SB2019031914 - Out-of-bounds read in libssh2 (Alpine package)
Published: March 19, 2019
Security Bulletin ID
SB2019031914
Severity
Medium
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Remote access
Highest impact
Denial of service
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 security vulnerability.
1) Out-of-bounds read (CVE-ID: CVE-2019-3862)
The vulnerability allows a remote attacker to gain access to potentially sensitive information or perform denial of service (DoS) attack.
The vulnerability exists due to a boundary condition when SSH_MSG_CHANNEL_REQUEST packets with an exit status message and no payload are parsed. A remote attacker can trick the victim to connect to a malicious SSH server, trigger out of bounds read and gain access to sensitive information or perform denial of service attack.
Remediation
Install update from vendor's website.
References
- https://git.alpinelinux.org/aports/commit/?id=d60ef1f3b3cd3b40d41722b7de616227c0b83a2b
- https://git.alpinelinux.org/aports/commit/?id=eec223036af35046c74baca7b09d6a81aaccbe86
- https://git.alpinelinux.org/aports/commit/?id=0c38351d5beace23bc498ea5fc79b3ba6a012b6e
- https://git.alpinelinux.org/aports/commit/?id=27f813a2ece1924d1c8f2e02239ad214611599fb
- https://git.alpinelinux.org/aports/commit/?id=4f69ccce51fcfa18af42948e79d26c5d0ba42733