PT-2021-9086 · Git+19 · Krb5-Appl
Karol Babioch
·
Published
2021-02-02
·
Updated
2021-07-21
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CVE-2019-25018
CVSS v3.1
7.5
High
| Vector | AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N |
An issue was discovered in rcp in MIT krb5-appl through 1.0.3. Due to the rcp
implementation being derived from 1983 rcp, the server chooses which
files/directories are sent to the client. However, the rcp client only
performs cursory validation of the object name returned (only directory
traversal attacks are prevented). A malicious rcp server (or
Man-in-The-Middle attacker) can overwrite arbitrary files in the rcp 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). This issue is similar to CVE-2019-6111 and
CVE-2019-7283 (CVE-2019-25017).
In the rcp client in MIT krb5-appl through 1.0.3 malicious servers could
bypass intended access restrictions via the filename of . or an empty
filename, similar to CVE-2018-20685 and CVE-2019-7282. The impact is modifying
the permissions of the target directory on the client side (CVE-2019-25018).
Exploit
Fix
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Related Identifiers
Affected Products
Krb5-Appl