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* gnu/packages/patches/pam-krb5-CVE-2020-10595.patch: New file. * gnu/local.mk (dist_patch_DATA): Add it. * gnu/packages/admin.scm (pam-krb5)[source]: Use it.
42 lines
1.4 KiB
Diff
42 lines
1.4 KiB
Diff
Fix CVE-2020-10595:
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https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-10595
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Patch copied from upstream advisory:
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https://seclists.org/oss-sec/2020/q1/128
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diff --git a/prompting.c b/prompting.c
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index e985d95..d81054f 100644
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--- a/prompting.c
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+++ b/prompting.c
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@@ -314,26 +314,27 @@ pamk5_prompter_krb5(krb5_context context UNUSED, void *data, const char *name,
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/*
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* Reuse pam_prompts as a starting index and copy the data into the reply
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* area of the krb5_prompt structs.
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*/
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pam_prompts = 0;
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if (name != NULL && !args->silent)
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pam_prompts++;
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if (banner != NULL && !args->silent)
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pam_prompts++;
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for (i = 0; i < num_prompts; i++, pam_prompts++) {
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- size_t len;
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+ size_t len, allowed;
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if (resp[pam_prompts].resp == NULL)
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goto cleanup;
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len = strlen(resp[pam_prompts].resp);
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- if (len > prompts[i].reply->length)
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+ allowed = prompts[i].reply->length;
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+ if (allowed == 0 || len > allowed - 1)
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goto cleanup;
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/*
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* The trailing nul is not included in length, but other applications
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* expect it to be there. Therefore, we copy one more byte than the
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* actual length of the password, but set length to just the length of
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* the password.
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*/
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memcpy(prompts[i].reply->data, resp[pam_prompts].resp, len + 1);
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prompts[i].reply->length = (unsigned int) len;
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