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Secunia Security Advisory 51407

Secunia Security Advisory 51407
Posted Nov 27, 2012
Authored by Secunia | Site secunia.com

Secunia Security Advisory - Ubuntu has issued an update for libssh. This fixes multiple vulnerabilities, which can be exploited by malicious people to cause a DoS (Denial of Service) and compromise an application using the library.

tags | advisory, denial of service, vulnerability
systems | linux, ubuntu
SHA-256 | b59c6ac49c3e5060eb26707d25398330808fa7262a4252a81ff263de92b73d03

Secunia Security Advisory 51407

Change Mirror Download
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The final version of the CSI 6.0 has been released.
Find out why this is not just another Patch Management solution: http://secunia.com/blog/325/

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TITLE:
Ubuntu update for libssh

SECUNIA ADVISORY ID:
SA51407

VERIFY ADVISORY:
Secunia.com
http://secunia.com/advisories/51407/
Customer Area (Credentials Required)
https://ca.secunia.com/?page=viewadvisory&vuln_id=51407

RELEASE DATE:
2012-11-27

DISCUSS ADVISORY:
http://secunia.com/advisories/51407/#comments

AVAILABLE ON SITE AND IN CUSTOMER AREA:
* Last Update
* Popularity
* Comments
* Criticality Level
* Impact
* Where
* Solution Status
* Operating System / Software
* CVE Reference(s)

http://secunia.com/advisories/51407/

ONLY AVAILABLE IN CUSTOMER AREA:
* Authentication Level
* Report Reliability
* Secunia PoC
* Secunia Analysis
* Systems Affected
* Approve Distribution
* Remediation Status
* Secunia CVSS Score
* CVSS

https://ca.secunia.com/?page=viewadvisory&vuln_id=51407

ONLY AVAILABLE WITH SECUNIA CSI AND SECUNIA PSI:
* AUTOMATED SCANNING

http://secunia.com/vulnerability_scanning/personal/
http://secunia.com/vulnerability_scanning/corporate/wsus_sccm_3rd_third_party_patching/

DESCRIPTION:
Ubuntu has issued an update for libssh. This fixes multiple
vulnerabilities, which can be exploited by malicious people to cause
a DoS (Denial of Service) and compromise an application using the
library.

1) Some double-free errors exist within the "agent_sign_data()",
"channel_request()", "ssh_userauth_pubkey()", "sftp_parse_attr_3()",
"sftp_mkdir()", and "try_publickey_from_file()" functions.

2) Two off-by-one errors exist within the "ssh_path_expand_tilde()"
and "ssh_path_expand_escape()" functions.

3) Some errors within the "publickey_make_dss()",
"publickey_make_rsa()", "signature_from_string()", "ssh_do_sign()",
and "ssh_sign_session_id()" functions can be exploited to free an
invalid pointer and cause a crash.

SOLUTION:
Apply updated packages.

Further details available in Customer Area:
http://secunia.com/vulnerability_intelligence/

PROVIDED AND/OR DISCOVERED BY:
Xi Wang and Florian Weimer

ORIGINAL ADVISORY:
USN-1640-1:
http://www.ubuntu.com/usn/usn-1640-1/

libssh:
http://www.libssh.org/2012/11/20/libssh-0-5-3-security-release/

OTHER REFERENCES:
Further details available in Customer Area:
http://secunia.com/vulnerability_intelligence/

DEEP LINKS:
Further details available in Customer Area:
http://secunia.com/vulnerability_intelligence/

EXTENDED DESCRIPTION:
Further details available in Customer Area:
http://secunia.com/vulnerability_intelligence/

EXTENDED SOLUTION:
Further details available in Customer Area:
http://secunia.com/vulnerability_intelligence/

EXPLOIT:
Further details available in Customer Area:
http://secunia.com/vulnerability_intelligence/

----------------------------------------------------------------------

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

Subscribe:
http://secunia.com/advisories/secunia_security_advisories/

Definitions: (Criticality, Where etc.)
http://secunia.com/advisories/about_secunia_advisories/


Please Note:
Secunia recommends that you verify all advisories you receive by
clicking the link.
Secunia NEVER sends attached files with advisories.
Secunia does not advise people to install third party patches, only
use those supplied by the vendor.

----------------------------------------------------------------------

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