CA ARCserve Backup Discovery Service Denial of Service Vulnerability

Title: CA ARCserve Backup Discovery Service Denial of Service
Vulnerability

CA Advisory Date: 2008-06-17

Reported By: Luigi Auriemma

Impact: A remote attacker can cause a denial of service.

Summary: CA ARCserve Backup contains a vulnerability in the
Discovery service (casdscsvc) that can allow a remote attacker to
cause a denial of service condition. CA has issued patches to
address the vulnerability. The vulnerability, CVE-2008-1979,
occurs due to insufficient verification of client data. An
attacker can make a request that can crash the service.

Mitigating Factors: None

Severity: CA has given this vulnerability a Medium risk rating.

Affected Products:
CA ARCserve Backup r12.0 Windows
CA ARCserve Backup r11.5 Windows SP3 and prior*
CA ARCserve Backup r11.1 Windows*
CA ARCserve Backup r11.1 Netware*
CA Server Protection Suite r2
CA Business Protection Suite r2
CA Business Protection Suite for Microsoft Small Business Server
Standard Edition r2
CA Business Protection Suite for Microsoft Small Business Server
Premium Edition r2

*Formerly known as BrightStor ARCserve Backup

Non-affected Products:
CA ARCserve Backup r11.5 Windows SP4

Affected Platforms:
Windows and Netware

Status and Recommendation:
CA has issued the following patches to address the
vulnerabilities.
CA ARCserve Backup r12.0 Windows: QO99574
CA ARCserve Backup r11.5 Windows: QO99575
For CA ARCserve Backup r11.5 Windows, the issue can also be
addressed by applying 11.5 SP4: QO99129
CA ARCserve Backup r11.1 Windows: QO99576
CA ARCserve Backup r11.1 Netware: QO99579
CA Protection Suites r2: QO99575

How to determine if you are affected:

CA ARCserve Backup r12.0 Windows:

1. Run the ARCserve Patch Management utility. From the Windows
   Start menu, it can be found under Programs->CA->ARCserve Patch
   Management->Patch Status.
2. The main patch status screen will indicate if patch “QO99574”
   is currently applied. If the patch is not applied, the
   installation is vulnerable.

For more information on the ARCserve Patch Management utility,
read document TEC446265.

Alternatively, use the file information below to determine if the
product installation is vulnerable.

CA ARCserve Backup r12.0 Windows,
CA ARCserve Backup r11.5 Windows,
CA ARCserve Backup r11.1 Windows,
CA ARCserve Backup r11.1 Netware,
CA Protection Suites r2*:

1. Using Windows Explorer, locate the file “asbrdcst.dll”. By
   default, the file is located in the
   “C:\Program Files\CA\SharedComponents\ARCserve Backup\CADS”
   directory on 32 bit systems and “C:\Program Files (x86)\CA\
   SharedComponents\ARCserve Backup\CADS” on 64 bit systems.
2. Right click on the file and select Properties.
3. Select the General tab.
4. If the file timestamp is earlier than indicated in the below
   table, the installation is vulnerable.

• For Protection Suites r2, use the file timestamp for CA ARCserve
  Backup r11.5 English

