SB2019030121 - Security restrictions bypass in openssh (Alpine package)
Published: March 1, 2019
Security Bulletin ID
SB2019030121
Severity
Low
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) Security restrictions bypass (CVE-ID: CVE-2019-6111)
The vulnerability allows a remote attacker to bypass security restrictions on the target system.The weakness exists due to missing received object name validation by the scp client. A malicious SCP server can overwrite arbitrary files in the SCP client target directory. If a recursive operation (-r) is performed, the server can manipulate subdirectories as well (for example overwrite .ssh/authorized_keys).
Remediation
Install update from vendor's website.
References
- https://git.alpinelinux.org/aports/commit/?id=07fc0a9367151053d9b6e8ab68fdb3c7501a4873
- https://git.alpinelinux.org/aports/commit/?id=cfa04666c50b8dfbe34b6ac8e6b177add54ce649
- https://git.alpinelinux.org/aports/commit/?id=12d219e7e12c5bdf2e11ba8e9f10d32843259777
- https://git.alpinelinux.org/aports/commit/?id=6df59aea4486cca6f0c089f72e404ee097b49a02
- https://git.alpinelinux.org/aports/commit/?id=9730fd967a164b246d18cab2dede31af43c83f08
- https://git.alpinelinux.org/aports/commit/?id=e231e6bed510c2304f37093f0eadb5708da9728e