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Bug#: 83541
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Status: RESOLVED
Resolution: FIXED
Assigned To: Gentoo Security <security@gentoo.org>
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Reporter: Tavis Ormandy (RETIRED) <taviso@gentoo.org>
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Filename Description Type Creator Created Size Actions
hashcash-1.16-format-string.diff hashcash patch patch Tavis Ormandy (RETIRED) 2005-03-01 02:16 0000 382 bytes Details | Diff
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Bug 83541 depends on: Show dependency tree
Bug 83541 blocks:

Additional Comments: (this is where you put emerge --info)


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Description:   Opened: 2005-02-28 04:46 0000 
hashcash-1.16 has a format string bug when printing the header, It could be
possible to execute code in certain circumstances, but I havnt proved this.

At the very least it's a DoS by preventing hashcash users from participating in
discussions or dirupting logs/exhausting memory by using huge field widths, eg

hashcash -qm -b 8 -r "foo%.5000000x" -X < /dev/null

I reported this to the hashcash mailing list (see URL).

Reproducible: Always
Steps to Reproduce:
1.
2.
3.

------- Comment #1 From Tavis Ormandy (RETIRED) 2005-03-01 02:16:08 0000 ------- 
Created an attachment (id=52362) [details]
hashcash patch

obviously correct oneliner for format string vulnerability.

------- Comment #2 From Bryan Østergaard (RETIRED) 2005-03-02 11:41:19 0000 ------- 
hashcash-1.16-r1 committed - thanks for the patch :)

------- Comment #3 From Thierry Carrez (RETIRED) 2005-03-02 11:50:28 0000 ------- 
x86: please test and mark stable

------- Comment #4 From Olivier Crete 2005-03-05 21:53:17 0000 ------- 
x86 was already there

------- Comment #5 From Thierry Carrez (RETIRED) 2005-03-06 05:17:55 0000 ------- 
GLSA 200503-12
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