e8c6605d1cdd064d2edc squid-2.5.STABLE5-6ts.i586.rpm

--
tinysofa Security Team <security at tinysofa dot org>