REDHAT-BUG-1158089
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
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Ubuntu |
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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
Frequently Asked Questions
What is the severity of REDHAT-BUG-1158089?
The severity of REDHAT-BUG-1158089 is primarily classified as a Denial of Service (DoS) vulnerability.
How do I fix REDHAT-BUG-1158089?
To fix REDHAT-BUG-1158089, you should apply the latest patches provided by the Libssh project.
What are the potential impacts of exploiting REDHAT-BUG-1158089?
Exploitation of REDHAT-BUG-1158089 can lead to a double-free vulnerability, which may result in a crash of the server.
Which software versions are affected by REDHAT-BUG-1158089?
The specific versions of Libssh affected by REDHAT-BUG-1158089 are not detailed, but it is important to check for updates on the official Libssh platform.
Is REDHAT-BUG-1158089 being actively monitored?
Yes, REDHAT-BUG-1158089 is under active monitoring and being addressed in regular security updates.
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