Is this a zip encryption bug?

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13














I have recently discovered an exploit, where I(or assuming anyone) can re-encrypt my encrypted zip file without having to know the password:



#zip --encrypt encrypted.zip -r dir1/



The above will prompt the user to enter a new password. Is there something I'm missing, or is this a known issue?










share|improve this question

















  • 5




    Have you found a way to read the data in the original zip file?
    – ctrl-alt-delor
    Dec 18 at 20:24










  • @ctrl-alt-delor yes I didn't forget my password, I realised this by accident
    – lamino
    Dec 18 at 20:40






  • 16




    Sorry I meant, Have you found a way to read the data in the original zip file, without knowing the password?
    – ctrl-alt-delor
    Dec 18 at 20:53















13














I have recently discovered an exploit, where I(or assuming anyone) can re-encrypt my encrypted zip file without having to know the password:



#zip --encrypt encrypted.zip -r dir1/



The above will prompt the user to enter a new password. Is there something I'm missing, or is this a known issue?










share|improve this question

















  • 5




    Have you found a way to read the data in the original zip file?
    – ctrl-alt-delor
    Dec 18 at 20:24










  • @ctrl-alt-delor yes I didn't forget my password, I realised this by accident
    – lamino
    Dec 18 at 20:40






  • 16




    Sorry I meant, Have you found a way to read the data in the original zip file, without knowing the password?
    – ctrl-alt-delor
    Dec 18 at 20:53













13












13








13


6





I have recently discovered an exploit, where I(or assuming anyone) can re-encrypt my encrypted zip file without having to know the password:



#zip --encrypt encrypted.zip -r dir1/



The above will prompt the user to enter a new password. Is there something I'm missing, or is this a known issue?










share|improve this question













I have recently discovered an exploit, where I(or assuming anyone) can re-encrypt my encrypted zip file without having to know the password:



#zip --encrypt encrypted.zip -r dir1/



The above will prompt the user to enter a new password. Is there something I'm missing, or is this a known issue?







encryption zip






share|improve this question













share|improve this question











share|improve this question




share|improve this question










asked Dec 18 at 19:42









lamino

7415




7415







  • 5




    Have you found a way to read the data in the original zip file?
    – ctrl-alt-delor
    Dec 18 at 20:24










  • @ctrl-alt-delor yes I didn't forget my password, I realised this by accident
    – lamino
    Dec 18 at 20:40






  • 16




    Sorry I meant, Have you found a way to read the data in the original zip file, without knowing the password?
    – ctrl-alt-delor
    Dec 18 at 20:53












  • 5




    Have you found a way to read the data in the original zip file?
    – ctrl-alt-delor
    Dec 18 at 20:24










  • @ctrl-alt-delor yes I didn't forget my password, I realised this by accident
    – lamino
    Dec 18 at 20:40






  • 16




    Sorry I meant, Have you found a way to read the data in the original zip file, without knowing the password?
    – ctrl-alt-delor
    Dec 18 at 20:53







5




5




Have you found a way to read the data in the original zip file?
– ctrl-alt-delor
Dec 18 at 20:24




Have you found a way to read the data in the original zip file?
– ctrl-alt-delor
Dec 18 at 20:24












@ctrl-alt-delor yes I didn't forget my password, I realised this by accident
– lamino
Dec 18 at 20:40




@ctrl-alt-delor yes I didn't forget my password, I realised this by accident
– lamino
Dec 18 at 20:40




16




16




Sorry I meant, Have you found a way to read the data in the original zip file, without knowing the password?
– ctrl-alt-delor
Dec 18 at 20:53




Sorry I meant, Have you found a way to read the data in the original zip file, without knowing the password?
– ctrl-alt-delor
Dec 18 at 20:53










1 Answer
1






active

oldest

votes


















39














Zip archives can have multiple passwords for different contained files. Files within an archive are essentially independent of each other - they are compressed without regard for other files, and they are encrypted in the same fashion. Your encrypted.zip will have two (or more) encrypted segments, one with your original password and one with the new one.



Trying to unzip the file would prompt for both passwords:



$ unzip ../test.zip
Archive: ../test.zip
[../test.zip] file1 password:
inflating: file1
inflating: file2
[../test.zip] newfile password:
inflating: newfile


The directory, the listing of file names, is not encrypted. This is not a bug, though it can be confusing and not all zip tools handle the situation well (particularly graphical tools).






share|improve this answer
















  • 2




    Counter-intuitive but Interesting feature. Thanks for clarifying
    – lamino
    Dec 18 at 20:10






  • 14




    The directory, the listing of file names, is not encrypted - this is why situations where the directory listing is also sensitive often have the original files zipped unencrypted into a zip file, which is then zipped and encrypted into another zip file. Then the only thing that is visible without the password is the name of the inner zip file.
    – Stobor
    Dec 19 at 5:40






  • 2




    @Stobor on a related note, the .7z archive format has the option to encrypt the directory listing as well as the files.
    – user3490
    Dec 19 at 18:56










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1 Answer
1






active

oldest

votes








1 Answer
1






active

oldest

votes









active

oldest

votes






active

oldest

votes









39














Zip archives can have multiple passwords for different contained files. Files within an archive are essentially independent of each other - they are compressed without regard for other files, and they are encrypted in the same fashion. Your encrypted.zip will have two (or more) encrypted segments, one with your original password and one with the new one.



