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.
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TITLE:
Ubuntu update for libssh
SECUNIA ADVISORY ID:
SA51407
VERIFY ADVISORY:
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RELEASE DATE:
2012-11-27
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http://secunia.com/advisories/51407/
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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:
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http://secunia.com/vulnerability_intelligence/
DEEP LINKS:
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EXTENDED DESCRIPTION:
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EXTENDED SOLUTION:
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EXPLOIT:
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