CVE-2014-8132: Double Free
First published: Tue Oct 28 2014(Updated: )
Description of problem: Maybe it is possible to send a malicious kexinit package to eventually cause a server to a double-free. I guess this is only a DoS. Source code: <a href="http://git.libssh.org/projects/libssh.git/">http://git.libssh.org/projects/libssh.git/</a> Patch: From f6b9f851b962e3a587f3f99b7cb97d130f0c77b9 Mon Sep 17 00:00:00 2001 From: Jon Simons <jon> Date: Sat, 18 Oct 2014 23:23:26 -0700 Subject: [PATCH] kex: fixup error path in ssh_packet_kexinit Before this change, dangling pointers can be unintentionally left in the respective next_crypto kex methods slots. Ensure to set all slots to NULL in the error-out path. Signed-off-by: Jon Simons <jon> --- src/kex.c | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/src/kex.c b/src/kex.c index f1a1b56..ee00ec3 100644 --- a/src/kex.c +++ b/src/kex.c @@ -443,6 +443,11 @@ SSH_PACKET_CALLBACK(ssh_packet_kexinit){ error: ssh_string_free(str); for (i = 0; i < SSH_KEX_METHODS; i++) { + if (server_kex) { + session->next_crypto->client_kex.methods[i] = NULL; + } else { /* client */ + session->next_crypto->server_kex.methods[i] = NULL; + } SAFE_FREE(strings[i]); } -- 1.9.1
Credit: secalert@redhat.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Libssh Libssh | =0.5.0 | |
| Libssh Libssh | =0.5.2 | |
| Libssh Libssh | =0.5.3 | |
| Libssh Libssh | =0.5.4 | |
| Libssh Libssh | =0.5.5 | |
| Libssh Libssh | =0.6.0 | |
| Libssh Libssh | =0.6.1 | |
| Libssh Libssh | =0.6.2 | |
| Libssh Libssh | =0.6.3 | |
| Debian Debian Linux | =7.0 | |
| Debian Debian Linux | =8.0 | |
| openSUSE openSUSE | =12.3 | |
| openSUSE openSUSE | =13.1 | |
| openSUSE openSUSE | =13.2 | |
| Fedoraproject Fedora | =19 | |
| Fedoraproject Fedora | =20 | |
| Fedoraproject Fedora | =21 | |
| Canonical Ubuntu Linux | =12.04 | |
| Canonical Ubuntu Linux | =14.04 | |
| Canonical Ubuntu Linux | =14.10 |
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Reference Links
- http://git.libssh.org/projects/libssh.git/
- https://access.redhat.com/security/cve/CVE-2014-8132
- http://www.libssh.org/2014/12/19/libssh-0-6-4-security-and-bugfix-release/
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=1176145
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=1176146
- https://bugzilla.redhat.com/show_bug.cgi?id=1158089
- http://advisories.mageia.org/MGASA-2015-0014.html
- http://lists.fedoraproject.org/pipermail/package-announce/2015-January/147367.html
- http://lists.fedoraproject.org/pipermail/package-announce/2015-January/147452.html
- http://lists.fedoraproject.org/pipermail/package-announce/2015-January/147464.html
- http://lists.opensuse.org/opensuse-updates/2015-01/msg00007.html
- http://secunia.com/advisories/60838
- http://www.debian.org/security/2016/dsa-3488
- http://www.mandriva.com/security/advisories?name=MDVSA-2015:020
- http://www.ubuntu.com/usn/USN-2478-1
- https://security.gentoo.org/glsa/201606-12
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