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Topic :

possible memory leak in zlib compression

SecurityAlert : 3981

CVE : CVE-2008-1678

CWE : CWE-399

SecurityRisk : Medium Security Risk Medium

(About)

Remote Exploit : Yes

Local Exploit : No

Victim interaction required : No

Exploit Available : No

Credit : Dustin Kirkland

Published : 12.07.2008

Affected Software :

Openssl, Openssl, 0.9.8f
Openssl, Openssl, 0.9.8g
Openssl, Openssl, 0.9.8h

Advisory Content :

I'm trying to solve a reproducible memory leak that manifests itself
with SSL + Apache2:
https://bugs.launchpad.net/ubuntu/+source/apache2/+bug/224945

Valgrind, plus our own research, points to a possible memory leak in
crypto/comp/c_zlib.c in libssl0.9.8g.

We see:
struct zlib_state *state = -> (struct zlib_state
*)OPENSSL_malloc(sizeof(struct zlib_state));
allocating the data.

However, it does not seem that a zlib_stateful_free_ex_data() is called
to free it.

Thanks,
:-Dustin

Dustin Kirkland
Ubuntu Server Developer
Canonical, LTD
GPG: 1024D/83A61194
______________________________________________________________________
OpenSSL Project http://www.openssl.org
Development Mailing List openssl-dev@openssl.org
Automated List Manager majordomo@openssl.org

References :

https://issues.apache.org/bugzilla/show_bug.cgi?id=44975

https://bugs.edge.launchpad.net/bugs/224945

https://bugs.edge.launchpad.net/bugs/186339

http://svn.apache.org/viewvc?view=rev&revision=654119

http://security.gentoo.org/glsa/glsa-200807-06.xml

http://secunia.com/advisories/31026

http://marc.info/?l=openssl-dev&m=121060672602371&w=2

http://bugs.gentoo.org/show_bug.cgi?id=222643

Feedback :

If you have additional information or notice any errors regarding this security advisory, please use contact form or email us at info()securityreason()com.

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