CVE-2016-10009

Untrusted search path vulnerability in ssh-agent.c in ssh-agent in OpenSSH before 7.4 allows remote attackers to execute arbitrary local PKCS#11 modules by leveraging control over a forwarded agent-socket.

Untrusted search path vulnerability in ssh-agent.c in ssh-agent in OpenSSH before 7.4 allows remote attackers to execute arbitrary local PKCS#11 modules by leveraging control over a forwarded agent-socket.

Untrusted search path vulnerability in ssh-agent.c in ssh-agent in OpenSSH before 7.4 allows remote attackers to execute arbitrary local PKCS#11 modules by leveraging control over a forwarded agent-socket.

• CVE-2016-10009: add whitelist of paths which may ssh-agent load from in order to prevent execution of arbitrary local pkcs#11

• CVE-2016-10009: add whitelist of paths which may ssh-agent load from in order to prevent execution of arbitrary local pkcs#11

These are all security issues fixed in the openssh-8.4p1-7.4 package on the GA media of openSUSE Tumbleweed.

This update for openssh fixes several issues.

These security issues were fixed:

• CVE-2016-8858: The kex_input_kexinit function in kex.c allowed remote attackers to cause a denial of service (memory consumption) by sending many duplicate KEXINIT requests (bsc#1005480).
• CVE-2016-10012: The shared memory manager (associated with pre-authentication compression) did not ensure that a bounds check is enforced by all compilers, which might allowed local users to gain privileges by leveraging access to a sandboxed privilege-separation process, related to the m_zback and m_zlib data structures (bsc#1016370).
• CVE-2016-10009: Untrusted search path vulnerability in ssh-agent.c allowed remote attackers to execute arbitrary local PKCS#11 modules by leveraging control over a forwarded agent-socket (bsc#1016366).
• CVE-2016-10010: When forwarding unix domain sockets with privilege separation disabled, the resulting sockets have be created as 'root' instead of the authenticated user. Forwarding unix domain sockets without privilege separation enabled is now rejected.
• CVE-2016-10011: authfile.c in sshd did not properly consider the effects of realloc on buffer contents, which might allowed local users to obtain sensitive private-key information by leveraging access to a privilege-separated child process (bsc#1016369).

These non-security issues were fixed:

• Adjusted suggested command for removing conflicting server keys from the known_hosts file (bsc#1006221)
• Properly verify CIDR masks in configuration (bsc#1005893)

This update for openssh fixes the following issues:

Security issues fixed:

• CVE-2016-8858: prevent resource depletion during key exchange (bsc#1005480)
• CVE-2016-10009: limit directories for loading PKCS11 modules to avoid privilege escalation (bsc#1016366)
• CVE-2016-10011: Prevent possible leaks of host private keys to low-privilege process handling authentication (bsc#1016369)

Non security issues fixed:

• Properly verify CIDR masks in the AllowUsers and DenyUsers configuration lists (bsc#1005893)
• fix suggested command for removing conflicting server keys from the known_hosts file (bsc#1006221)

This update for openssh fixes the following issues:

Security issues fixed:

• CVE-2016-8858: prevent resource depletion during key exchange (bsc#1005480)
• CVE-2016-10009: limit directories for loading PKCS11 modules to avoid privilege escalation (bsc#1016366)
• CVE-2016-10011: Prevent possible leaks of host private keys to low-privilege process handling authentication (bsc#1016369)

Non security issues fixed:

• Properly verify CIDR masks in the AllowUsers and DenyUsers configuration lists (bsc#1005893)

This update for openssh fixes the following issues:

• CVE-2016-8858: prevent resource depletion during key exchange (bsc#1005480)

• CVE-2016-10009: limit directories for loading PKCS11 modules to avoid privilege escalation (bsc#1016366)

• CVE-2016-10011: Prevent possible leaks of host private keys to low-privilege process handling authentication (bsc#1016369)

• Fix suggested command for removing conflicting server keys from the known_hosts file (bsc#1006221)

• Properly verify CIDR masks in the AllowUsers and DenyUsers configuration lists (bsc#1005893)

This update for openssh fixes the following issues:

• CVE-2016-8858: prevent resource depletion during key exchange (bsc#1005480)

• CVE-2016-10009: limit directories for loading PKCS11 modules to avoid privilege escalation (bsc#1016366)

• CVE-2016-10011: Prevent possible leaks of host private keys to low-privilege process handling authentication (bsc#1016369)

• Fix suggested command for removing conflicting server keys from the known_hosts file (bsc#1006221)

• Properly verify CIDR masks in the AllowUsers and DenyUsers configuration lists (bsc#1005893)

This update for openssh fixes the following issues:

• CVE-2016-8858: prevent resource depletion during key exchange (bsc#1005480)

• CVE-2016-10009: limit directories for loading PKCS11 modules to avoid privilege escalation (bsc#1016366)

• CVE-2016-10011: Prevent possible leaks of host private keys to low-privilege process handling authentication (bsc#1016369)

• Fix suggested command for removing conflicting server keys from the known_hosts file (bsc#1006221)

• Properly verify CIDR masks in the AllowUsers and DenyUsers configuration lists (bsc#1005893)

This update for openssh-openssl1 fixes the following issues:

• Properly verify CIDR masks in configuration (bsc#1005893)

• CVE-2016-10009: limit directories for loading PKCS11 modules (bsc#1016366)

• CVE-2016-10011: Prevent possible leaks of host private keys to low-privilege process handling authentication (bsc#1016369)

• CVE-2016-8858: prevent resource depletion during key exchange (bsc#1005480)

• fix suggested command for removing conflicting server keys from the known_hosts file (bsc#1006221)

Jann Horn discovered that OpenSSH incorrectly loaded PKCS#11 modules from untrusted directories. A remote attacker could possibly use this issue to execute arbitrary PKCS#11 modules. This issue only affected Ubuntu 14.04 LTS and Ubuntu 16.04 LTS. (CVE-2016-10009)

Jann Horn discovered that OpenSSH incorrectly handled permissions on Unix-domain sockets when privilege separation is disabled. A local attacker could possibly use this issue to gain privileges. This issue only affected Ubuntu 16.04 LTS. (CVE-2016-10010)

Jann Horn discovered that OpenSSH incorrectly handled certain buffer memory operations. A local attacker could possibly use this issue to obtain sensitive information. This issue only affected Ubuntu 14.04 LTS and Ubuntu 16.04 LTS. (CVE-2016-10011)

Guido Vranken discovered that OpenSSH incorrectly handled certain shared memory manager operations. A local attacker could possibly use issue to gain privileges. This issue only affected Ubuntu 14.04 LTS and Ubuntu 16.04 LTS. This issue only affected Ubuntu 14.04 LTS and Ubuntu 16.04 LTS. (CVE-2016-10012)

Michal Zalewski discovered that OpenSSH incorrectly prevented write operations in readonly mode. A remote attacker could possibly use this issue to create zero-length files, leading to a denial of service. (CVE-2017-15906)