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TITLE:
SILC "silc_pkcs1_decode" Integer Overflow Vulnerability

SECUNIA ADVISORY ID:
SA29463

VERIFY ADVISORY:
http://secunia.com/advisories/29463/

CRITICAL:
Highly critical

IMPACT:
DoS, System access

WHERE:
>From remote

SOFTWARE:
SILC Secure Internet Live Conferencing Toolkit 1.x
http://secunia.com/product/14731/
SILC Secure Internet Live Conferencing Server 1.x
http://secunia.com/product/1029/
SILC Secure Internet Live Conferencing Client 1.x
http://secunia.com/product/5645/

DESCRIPTION:
A vulnerability has been reported in SILC Client, Server, and
Toolkit, which can be exploited by malicious people to cause a DoS
(Denial of Service) and potentially compromise a vulnerable system.

The vulnerability is caused due to an integer overflow error in the
"silc_pkcs1_decode" function in lib/silccrypt/silcpkcs1.c. This can
be exploited to cause a buffer overflow via a specially crafted
PKCS#1 block.

The vulnerability is reported in SILC Toolkit prior to 1.1.7, SILC
Client prior to 1.1.4, and SILC Server prior to 1.1.2.

SOLUTION:
SILC Toolkit:
Update to version 1.1.7.
http://silcnet.org/software/download/toolkit/

SILC Client:
Update to version 1.1.4.
http://silcnet.org/software/download/client/

SILC Server:
Update to version 1.1.2.
http://silcnet.org/software/download/server/

PROVIDED AND/OR DISCOVERED BY:
Ariel Waissbein, Pedro Varangot, Martin Mizrahi, Oren Isacson, Carlos
Garcia, and Ivan Arce of Core Security Technologies.

ORIGINAL ADVISORY:
SILC:
http://silcnet.org/general/news/?item=toolkit_20080320_1
http://silcnet.org/general/news/?item=client_20080320_1
http://silcnet.org/general/news/?item=server_20080320_1

Core Security:
http://www.coresecurity.com/?action=item&id=2206

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About:
This Advisory was delivered by Secunia as a free service to help
everybody keeping their systems up to date against the latest
vulnerabilities.

Subscribe:
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http://secunia.com/about_secunia_advisories/


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