SB2012120703 - Input validation error in libssh (Alpine package)
Published: December 7, 2012
Security Bulletin ID
SB2012120703
CSH Severity
Medium
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Remote access
Highest impact
Partial DoS
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 vulnerability.
1) Input validation error (CVE-ID: CVE-2012-4561)
CWE-ID: CWE-20 - Improper input validation
CVSSv4: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:U/U:Green
The vulnerability allows a remote non-authenticated attacker to perform service disruption.
The (1) publickey_make_dss, (2) publickey_make_rsa, (3) signature_from_string, (4) ssh_do_sign, and (5) ssh_sign_session_id functions in keys.c in libssh before 0.5.3 free "an invalid pointer on an error path," which might allow remote attackers to cause a denial of service (crash) 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