Product Ver Product Lang File Name File Sz Timestamp
(bytes)
12.0 Windows English asbrdcst.dll 324872 05/01/2008 12:11
12.0 Windows Spanish asbrdcst.dll 324872 05/01/2008 12:11
12.0 Windows Port-Braz asbrdcst.dll 320776 05/01/2008 12:11
12.0 Windows Japanese asbrdcst.dll 320776 05/01/2008 12:11
12.0 Windows Italian asbrdcst.dll 324872 05/01/2008 12:11
12.0 Windows German asbrdcst.dll 324872 05/01/2008 12:11
12.0 Windows French asbrdcst.dll 324872 05/01/2008 12:11
12.0 Windows Trad Chinese asbrdcst.dll 316680 05/01/2008 12:11
12.0 Windows Simp Chinese asbrdcst.dll 316680 05/01/2008 12:11
11.5 Windows English asbrdcst.dll 212992 04/22/2008 10:15:02
11.5 Windows Japanese asbrdcst.dll 208896 04/22/2008 14:28:52
11.5 Windows Simp Chinese asbrdcst.dll 204800 04/22/2008 14:30:54
11.5 Windows Trad Chinese asbrdcst.dll 204800 04/22/2008 14:33:28
11.5 Windows Italian asbrdcst.dll 212992 04/22/2008 14:31:46
11.5 Windows Port-Braz asbrdcst.dll 212992 04/22/2008 14:53:54
11.5 Windows German asbrdcst.dll 212992 04/22/2008 14:27:48
11.5 Windows French asbrdcst.dll 212992 04/22/2008 14:26:54
11.5 Windows Spanish asbrdcst.dll 212992 04/22/2008 14:32:38
11.1 Windows English asbrdcst.dll 204800 04/24/2008 11:21:26
11.1 Windows Japanese asbrdcst.dll 200704 04/24/2008 11:25:48
11.1 Windows Simp Chinese asbrdcst.dll 196608 04/24/2008 11:27:44
11.1 Windows Trad Chinese asbrdcst.dll 196608 04/24/2008 11:30:32
11.1 Windows Italian asbrdcst.dll 204800 04/24/2008 11:28:38
11.1 Windows Port-Braz asbrdcst.dll 204800 04/24/2008 11:38:52
11.1 Windows German asbrdcst.dll 204800 04/24/2008 11:24:38
11.1 Windows French asbrdcst.dll 204800 04/24/2008 11:23:38
11.1 Windows Spanish asbrdcst.dll 204800 04/24/2008 11:29:34
11.1 Windows Dutch asbrdcst.dll 204800 04/24/2008 11:33:24
11.1 Windows Polish asbrdcst.dll 204800 04/24/2008 11:38:02
11.1 Windows Russian asbrdcst.dll 204800 04/24/2008 11:39:44
11.1 Windows Turkish asbrdcst.dll 204800 04/24/2008 11:41:28
11.1 Windows Norwegian asbrdcst.dll 204800 04/24/2008 11:37:12
11.1 Windows Danish asbrdcst.dll 204800 04/24/2008 11:32:28
11.1 Windows Czech asbrdcst.dll 204800 04/24/2008 11:31:28
11.1 Windows Hungarian asbrdcst.dll 204800 04/24/2008 11:36:22
11.1 Windows Swedish asbrdcst.dll 204800 04/24/2008 11:40:38
11.1 Windows Finnish asbrdcst.dll 204800 04/24/2008 11:34:40
11.1 Windows Greek asbrdcst.dll 204800 04/24/2008 11:35:32
11.1 Netware English asbrdcst.dll 204800 04/24/2008 11:21:26

Workaround: As a temporary workaround, stop and disable the CA
ARCserve Discovery service. With the service disabled, deploying
agents using Auto-discovery will not work.

References (URLs may wrap):
CA Support:
http://support.ca.com/
Security Notice for CA ARCserve Discovery Service
https://support.ca.com/irj/portal/anonymous/phpsupcontent?contentID=178937
Solution Document Reference APARs:
QO99574, QO99575, QO99129, QO99576, QO99579
CA Security Response Blog posting:
CA ARCserve Backup Discovery Service Denial of Service Vulnerability
http://community.ca.com/blogs/casecurityresponseblog/archive/2008/06/18.aspx
Reported By:
Luigi Auriemma
http://aluigi.altervista.org/adv/carcbackazz-adv.txt
CVE References:
CVE-2008-1979 - casdscsvc denial of service
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2008-1979
OSVDB References: Pending
http://osvdb.org/

Changelog for this advisory:
v1.0 - Initial Release

Customers who require additional information should contact CA
Technical Support at http://support.ca.com.

For technical questions or comments related to this advisory,
please send email to vuln AT ca DOT com.

If you discover a vulnerability in CA products, please report your
findings to our product security response team.
https://support.ca.com/irj/portal/anonymous/phpsupcontent?contentID=177782

Regards,
Ken Williams ; 0xE2941985
Director, CA Vulnerability Research

CA, 1 CA Plaza, Islandia, NY 11749

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