Debian Security Advisory

DLA-1414-1 mercurial -- LTS security update

Date Reported:

05 Jul 2018

Affected Packages:

Vulnerable:

Yes

Security database references:

In the Debian bugtracking system: Bug 861243, Bug 892964, Bug 901050.
In Mitre's CVE dictionary: CVE-2017-9462, CVE-2017-17458, CVE-2018-1000132.

More information:

Some security vulnerabilities were found in Mercurial which allow authenticated users to trigger arbitrary code execution and unauthorized data access in certain server configuration. Malformed patches and repositories can also lead to crashes and arbitrary code execution on clients.

CVE-2017-9462
In Mercurial before 4.1.3, "hg serve --stdio" allows remote authenticated users to launch the Python debugger, and consequently execute arbitrary code, by using --debugger as a repository name.
CVE-2017-17458
In Mercurial before 4.4.1, it is possible that a specially malformed repository can cause Git subrepositories to run arbitrary code in the form of a .git/hooks/post-update script checked into the repository. Typical use of Mercurial prevents construction of such repositories, but they can be created programmatically.
CVE-2018-1000132
Mercurial version 4.5 and earlier contains a Incorrect Access Control (CWE-285) vulnerability in Protocol server that can result in Unauthorized data access. This attack appear to be exploitable via network connectivity. This vulnerability appears to have been fixed in 4.5.1.
OVE-20180430-0001
mpatch: be more careful about parsing binary patch data
OVE-20180430-0002
mpatch: protect against underflow in mpatch_apply
OVE-20180430-0004
mpatch: ensure fragment start isn't past the end of orig

For Debian 8 Jessie, these problems have been fixed in version 3.1.2-2+deb8u5.

We recommend that you upgrade your mercurial packages.

Further information about Debian LTS security advisories, how to apply these updates to your system and frequently asked questions can be found at: https://wiki.debian.org/LTS