Bug 415351 - (CVE-2007-5971) CVE-2007-5971 krb5: double free in gssapi lib
CVE-2007-5971 krb5: double free in gssapi lib
Product: Security Response
Classification: Other
Component: vulnerability (Show other bugs)
All Linux
low Severity low
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Assigned To: Red Hat Product Security
: Security
Depends On: 434923 434924 435883 435884 438022 438023
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Reported: 2007-12-07 03:47 EST by Tomas Hoger
Modified: 2008-03-31 05:43 EDT (History)
2 users (show)

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Doc Type: Bug Fix
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Last Closed: 2008-03-31 05:43:07 EDT
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Description Tomas Hoger 2007-12-07 03:47:58 EST
Common Vulnerabilities and Exposures assigned an identifier CVE-2007-5971 to the following vulnerability:

Double-free vulnerability in the gss_krb5int_make_seal_token_v3 function in lib/gssapi/krb5/k5sealv3.c in MIT Kerberos 5 (krb5) has unknown impact and attack vectors.


Comment 2 Mark J. Cox (Product Security) 2007-12-14 04:41:42 EST
MIT say


This bug is a double-free condition which is not a practical
vulnerability due to the extreme difficulty of exploitation.  If
krb5_c_make_checksum() (in src/lib/gssapi/krb5/k5sealv3.c) fails,
"outbuf" may be freed twice.

   244          err = krb5_c_make_checksum(context, ctx->cksumtype, key,
   245                                     key_usage, &plain, &sum);
   246          zap(plain.data, plain.length);
   247          free(plain.data);
   248          plain.data = 0;
   249          if (err) {
   250              zap(outbuf,bufsize);
   251              free(outbuf);
   252              goto error;
   253          }
   290  error:
   291      free(outbuf);
   292      token->value = NULL;
   293      token->length = 0;
   294      return err;
   295  }

krb5_c_make_checksum() only fails if malloc() fails to allocate a very
small amount of memory.  To exploit this vulnerability, an attacker
would need to force a malloc() failure at exactly the point where
krb5_c_make_checksum is called.
Comment 3 Tomas Hoger 2008-02-18 08:21:49 EST
Upstream bug report:


Fix seems to be tagged for inclusion in upstream version 1.6.4.
Comment 4 Tomas Hoger 2008-02-18 08:50:07 EST
Upstream SVN commit:

Comment 9 Fedora Update System 2008-03-18 14:49:45 EDT
krb5-1.6.1-9.fc7 has been submitted as an update for Fedora 7
Comment 10 Fedora Update System 2008-03-18 14:50:37 EDT
krb5-1.6.2-14.fc8 has been submitted as an update for Fedora 8
Comment 11 Fedora Update System 2008-03-21 18:17:04 EDT
krb5-1.6.1-9.fc7 has been pushed to the Fedora 7 stable repository.  If problems still persist, please make note of it in this bug report.
Comment 12 Fedora Update System 2008-03-21 18:20:07 EDT
krb5-1.6.2-14.fc8 has been pushed to the Fedora 8 stable repository.  If problems still persist, please make note of it in this bug report.

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