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OpenSSH Information for VU#368819
| Date Notified: | 2002-02-22 |
| Date Updated: | |
| Statement Date: | |
| Status Summary: | Vulnerable |
Vendor StatementOpenSSH itself relies on zlib as a third party library. OpenSSH's internal malloc state might get corrupted if the double-free bug is present in zlib. At this moment, it is not known if this bug will allow an intruder to gain privileges.
For some malloc implementation it is possible to detect and ignore the double-free. However, that is entirely dependent on the malloc implementation. Currently, it seems that *BSD operating systems might not be affected by this problem.
We advise everybody to upgrade their third party libraries and recompile OpenSSH if necessary. Turning off compression in the server is possible only by removing zlib from myproposal.h and subsequent recompliation.
Index: myproposal.h
===================================================================
RCS file: /cvs/src/usr.bin/ssh/myproposal.h,v
retrieving revision 1.13
diff -u -r1.13 myproposal.h
--- myproposal.h 21 Jan 2002 22:30:12 -0000 1.13
+++ myproposal.h 12 Mar 2002 17:36:11 -0000
@@ -32,7 +32,7 @@
"hmac-md5,hmac-sha1,hmac-ripemd160," \
"hmac-ripemd160@openssh.com," \
"hmac-sha1-96,hmac-md5-96"
-#define KEX_DEFAULT_COMP "none,zlib"
!)+#define KEX_DEFAULT_COMP "none"
#define KEX_DEFAULT_LANG ""Vendor InformationThe vendor has not provided us with any further information regarding this vulnerability.
AddendumThe CERT/CC has no additional comments at this time.
If you have feedback, comments, or additional information about this vulnerability, please send us
email.
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