CVE-2023-27535

NameCVE-2023-27535
DescriptionAn authentication bypass vulnerability exists in libcurl <8.0.0 in the FTP connection reuse feature that can result in wrong credentials being used during subsequent transfers. Previously created connections are kept in a connection pool for reuse if they match the current setup. However, certain FTP settings such as CURLOPT_FTP_ACCOUNT, CURLOPT_FTP_ALTERNATIVE_TO_USER, CURLOPT_FTP_SSL_CCC, and CURLOPT_USE_SSL were not included in the configuration match checks, causing them to match too easily. This could lead to libcurl using the wrong credentials when performing a transfer, potentially allowing unauthorized access to sensitive information.
SourceCVE (at NVD; CERT, LWN, oss-sec, fulldisc, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more)
ReferencesDLA-3398-1, ELA-831-1

Vulnerable and fixed packages

The table below lists information on source packages.

Source PackageReleaseVersionStatus
curl (PTS)jessie, jessie (lts)7.38.0-4+deb8u28fixed
stretch (security)7.52.1-5+deb9u16vulnerable
stretch (lts), stretch7.52.1-5+deb9u22fixed
buster, buster (lts)7.64.0-4+deb10u10fixed
buster (security)7.64.0-4+deb10u9fixed
bullseye7.74.0-1.3+deb11u13fixed
bullseye (security)7.74.0-1.3+deb11u14fixed
bookworm7.88.1-10+deb12u8fixed
bookworm (security)7.88.1-10+deb12u5fixed
sid, trixie8.11.1-1fixed

The information below is based on the following data on fixed versions.

PackageTypeReleaseFixed VersionUrgencyOriginDebian Bugs
curlsourcejessie7.38.0-4+deb8u26ELA-831-1
curlsourcestretch7.52.1-5+deb9u19ELA-831-1
curlsourcebuster7.64.0-4+deb10u6DLA-3398-1
curlsourcebullseye7.74.0-1.3+deb11u8
curlsource(unstable)7.88.1-7

Notes

https://curl.se/docs/CVE-2023-27535.html
Introduced by: https://github.com/curl/curl/commit/177dbc7be07125582ddb7416dba7140b88ab9f62 (curl-7_13_0)
Fixed by: https://github.com/curl/curl/commit/8f4608468b890dce2dad9f91d5607ee7e9c1aba1 (curl-8_0_0)

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