hckrnws

The fact that ZIP files include the catalog/directory at the end is such nostalgia fever. Back in the day it meant that if you naïvely downloaded the file, a partial download would be totally useless. Fortunately, in the early 2000s, we got HTTP's Range and a bunch of zip-aware downloaders that would fetch the catalog first so that you could preview a zip you were downloading and even extract part of a file! Good times. Well, not as good as now, but amusing to think of today.

> ... a partial download would be totally useless ...

no, not totally. The directory at the end of the archive points backwards to local headers, which in turn include all the necessary information, e.g. the compressed size inside the archive, compression method, the filename and even a checksum.

If the archive isn't some recursive/polyglot nonsense as in the article, it's essentially just a tightly packed list of compressed blobs, each with a neat, local header in front (that even includes a magic number!), the directory at the end is really just for quick access.

If your extraction program supports it (or you are sufficiently motivated to cobble together a small C program with zlib....), you can salvage what you have by linearly scanning and extracting the archive, somewhat like a fancy tarball.

At work, our daily build (actually 4x per day) is a handful of zip files totaling some 7GB. The script to get the build would copy the archives over the network, then decompress then into your install directory.

This works great on campus, but when everyone went remote during COVID it wasn't anymore. It went from three minutes to like twenty minutes.

However. Most files change only rarely. I don't need all the files, just the ones which are different. So I wrote a scanner thing which compares the zip file's filesize and checksum to the checksum of the local file. If they're the same, we skip it, otherwise, we decompress out of the zip file. This cut the time to get the daily build from 20 minutes to 4 minutes.

Obviously this isn't resilient to an attacker, crc32 is not secure, but as an internal tool it's awesome.

Partial zip shouldn't be totally useless and a good unzip tool should be able to repair such partial downloads. In addition to catalog at end zip also have local headers before each file entry. So unless you are dealing with maliciously crafted zip file or zip file combined with something else, parsing it from start should produce identical result. Some zip parsers even default to sequential parsing behavior.

This redundant information has lead to multiple vulnerabilities over the years. As having redundant information means that a maliciously crafted zip file with conflicting headers can have 2 different interpretations when processed by 2 different parsers.

Partial downloads weren't useless, though, as other commenters have said.

The PKZIP tools came with PKZIPFIX.EXE, which would scan the file from the beginning and rebuild a missing central archive. You could extract any files up to the truncated file where your download stopped.

Well what do you want it to do, it doesn't know full directory with offsets until it's done compressing and dispersed directory would have lousy access pattern for quick listing. And you know, if you are compressing you probably want the smallest file so duplicate directories are not idea.

Debian's `unzip` utility, which is based off of Info-ZIP but with a number of patches, errors out on overlapping files, though not before making a 21 MB file named `0` - presumably the only non-overlapping file.

    unzip zbsm.zip
    Archive:  zbsm.zip
      inflating: 0
    error: invalid zip file with overlapped components (possible zip bomb)

https://sources.debian.org/patches/unzip/6.0-29/23-cve-2019-...

Yep, these kinds of format shenanigans are increasingly rejected for security reasons. Not zip bombs specifically, but to prevent parser mismatch vulnerabilities (i.e. two parser implementations decompressing the same zip file to different contents, without reporting an error).

I wonder if there's any reverse zip-bombs? e.g. A realy big .zip file, takes long time to unzip, but get only few bytes of content.

Like bomb the CPU time instead of memory.

Trivially. Zip file headers specify where the data is. All other bytes are ignored.

That's how self extraction archives and installers work and are also valid zip files. The extractor part is just a regular executable that is a zip decompresser that decompresses itself.

This is specific to zip files, not the deflate algorithm.

That would be a big zip file, but would not take a long time to unzip.

Isn't that mathematically impossible?

Why's that? I'm not really sure how DEFLATE works but I can imagine a crappy compression that's like "5 0" means "00000". So if you try to compress "0" you get "1 0" which is longer than the input. In fact, I bet this is true for any well-compressed format. Like zipping a JpegXL image will probably yield something larger. Much larger.. I don't know how you do that.

Previously discussed in 2019, https://news.ycombinator.com/item?id=20352439

Someone shared a link to that site in a conversation earlier this year on HN. For a long time now, I've had a gzip bomb sitting on my server that I provide to people that make a certain categories of malicious calls, such as attempts to log in to wordpress, on a site not using wordpress. That post got me thinking about alternative types of bombs, particularly as newer compression standards have become ubiquitous, and supported in browsers and http clients.

I spent some time experimenting with brotli as a compression bomb to serve to malicious actors: https://paulgraydon.co.uk/posts/2025-07-28-compression-bomb/

Unfortunately, as best as I can see, malicious actors are all using clients that only accept gzip, rather than brotli'd contents, and I'm the only one to have ever triggered the bomb when I was doing the initial setup!

In one of my previous jobs, I got laid off in the most condescending way, only to be asked days later by my former boss to send her some documents. If only I knew about this then...

You have bigger enemies more worthy of that personal risk. This comment bewilders me a bit.

Don't commit felonies because you're unhappy with your former employer.

Is it a felony to crash someone's computer?

If it causes more than $5k in damage. Otherwise, it's a misdemeanor.

But you probably don't want to be investigated for either.

Violations of the Computer Fraud and Abuse Act (CFAA) can be either misdemeanors or felonies. It's definitely broad enough that doing so could get you in serious trouble if pursued.

Possibly, yes.

If done deliberately…

Decompression is equivalent to executing code for a specialized virtual machine. It should be possible to automate this process of finding "small" programs that generate "large" outputs. Could even be an interesting AI benchmark.

My guess is this is a subset of the halting problem (does this program accept data with non-halting decompression), and is therefore beautifully undecidable. You are free to leave zip/tgz/whatever fork bombs as little mines for live-off-the-land advanced persistent threats in your filesystems.

it's not. decompression always ends since it progresses through the stream always moving forward. but it might take a while

Okay, so I know back in the day you could choke scanning software (ie email attachment scanners) by throwing a zip bomb into them. I believe the software has gotten smarter these days so it won’t simply crash when that happens - but how is this done; How does one detect a zip bomb?

I don't understand the code itself, but here's Debian's patch to detect overlapping zip bombs in `unzip`:

https://sources.debian.org/patches/unzip/6.0-29/23-cve-2019-...

    The detection maintains a list of covered spans of the zip files
    so far, where the central directory to the end of the file and any
    bytes preceding the first entry at zip file offset zero are
    considered covered initially. Then as each entry is decompressed
    or tested, it is considered covered. When a new entry is about to
    be processed, its initial offset is checked to see if it is
    contained by a covered span. If so, the zip file is rejected as
    invalid.

For any compression algorithm in general, you keep track of A = {uncompressed bytes processed} and B = {compressed bytes processed} while decompressing, and bail out when either of the following occur:

1. A exceeds some unreasonable threshold

2. A/B exceeds some unreasonable threshold

Embarrsingly simple for a scanner too as you just mark as suspicious when this happens. You can be wrong sometimes and this is expected

(2019) with last update in 2023.

Is it possible to implement something similar but with a protocol that supports compression? Can we have a zip bomb but with a compressed http response that gets decompressed on the client? There are many protocols that support compression in some way.

Previously: I use zip bombs to protect my server (idiallo.com) 1076 points https://news.ycombinator.com/item?id=43826798

There was https://idiallo.com/blog/zipbomb-protection earlier this year. It sends highly compressed output of /dev/zero. No overlapping files or recursively compressed payloads.