what you don't know can hurt you
Home Files News &[SERVICES_TAB]About Contact Add New

Glibc Character Conversion Assertion

Glibc Character Conversion Assertion
Posted Jan 29, 2021
Authored by Tavis Ormandy, Google Security Research

If an application uses iconv() with an attacker specified character set, there's an assertion in the gconv buffer management code that can be triggered, crashing the application. The crash only occurs with ISO-2022-JP-3 encoding.

tags | advisory
SHA-256 | c6a21c4fe097d825b800e707fc854c169f367c24e1653ab4813d566b22024d97

Glibc Character Conversion Assertion

Change Mirror Download
glibc: assertion during character conversion

[I'm just creating a bug for future reference, I've already reported this issue upstream and it's already been fixed]

If an application uses iconv() with an attacker specified character set, there's an assertion in the gconv buffer management code that can be triggered, crashing the application. The crash only occurs with ISO-2022-JP-3 encoding.

This is a problem because that's a really common thing to do, for example mail clients do automatic charset conversion when they see a Subject like:

Subject: =?ISO-2022-JP-3?B?.....

or a MIME header like this:

Content-Type: text/plain; charset=ISO-2022-JP-3

This would mean your mail client would immediately crash.

Upstream bug and patch is available here: https://sourceware.org/bugzilla/show_bug.cgi?id=27256

There's a testcase in the patch if you want to reproduce it.




Found by: taviso@google.com

Login or Register to add favorites

File Archive:

March 2024

  • Su
  • Mo
  • Tu
  • We
  • Th
  • Fr
  • Sa
  • 1
    Mar 1st
    16 Files
  • 2
    Mar 2nd
    0 Files
  • 3
    Mar 3rd
    0 Files
  • 4
    Mar 4th
    32 Files
  • 5
    Mar 5th
    28 Files
  • 6
    Mar 6th
    42 Files
  • 7
    Mar 7th
    17 Files
  • 8
    Mar 8th
    13 Files
  • 9
    Mar 9th
    0 Files
  • 10
    Mar 10th
    0 Files
  • 11
    Mar 11th
    15 Files
  • 12
    Mar 12th
    19 Files
  • 13
    Mar 13th
    21 Files
  • 14
    Mar 14th
    38 Files
  • 15
    Mar 15th
    15 Files
  • 16
    Mar 16th
    0 Files
  • 17
    Mar 17th
    0 Files
  • 18
    Mar 18th
    10 Files
  • 19
    Mar 19th
    32 Files
  • 20
    Mar 20th
    46 Files
  • 21
    Mar 21st
    16 Files
  • 22
    Mar 22nd
    13 Files
  • 23
    Mar 23rd
    0 Files
  • 24
    Mar 24th
    0 Files
  • 25
    Mar 25th
    12 Files
  • 26
    Mar 26th
    31 Files
  • 27
    Mar 27th
    19 Files
  • 28
    Mar 28th
    42 Files
  • 29
    Mar 29th
    0 Files
  • 30
    Mar 30th
    0 Files
  • 31
    Mar 31st
    0 Files

Top Authors In Last 30 Days

File Tags

Systems

packet storm

© 2022 Packet Storm. All rights reserved.

Services
Security Services
Hosting By
Rokasec
close