The canonicalize_username function in svnserve/cyrus_auth.c in Apache Subversion before 1.8.16 and 1.9.x before 1.9.4, when Cyrus SASL authentication is used, allows remote attackers to authenticate and bypass intended access restrictions via a realm string that is a prefix of an expected repository realm string.

• http://mail-archives.apache.org/mod_mbox/subversion-announce/201604.mbox/%3CCAP_GPNgJet+7_MAhomFVOXPgLtewcUw9w=k9zdPCkq5tvPxVMA@mail.gmail.com%3E
• http://www.debian.org/security/2016/dsa-3561
• http://www.securitytracker.com/id/1035706
• http://mail-archives.apache.org/mod_mbox/subversion-announce/201604.mbox/%3CCAP_GPNgfn1iKueW51EpmXzXi_URNfGNofZSgOyW1_jnSeNm5DQ@mail.gmail.com%3E
• http://subversion.apache.org/security/CVE-2016-2167-advisory.txt
• http://www.securityfocus.com/bid/89417
• http://www.slackware.com/security/viewer.php?l=slackware-security&y=2016&m=slackware-security.417496
• http://lists.opensuse.org/opensuse-updates/2016-05/msg00044.html
• http://lists.opensuse.org/opensuse-updates/2016-05/msg00043.html
• http://lists.fedoraproject.org/pipermail/package-announce/2016-May/184545.html
• https://security.gentoo.org/glsa/201610-05
• https://www.oracle.com/security-alerts/cpuoct2020.html

The req_check_access function in the mod_authz_svn module in the httpd server in Apache Subversion before 1.8.16 and 1.9.x before 1.9.4 allows remote authenticated users to cause a denial of service (NULL pointer dereference and crash) via a crafted header in a (1) MOVE or (2) COPY request, involving an authorization check.

• http://mail-archives.apache.org/mod_mbox/subversion-announce/201604.mbox/%3CCAP_GPNgJet+7_MAhomFVOXPgLtewcUw9w=k9zdPCkq5tvPxVMA@mail.gmail.com%3E
• http://www.debian.org/security/2016/dsa-3561
• http://subversion.apache.org/security/CVE-2016-2168-advisory.txt
• http://mail-archives.apache.org/mod_mbox/subversion-announce/201604.mbox/%3CCAP_GPNgfn1iKueW51EpmXzXi_URNfGNofZSgOyW1_jnSeNm5DQ@mail.gmail.com%3E
• http://www.securitytracker.com/id/1035707
• http://www.securityfocus.com/bid/89320
• http://www.slackware.com/security/viewer.php?l=slackware-security&y=2016&m=slackware-security.417496
• http://lists.opensuse.org/opensuse-updates/2016-05/msg00044.html
• http://lists.opensuse.org/opensuse-updates/2016-05/msg00043.html
• http://lists.fedoraproject.org/pipermail/package-announce/2016-May/184545.html
• https://security.gentoo.org/glsa/201610-05
• https://www.oracle.com/security-alerts/cpuoct2020.html

A maliciously constructed svn+ssh:// URL would cause Subversion clients before 1.8.19, 1.9.x before 1.9.7, and 1.10.0.x through 1.10.0-alpha3 to run an arbitrary shell command. Such a URL could be generated by a malicious server, by a malicious user committing to a honest server (to attack another user of that server's repositories), or by a proxy server. The vulnerability affects all clients, including those that use file://, http://, and plain (untunneled) svn://.

• https://subversion.apache.org/security/CVE-2017-9800-advisory.txt
• https://lists.apache.org/thread.html/cb607dc2f13bab9769147759ddccb14a4f9d8e5cdcad5e99c0d03b63@%3Cannounce.apache.org%3E
• http://www.securitytracker.com/id/1039127
• http://www.securityfocus.com/bid/100259
• https://confluence.atlassian.com/sourcetreekb/sourcetree-security-advisory-2017-08-11-933099891.html
• http://packetstormsecurity.com/files/143722/Apache-Subversion-Arbitrary-Code-Execution.html
• https://security.gentoo.org/glsa/201709-09
• https://support.apple.com/HT208103
• http://www.debian.org/security/2017/dsa-3932
• https://access.redhat.com/errata/RHSA-2017:2480
• http://www.securityfocus.com/archive/1/540999/100/0/threaded
• https://lists.apache.org/thread.html/d8cf53affd700dfce90bad4968fb8b1dfb69cf7c443052c70398ff76@%3Ccommits.subversion.apache.org%3E
• https://www.oracle.com/security-alerts/cpuoct2020.html