Comments (1)
Changes in librsync 1.0.0 (2015-01-23)
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SECURITY: CVE-2014-8242: librsync previously used a truncated MD4
"strong" check sum to match blocks. However, MD4 is not cryptographically
strong. It's possible that an attacker who can control the contents of one
part of a file could use it to control other regions of the file, if it's
transferred using librsync/rdiff. For example this might occur in a
database, mailbox, or VM image containing some attacker-controlled data.To mitigate this issue, signatures will by default be computed with a
256-bit BLAKE2 hash. Old versions of librsync will complain about a
bad magic number when given these signature files.Backward compatibility can be obtained using the new
rdiff sig --hash=md4
option or through specifying the "signature magic" in the API, but
this should not be used when either the old or new file contain
untrusted data.Deltas generated from those signatures will also use BLAKE2 during
generation, but produce output that can be read by old versions.Thanks to Michael Samuel <miknet.net> for reporting this and offering an
initial patch.
from python-librsync.
Related Issues (10)
- AttributeError: 'unicode' object has no attribute 'read' HOT 3
- Pypi version is seriously broken
- librsync 2.0.0 compatibility HOT 2
- ImportError: Could not load librsync, make sure it is installed
- filesize limit of 4MB HOT 2
- "Unexplained problem" while patching HOT 1
- redundant read in patch/read_cb HOT 1
- the behavior of compare and patch file of the same?
- Does this work recursively? HOT 2
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