cbcvebase.
CVE-2017-1000254
published 2017-10-06

CVE-2017-1000254: libcurl may read outside of a heap allocated buffer when doing FTP. When libcurl connects to an FTP server and successfully logs in (anonymous or not), it asks…

PriorityP338high7.5CVSS 3.0
AVNACLPRNUINSUCNINAH
EPSS
1.32%
80.4th percentile
libcurl may read outside of a heap allocated buffer when doing FTP. When libcurl connects to an FTP server and successfully logs in (anonymous or not), it asks the server for the current directory with the `PWD` command. The server then responds with a 257 response containing the path, inside double quotes. The returned path name is then kept by libcurl for subsequent uses. Due to a flaw in the string parser for this directory name, a directory name passed like this but without a closing double quote would lead to libcurl not adding a trailing NUL byte to the buffer holding the name. When libcurl would then later access the string, it could read beyond the allocated heap buffer and crash or wrongly access data beyond the buffer, thinking it was part of the path. A malicious server could abuse this fact and effectively prevent libcurl-based clients to work with it - the PWD command is always issued on new FTP connections and the mistake has a high chance of causing a segfault. The simple fact that this has issue remained undiscovered for this long could suggest that malformed PWD responses are rare in benign servers. We are not aware of any exploit of this flaw. This bug was introduced in commit [415d2e7cb7](https://github.com/curl/curl/commit/415d2e7cb7), March 2005. In libcurl version 7.56.0, the parser always zero terminates the string but also rejects it if not terminated properly with a final double quote.

Affected

125 ranges· showing 25
VendorProductVersion rangeFixed in
applemacos_high_sierra_10.13.2_security_update_2017-002_sierra_and_security_update_20
debiancurl< curl 7.56.1-1 (bookworm)curl 7.56.1-1 (bookworm)
haxxcurl>= 0 < 7.56.1-17.56.1-1
haxxcurl>= 0 < 7.56.1-17.56.1-1
haxxcurl>= 0 < 7.56.1-17.56.1-1
haxxcurl>= 0 < 7.56.1-17.56.1-1
haxxcurl>= 0 < 7.35.0-1ubuntu2.117.35.0-1ubuntu2.11
haxxcurl>= 0 < 7.47.0-1ubuntu2.37.47.0-1ubuntu2.3
haxxlibcurl
haxxlibcurl
haxxlibcurl
haxxlibcurl
haxxlibcurl
haxxlibcurl
haxxlibcurl
haxxlibcurl
haxxlibcurl
haxxlibcurl
haxxlibcurl
haxxlibcurl
haxxlibcurl
haxxlibcurl
haxxlibcurl
haxxlibcurl
haxxlibcurl

CVSS provenance

nvdv3.07.5HIGHCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
nvdv2.05.0MEDIUMAV:N/AC:L/Au:N/C:N/I:N/A:P
osv8.1HIGH
vendor_debian7.5HIGH
vendor_redhat7.5HIGH
vendor_ubuntu5.9MEDIUM
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