SB2012120702 - Resource management error in libssh (Alpine package)
Published: December 7, 2012
Security Bulletin ID
SB2012120702
Severity
Medium
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Remote access
Highest impact
Data manipulation
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 security vulnerability.
1) Resource management error (CVE-ID: CVE-2012-4559)
The vulnerability allows a remote non-authenticated attacker to read and manipulate data.
Multiple double free vulnerabilities in the (1) agent_sign_data function in agent.c, (2) channel_request function in channels.c, (3) ssh_userauth_pubkey function in auth.c, (4) sftp_parse_attr_3 function in sftp.c, and (5) try_publickey_from_file function in keyfiles.c in libssh before 0.5.3 allow remote attackers to cause a denial of service (crash) and possibly execute arbitrary code via unspecified vectors.
Remediation
Install update from vendor's website.
References
- https://git.alpinelinux.org/aports/commit/?id=3aa8dade2d1f5f2305e19a6b358c2387cad1e44e
- https://git.alpinelinux.org/aports/commit/?id=64fa42e2bc50a87954e1da1bc1b7d046a3f8a3e0
- https://git.alpinelinux.org/aports/commit/?id=83c66142a67d9bcd991f2e6336e51ec8c190ceb6
- https://git.alpinelinux.org/aports/commit/?id=105ad95e86f1c3023bbff961a80bbce2265ef164