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Bug #9995

openssh: Multiple vulnerabilities (CVE-2018-20685, CVE-2019-6109, CVE-2019-6111)

Added by Alicha CH 3 months ago. Updated 3 months ago.

Status:
Closed
Priority:
Normal
Assignee:
Category:
Security
Target version:
-
Start date:
02/20/2019
Due date:
% Done:

100%

Estimated time:
(Total: 0.00 h)
Affected versions:
Security IDs:
CVE-2018-20685, CVE-2019-6109, CVE-2019-6111

Description

CVE-2018-20685: In OpenSSH 7.9, scp.c in the scp client allows remote SSH servers to bypass intended access restrictions via the
filename of . or an empty filename. The impact is modifying the permissions of the target directory on the client side.

References:

https://nvd.nist.gov/vuln/detail/CVE-2018-20685
https://marc.info/?l=oss-security&m=154745764812881&w=2

Patch:

https://github.com/openssh/openssh-portable/commit/6010c0303a422a9c5fa8860c061bf7105eb7f8b2

CVE-2019-6109: An issue was discovered in OpenSSH 7.9. Due to missing character encoding in the progress display, a malicious server (or Man-in-The-Middle attacker) can employ crafted object names to manipulate the client output, e.g., by using ANSI control codes to hide additional files being transferred. This affects refresh_progress_meter() in progressmeter.c.

References:

https://nvd.nist.gov/vuln/detail/CVE-2019-6109
https://sintonen.fi/advisories/scp-client-multiple-vulnerabilities.txt

Patch:

https://github.com/openssh/openssh-portable/commit/8976f1c4b2721c26e878151f52bdf346dfe2d54c
possibly additionally needed: https://github.com/openssh/openssh-portable/commit/bdc6c63c80b55bcbaa66b5fde31c1cb1d09a41eb

CVE-2019-6111: An issue was discovered in OpenSSH 7.9. Due to the scp implementation being derived from 1983 rcp, the server chooses which files/directories are sent to the client. However, the scp client only performs cursory validation of the object name returned (only directory traversal attacks are prevented). A malicious scp server (or Man-in-The-Middle attacker) can overwrite arbitrary files in the scp client target directory. If recursive operation (-r) is performed, the server can manipulate subdirectories as well (for example, to overwrite the .ssh/authorized_keys file).

References:

https://nvd.nist.gov/vuln/detail/CVE-2019-6111

Patch:

https://github.com/openssh/openssh-portable/commit/391ffc4b9d31fa1f4ad566499fef9176ff8a07dc


Subtasks

Bug #9996: [3.10] openssh: Multiple vulnerabilities (CVE-2018-20685, CVE-2019-6109, CVE-2019-6111)ClosedNatanael Copa

Bug #9997: [3.9] openssh: Multiple vulnerabilities (CVE-2018-20685, CVE-2019-6109, CVE-2019-6111)ClosedNatanael Copa

Bug #9998: [3.8] openssh: Multiple vulnerabilities (CVE-2018-20685, CVE-2019-6109, CVE-2019-6111)ClosedNatanael Copa

Bug #9999: [3.7] openssh: Multiple vulnerabilities (CVE-2018-20685, CVE-2019-6109, CVE-2019-6111)ClosedNatanael Copa

Bug #10000: [3.6] openssh: Multiple vulnerabilities (CVE-2018-20685, CVE-2019-6109, CVE-2019-6111)ClosedNatanael Copa

History

#1 Updated by Leonardo Arena 3 months ago

  • Status changed from New to Resolved

#2 Updated by Alicha CH 3 months ago

  • Project changed from Alpine Security to Alpine Linux
  • Category set to Security
  • Status changed from Resolved to Closed

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