** Information type changed from Public to Public Security
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High Availability Team, which is subscribed to keepalived in Ubuntu.
https://bugs.launchpad.net/bugs/1374730
Title:
X509 certificate verification problem
Status in “keepalived” package in Ubuntu:
New
Bug description:
Hostname verification is an important step when verifying X509
certificates, however, people tend to miss the step when using
SSL/TLS, which might cause severe man in the middle attack and break
the entire TLS mechanism.
We believe that keepalived didn't check whether the hostname matches
the name in the ssl certificate and the expired date of the
certificate.
We found the vulnerability by static analysis, typically, a process of
verfication involves calling a chain of API, and we can deduce whether the
communication process is vulnerable by detecting whether the process satisfies
a certain relation.
The result format is like this:
notice: Line Number@Method Name, Source File
We provide this result to help developers to locate the problem
faster.
This is the result for keepalived:
PDG]ssl_connect'1
[Found]SSL_connect()
[HASH] 1598777261 [LineNo]@ 211[Kind]call-site[Char] SSL_connect()[Src]
/home/roca/workspace/codebase/code/ubuntu_pkg/keepalived/keepalived-1.2.2/keepalived/check/check_ssl.c
[Warning] SSL_new() not found!
[PDG]ssl_connect
[Found]SSL_connect()
[HASH] 2061808858 [LineNo]@ 107[Kind]call-site[Char] SSL_connect()[Src]
/home/roca/workspace/codebase/code/ubuntu_pkg/keepalived/keepalived-1.2.2/genhash/ssl.c
[Warning] SSL_new() not found!
We don't have a POC because we didn't succeed in configuring this software or
don't know the way to verify the vulnerability. But through the analysis of the
source code, we believe it breaks the ssl certificate verfication protocol.
for more information about the importance of checking hostname:
see http://people.stfx.ca/x2011/x2011ucj/SSL/p38-georgiev.pdf
Thanks.
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