Trying to unzip the file would prompt for both passwords:



$ unzip ../test.zip
Archive: ../test.zip
[../test.zip] file1 password:
inflating: file1
inflating: file2
[../test.zip] newfile password:
inflating: newfile


The directory, the listing of file names, is not encrypted. This is not a bug, though it can be confusing and not all zip tools handle the situation well (particularly graphical tools).






share|improve this answer
















  • 2




    Counter-intuitive but Interesting feature. Thanks for clarifying
    – lamino
    Dec 18 at 20:10






  • 14




    The directory, the listing of file names, is not encrypted - this is why situations where the directory listing is also sensitive often have the original files zipped unencrypted into a zip file, which is then zipped and encrypted into another zip file. Then the only thing that is visible without the password is the name of the inner zip file.
    – Stobor
    Dec 19 at 5:40






  • 2




    @Stobor on a related note, the .7z archive format has the option to encrypt the directory listing as well as the files.
    – user3490
    Dec 19 at 18:56















39














Zip archives can have multiple passwords for different contained files. Files within an archive are essentially independent of each other - they are compressed without regard for other files, and they are encrypted in the same fashion. Your encrypted.zip will have two (or more) encrypted segments, one with your original password and one with the new one.



Trying to unzip the file would prompt for both passwords:



$ unzip ../test.zip
Archive: ../test.zip
[../test.zip] file1 password:
inflating: file1
inflating: file2
[../test.zip] newfile password:
inflating: newfile


The directory, the listing of file names, is not encrypted. This is not a bug, though it can be confusing and not all zip tools handle the situation well (particularly graphical tools).






share|improve this answer
















  • 2




    Counter-intuitive but Interesting feature. Thanks for clarifying
    – lamino
    Dec 18 at 20:10






  • 14




    The directory, the listing of file names, is not encrypted - this is why situations where the directory listing is also sensitive often have the original files zipped unencrypted into a zip file, which is then zipped and encrypted into another zip file. Then the only thing that is visible without the password is the name of the inner zip file.
    – Stobor
    Dec 19 at 5:40






  • 2




    @Stobor on a related note, the .7z archive format has the option to encrypt the directory listing as well as the files.
    – user3490
    Dec 19 at 18:56













39












39








39






Zip archives can have multiple passwords for different contained files. Files within an archive are essentially independent of each other - they are compressed without regard for other files, and they are encrypted in the same fashion. Your encrypted.zip will have two (or more) encrypted segments, one with your original password and one with the new one.



Trying to unzip the file would prompt for both passwords:



$ unzip ../test.zip
Archive: ../test.zip
[../test.zip] file1 password:
inflating: file1
inflating: file2
[../test.zip] newfile password:
inflating: newfile


The directory, the listing of file names, is not encrypted. This is not a bug, though it can be confusing and not all zip tools handle the situation well (particularly graphical tools).






share|improve this answer












Zip archives can have multiple passwords for different contained files. Files within an archive are essentially independent of each other - they are compressed without regard for other files, and they are encrypted in the same fashion. Your encrypted.zip will have two (or more) encrypted segments, one with your original password and one with the new one.



Trying to unzip the file would prompt for both passwords:



$ unzip ../test.zip
Archive: ../test.zip
[../test.zip] file1 password:
inflating: file1
inflating: file2
[../test.zip] newfile password:
inflating: newfile


The directory, the listing of file names, is not encrypted. This is not a bug, though it can be confusing and not all zip tools handle the situation well (particularly graphical tools).







share|improve this answer












share|improve this answer



share|improve this answer










answered Dec 18 at 20:00









Michael Homer

45.6k8121160




45.6k8121160







  • 2




    Counter-intuitive but Interesting feature. Thanks for clarifying
    – lamino
    Dec 18 at 20:10






  • 14




    The directory, the listing of file names, is not encrypted - this is why situations where the directory listing is also sensitive often have the original files zipped unencrypted into a zip file, which is then zipped and encrypted into another zip file. Then the only thing that is visible without the password is the name of the inner zip file.
    – Stobor
    Dec 19 at 5:40






  • 2




    @Stobor on a related note, the .7z archive format has the option to encrypt the directory listing as well as the files.
    – user3490
    Dec 19 at 18:56












  • 2




    Counter-intuitive but Interesting feature. Thanks for clarifying
    – lamino
    Dec 18 at 20:10






  • 14




    The directory, the listing of file names, is not encrypted - this is why situations where the directory listing is also sensitive often have the original files zipped unencrypted into a zip file, which is then zipped and encrypted into another zip file. Then the only thing that is visible without the password is the name of the inner zip file.
    – Stobor
    Dec 19 at 5:40






  • 2




    @Stobor on a related note, the .7z archive format has the option to encrypt the directory listing as well as the files.
    – user3490
    Dec 19 at 18:56







2




2




Counter-intuitive but Interesting feature. Thanks for clarifying
– lamino
Dec 18 at 20:10




Counter-intuitive but Interesting feature. Thanks for clarifying
– lamino
Dec 18 at 20:10




14




14




The directory, the listing of file names, is not encrypted - this is why situations where the directory listing is also sensitive often have the original files zipped unencrypted into a zip file, which is then zipped and encrypted into another zip file. Then the only thing that is visible without the password is the name of the inner zip file.
– Stobor
Dec 19 at 5:40




The directory, the listing of file names, is not encrypted - this is why situations where the directory listing is also sensitive often have the original files zipped unencrypted into a zip file, which is then zipped and encrypted into another zip file. Then the only thing that is visible without the password is the name of the inner zip file.
– Stobor
Dec 19 at 5:40




2




2




@Stobor on a related note, the .7z archive format has the option to encrypt the directory listing as well as the files.
– user3490
Dec 19 at 18:56




@Stobor on a related note, the .7z archive format has the option to encrypt the directory listing as well as the files.
– user3490
Dec 19 at 18:56

















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